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- /* Job execution and handling for GNU Make.
- Copyright (C) 1988,89,90,91,92,93,94,95,96,97 Free Software Foundation, Inc.
- This file is part of GNU Make.
-
- GNU Make is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GNU Make is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU Make; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "make.h"
- #include "job.h"
- #include "filedef.h"
- #include "commands.h"
- #include "variable.h"
- #include <assert.h>
-
- /* Default shell to use. */
- #ifdef WINDOWS32
- char *default_shell = "sh.exe";
- int no_default_sh_exe = 1;
- #else /* WINDOWS32 */
- #ifdef _AMIGA
- char default_shell[] = "";
- extern int MyExecute (char **);
- #else
- #ifdef __MSDOS__
- /* The default shell is a pointer so we can change it if Makefile
- says so. It is without an explicit path so we get a chance
- to search the $PATH for it (since MSDOS doesn't have standard
- directories we could trust). */
- char *default_shell = "command.com";
- #else /* __MSDOS__ */
- char default_shell[] = "/bin/sh";
- #endif /* __MSDOS__ */
- #endif /* _AMIGA */
- #endif /* WINDOWS32 */
-
- #ifdef __MSDOS__
- #include <process.h>
- static int execute_by_shell;
- static int dos_pid = 123;
- int dos_status;
- int dos_command_running;
- #endif /* __MSDOS__ */
-
- #ifdef _AMIGA
- #include <proto/dos.h>
- static int amiga_pid = 123;
- static int amiga_status;
- static char amiga_bname[32];
- static int amiga_batch_file;
- #endif /* Amiga. */
-
- #ifdef VMS
- #include <time.h>
- #include <processes.h>
- #include <starlet.h>
- #include <lib$routines.h>
- #endif
-
- #ifdef WINDOWS32
- #include <windows.h>
- #include <io.h>
- #include <process.h>
- #include "sub_proc.h"
- #include "w32err.h"
- #include "pathstuff.h"
-
- /* this stuff used if no sh.exe is around */
- static char *dos_bname;
- static char *dos_bename;
- static int dos_batch_file;
- #endif /* WINDOWS32 */
-
- #ifdef HAVE_FCNTL_H
- #include <fcntl.h>
- #else
- #include <sys/file.h>
- #endif
-
- #if defined (HAVE_SYS_WAIT_H) || defined (HAVE_UNION_WAIT)
- #include <sys/wait.h>
- #endif
-
- #ifdef HAVE_WAITPID
- #define WAIT_NOHANG(status) waitpid (-1, (status), WNOHANG)
- #else /* Don't have waitpid. */
- #ifdef HAVE_WAIT3
- #ifndef wait3
- extern int wait3 ();
- #endif
- #define WAIT_NOHANG(status) wait3 ((status), WNOHANG, (struct rusage *) 0)
- #endif /* Have wait3. */
- #endif /* Have waitpid. */
-
- #if !defined (wait) && !defined (POSIX)
- extern int wait ();
- #endif
-
- #ifndef HAVE_UNION_WAIT
-
- #define WAIT_T int
-
- #ifndef WTERMSIG
- #define WTERMSIG(x) ((x) & 0x7f)
- #endif
- #ifndef WCOREDUMP
- #define WCOREDUMP(x) ((x) & 0x80)
- #endif
- #ifndef WEXITSTATUS
- #define WEXITSTATUS(x) (((x) >> 8) & 0xff)
- #endif
- #ifndef WIFSIGNALED
- #define WIFSIGNALED(x) (WTERMSIG (x) != 0)
- #endif
- #ifndef WIFEXITED
- #define WIFEXITED(x) (WTERMSIG (x) == 0)
- #endif
-
- #else /* Have `union wait'. */
-
- #define WAIT_T union wait
- #ifndef WTERMSIG
- #define WTERMSIG(x) ((x).w_termsig)
- #endif
- #ifndef WCOREDUMP
- #define WCOREDUMP(x) ((x).w_coredump)
- #endif
- #ifndef WEXITSTATUS
- #define WEXITSTATUS(x) ((x).w_retcode)
- #endif
- #ifndef WIFSIGNALED
- #define WIFSIGNALED(x) (WTERMSIG(x) != 0)
- #endif
- #ifndef WIFEXITED
- #define WIFEXITED(x) (WTERMSIG(x) == 0)
- #endif
-
- #endif /* Don't have `union wait'. */
-
- #ifdef VMS
- static int vms_jobsefnmask=0;
- #endif /* !VMS */
-
- #ifndef HAVE_UNISTD_H
- extern int dup2 ();
- extern int execve ();
- extern void _exit ();
- #ifndef VMS
- extern int geteuid ();
- extern int getegid ();
- extern int setgid ();
- extern int getgid ();
- #endif
- #endif
-
- extern char *allocated_variable_expand_for_file PARAMS ((char *line, struct file *file));
-
- extern int getloadavg PARAMS ((double loadavg[], int nelem));
- extern int start_remote_job PARAMS ((char **argv, char **envp, int stdin_fd,
- int *is_remote, int *id_ptr, int *used_stdin));
- extern int start_remote_job_p PARAMS ((void));
- extern int remote_status PARAMS ((int *exit_code_ptr, int *signal_ptr,
- int *coredump_ptr, int block));
-
- RETSIGTYPE child_handler PARAMS ((int));
- static void free_child PARAMS ((struct child *));
- static void start_job_command PARAMS ((struct child *child));
- static int load_too_high PARAMS ((void));
- static int job_next_command PARAMS ((struct child *));
- static int start_waiting_job PARAMS ((struct child *));
- #ifdef VMS
- static void vmsWaitForChildren PARAMS ((int *));
- #endif
-
- /* Chain of all live (or recently deceased) children. */
-
- struct child *children = 0;
-
- /* Number of children currently running. */
-
- unsigned int job_slots_used = 0;
-
- /* Nonzero if the `good' standard input is in use. */
-
- static int good_stdin_used = 0;
-
- /* Chain of children waiting to run until the load average goes down. */
-
- static struct child *waiting_jobs = 0;
-
- /* Non-zero if we use a *real* shell (always so on Unix). */
-
- int unixy_shell = 1;
-
- #ifdef WINDOWS32
- /*
- * The macro which references this function is defined in make.h.
- */
- int w32_kill(int pid, int sig)
- {
- return ((process_kill(pid, sig) == TRUE) ? 0 : -1);
- }
- #endif /* WINDOWS32 */
-
- /* Write an error message describing the exit status given in
- EXIT_CODE, EXIT_SIG, and COREDUMP, for the target TARGET_NAME.
- Append "(ignored)" if IGNORED is nonzero. */
-
- static void
- child_error (target_name, exit_code, exit_sig, coredump, ignored)
- char *target_name;
- int exit_code, exit_sig, coredump;
- int ignored;
- {
- if (ignored && silent_flag)
- return;
-
- #ifdef VMS
- if (!(exit_code & 1))
- error("*** [%s] Error 0x%x%s", target_name, exit_code, ((ignored)? " (ignored)" : ""));
- #else
- if (exit_sig == 0)
- error (ignored ? "[%s] Error %d (ignored)" :
- "*** [%s] Error %d",
- target_name, exit_code);
- else
- error ("*** [%s] %s%s",
- target_name, strsignal (exit_sig),
- coredump ? " (core dumped)" : "");
- #endif /* VMS */
- }
-
- static unsigned int dead_children = 0;
-
- #ifdef VMS
- /* Wait for nchildren children to terminate */
- static void
- vmsWaitForChildren(int *status)
- {
- while (1)
- {
- if (!vms_jobsefnmask)
- {
- *status = 0;
- return;
- }
-
- *status = sys$wflor (32, vms_jobsefnmask);
- }
- return;
- }
- #endif
-
-
- /* Notice that a child died.
- reap_children should be called when convenient. */
- RETSIGTYPE
- child_handler (sig)
- int sig;
- {
- ++dead_children;
-
- if (debug_flag)
- printf ("Got a SIGCHLD; %d unreaped children.\n", dead_children);
- }
-
- extern int shell_function_pid, shell_function_completed;
-
- /* Reap dead children, storing the returned status and the new command
- state (`cs_finished') in the `file' member of the `struct child' for the
- dead child, and removing the child from the chain. If BLOCK nonzero,
- reap at least one child, waiting for it to die if necessary. If ERR is
- nonzero, print an error message first. */
-
- void
- reap_children (block, err)
- int block, err;
- {
- WAIT_T status;
-
- while ((children != 0 || shell_function_pid != 0) &&
- (block || dead_children > 0))
- {
- int remote = 0;
- register int pid;
- int exit_code, exit_sig, coredump;
- register struct child *lastc, *c;
- int child_failed;
- int any_remote, any_local;
-
- if (err && dead_children == 0)
- {
- /* We might block for a while, so let the user know why. */
- fflush (stdout);
- error ("*** Waiting for unfinished jobs....");
- }
-
- /* We have one less dead child to reap.
- The test and decrement are not atomic; if it is compiled into:
- register = dead_children - 1;
- dead_children = register;
- a SIGCHLD could come between the two instructions.
- child_handler increments dead_children.
- The second instruction here would lose that increment. But the
- only effect of dead_children being wrong is that we might wait
- longer than necessary to reap a child, and lose some parallelism;
- and we might print the "Waiting for unfinished jobs" message above
- when not necessary. */
-
- if (dead_children > 0)
- --dead_children;
-
- any_remote = 0;
- any_local = shell_function_pid != 0;
- for (c = children; c != 0; c = c->next)
- {
- any_remote |= c->remote;
- any_local |= ! c->remote;
- if (debug_flag)
- printf ("Live child 0x%08lx PID %d%s\n",
- (unsigned long int) c,
- c->pid, c->remote ? " (remote)" : "");
- #ifdef VMS
- break;
- #endif
- }
-
- /* First, check for remote children. */
- if (any_remote)
- pid = remote_status (&exit_code, &exit_sig, &coredump, 0);
- else
- pid = 0;
-
- if (pid < 0)
- {
- remote_status_lose:
- #ifdef EINTR
- if (errno == EINTR)
- continue;
- #endif
- pfatal_with_name ("remote_status");
- }
- else if (pid == 0)
- {
- #if !defined(__MSDOS__) && !defined(_AMIGA) && !defined(WINDOWS32)
- /* No remote children. Check for local children. */
-
- if (any_local)
- {
- #ifdef VMS
- vmsWaitForChildren (&status);
- pid = c->pid;
- #else
- #ifdef WAIT_NOHANG
- if (!block)
- pid = WAIT_NOHANG (&status);
- else
- #endif
- pid = wait (&status);
- #endif /* !VMS */
- }
- else
- pid = 0;
-
- if (pid < 0)
- {
- #ifdef EINTR
- if (errno == EINTR)
- continue;
- #endif
- pfatal_with_name ("wait");
- }
- else if (pid == 0)
- {
- /* No local children. */
- if (block && any_remote)
- {
- /* Now try a blocking wait for a remote child. */
- pid = remote_status (&exit_code, &exit_sig, &coredump, 1);
- if (pid < 0)
- goto remote_status_lose;
- else if (pid == 0)
- /* No remote children either. Finally give up. */
- break;
- else
- /* We got a remote child. */
- remote = 1;
- }
- else
- break;
- }
- else
- {
- /* Chop the status word up. */
- exit_code = WEXITSTATUS (status);
- exit_sig = WIFSIGNALED (status) ? WTERMSIG (status) : 0;
- coredump = WCOREDUMP (status);
- }
- #else /* __MSDOS__, Amiga, WINDOWS32. */
- #ifdef __MSDOS__
- /* Life is very different on MSDOS. */
- pid = dos_pid - 1;
- status = dos_status;
- exit_code = WEXITSTATUS (status);
- if (exit_code == 0xff)
- exit_code = -1;
- exit_sig = WIFSIGNALED (status) ? WTERMSIG (status) : 0;
- coredump = 0;
- #endif /* __MSDOS__ */
- #ifdef _AMIGA
- /* Same on Amiga */
- pid = amiga_pid - 1;
- status = amiga_status;
- exit_code = amiga_status;
- exit_sig = 0;
- coredump = 0;
- #endif /* _AMIGA */
- #ifdef WINDOWS32
- {
- HANDLE hPID;
- int err;
-
- /* wait for anything to finish */
- if (hPID = process_wait_for_any()) {
-
- /* was an error found on this process? */
- err = process_last_err(hPID);
-
- /* get exit data */
- exit_code = process_exit_code(hPID);
-
- if (err)
- fprintf(stderr, "make (e=%d): %s",
- exit_code, map_windows32_error_to_string(exit_code));
-
- exit_sig = process_signal(hPID);
-
- /* cleanup process */
- process_cleanup(hPID);
-
- if (dos_batch_file) {
- remove (dos_bname);
- remove (dos_bename);
- dos_batch_file = 0;
- }
-
- coredump = 0;
- }
- pid = (int) hPID;
- }
- #endif /* WINDOWS32 */
- #endif /* Not __MSDOS__ */
- }
- else
- /* We got a remote child. */
- remote = 1;
-
- /* Check if this is the child of the `shell' function. */
- if (!remote && pid == shell_function_pid)
- {
- /* It is. Leave an indicator for the `shell' function. */
- if (exit_sig == 0 && exit_code == 127)
- shell_function_completed = -1;
- else
- shell_function_completed = 1;
- break;
- }
-
- child_failed = exit_sig != 0 || exit_code != 0;
-
- /* Search for a child matching the deceased one. */
- lastc = 0;
- for (c = children; c != 0; lastc = c, c = c->next)
- if (c->remote == remote && c->pid == pid)
- break;
-
- if (c == 0)
- {
- /* An unknown child died. */
- char buf[100];
- sprintf (buf, "Unknown%s job %d", remote ? " remote" : "", pid);
- if (child_failed)
- child_error (buf, exit_code, exit_sig, coredump,
- ignore_errors_flag);
- else
- error ("%s finished.", buf);
- }
- else
- {
- if (debug_flag)
- printf ("Reaping %s child 0x%08lx PID %d%s\n",
- child_failed ? "losing" : "winning",
- (unsigned long int) c,
- c->pid, c->remote ? " (remote)" : "");
-
- /* If this child had the good stdin, say it is now free. */
- if (c->good_stdin)
- good_stdin_used = 0;
-
- if (child_failed && !c->noerror && !ignore_errors_flag)
- {
- /* The commands failed. Write an error message,
- delete non-precious targets, and abort. */
- static int delete_on_error = -1;
- child_error (c->file->name, exit_code, exit_sig, coredump, 0);
- c->file->update_status = 2;
- if (delete_on_error == -1)
- {
- struct file *f = lookup_file (".DELETE_ON_ERROR");
- delete_on_error = f != 0 && f->is_target;
- }
- if (exit_sig != 0 || delete_on_error)
- delete_child_targets (c);
- }
- else
- {
- if (child_failed)
- {
- /* The commands failed, but we don't care. */
- child_error (c->file->name,
- exit_code, exit_sig, coredump, 1);
- child_failed = 0;
- }
-
- /* If there are more commands to run, try to start them. */
- if (job_next_command (c))
- {
- if (handling_fatal_signal)
- {
- /* Never start new commands while we are dying.
- Since there are more commands that wanted to be run,
- the target was not completely remade. So we treat
- this as if a command had failed. */
- c->file->update_status = 2;
- }
- else
- {
- /* Check again whether to start remotely.
- Whether or not we want to changes over time.
- Also, start_remote_job may need state set up
- by start_remote_job_p. */
- c->remote = start_remote_job_p ();
- start_job_command (c);
- /* Fatal signals are left blocked in case we were
- about to put that child on the chain. But it is
- already there, so it is safe for a fatal signal to
- arrive now; it will clean up this child's targets. */
- unblock_sigs ();
- if (c->file->command_state == cs_running)
- /* We successfully started the new command.
- Loop to reap more children. */
- continue;
- }
-
- if (c->file->update_status != 0)
- /* We failed to start the commands. */
- delete_child_targets (c);
- }
- else
- /* There are no more commands. We got through them all
- without an unignored error. Now the target has been
- successfully updated. */
- c->file->update_status = 0;
- }
-
- /* When we get here, all the commands for C->file are finished
- (or aborted) and C->file->update_status contains 0 or 2. But
- C->file->command_state is still cs_running if all the commands
- ran; notice_finish_file looks for cs_running to tell it that
- it's interesting to check the file's modtime again now. */
-
- if (! handling_fatal_signal)
- /* Notice if the target of the commands has been changed.
- This also propagates its values for command_state and
- update_status to its also_make files. */
- notice_finished_file (c->file);
-
- if (debug_flag)
- printf ("Removing child 0x%08lx PID %d%s from chain.\n",
- (unsigned long int) c,
- c->pid, c->remote ? " (remote)" : "");
-
- /* Block fatal signals while frobnicating the list, so that
- children and job_slots_used are always consistent. Otherwise
- a fatal signal arriving after the child is off the chain and
- before job_slots_used is decremented would believe a child was
- live and call reap_children again. */
- block_sigs ();
-
- /* Remove the child from the chain and free it. */
- if (lastc == 0)
- children = c->next;
- else
- lastc->next = c->next;
- if (! handling_fatal_signal) /* Don't bother if about to die. */
- free_child (c);
-
- /* There is now another slot open. */
- if (job_slots_used > 0)
- --job_slots_used;
-
- unblock_sigs ();
-
- /* If the job failed, and the -k flag was not given, die,
- unless we are already in the process of dying. */
- if (!err && child_failed && !keep_going_flag &&
- /* fatal_error_signal will die with the right signal. */
- !handling_fatal_signal)
- die (2);
- }
-
- /* Only block for one child. */
- block = 0;
- }
- return;
- }
-
- /* Free the storage allocated for CHILD. */
-
- static void
- free_child (child)
- register struct child *child;
- {
- if (child->command_lines != 0)
- {
- register unsigned int i;
- for (i = 0; i < child->file->cmds->ncommand_lines; ++i)
- free (child->command_lines[i]);
- free ((char *) child->command_lines);
- }
-
- if (child->environment != 0)
- {
- register char **ep = child->environment;
- while (*ep != 0)
- free (*ep++);
- free ((char *) child->environment);
- }
-
- free ((char *) child);
- }
-
- #ifdef POSIX
- extern sigset_t fatal_signal_set;
- #endif
-
- void
- block_sigs ()
- {
- #ifdef POSIX
- (void) sigprocmask (SIG_BLOCK, &fatal_signal_set, (sigset_t *) 0);
- #else
- #ifdef HAVE_SIGSETMASK
- (void) sigblock (fatal_signal_mask);
- #endif
- #endif
- }
-
- #ifdef POSIX
- void
- unblock_sigs ()
- {
- sigset_t empty;
- sigemptyset (&empty);
- sigprocmask (SIG_SETMASK, &empty, (sigset_t *) 0);
- }
- #endif
-
- /* Start a job to run the commands specified in CHILD.
- CHILD is updated to reflect the commands and ID of the child process.
-
- NOTE: On return fatal signals are blocked! The caller is responsible
- for calling `unblock_sigs', once the new child is safely on the chain so
- it can be cleaned up in the event of a fatal signal. */
-
- static void
- start_job_command (child)
- register struct child *child;
- {
- #ifndef _AMIGA
- static int bad_stdin = -1;
- #endif
- register char *p;
- int flags;
- #ifdef VMS
- char *argv;
- #else
- char **argv;
- #endif
-
- /* Combine the flags parsed for the line itself with
- the flags specified globally for this target. */
- flags = (child->file->command_flags
- | child->file->cmds->lines_flags[child->command_line - 1]);
-
- p = child->command_ptr;
- child->noerror = flags & COMMANDS_NOERROR;
-
- while (*p != '\0')
- {
- if (*p == '@')
- flags |= COMMANDS_SILENT;
- else if (*p == '+')
- flags |= COMMANDS_RECURSE;
- else if (*p == '-')
- child->noerror = 1;
- else if (!isblank (*p) && *p != '+')
- break;
- ++p;
- }
-
- /* If -q was given, just say that updating `failed'. The exit status of
- 1 tells the user that -q is saying `something to do'; the exit status
- for a random error is 2. */
- if (question_flag && !(flags & COMMANDS_RECURSE))
- {
- child->file->update_status = 1;
- notice_finished_file (child->file);
- return;
- }
-
- /* There may be some preceding whitespace left if there
- was nothing but a backslash on the first line. */
- p = next_token (p);
-
- /* Figure out an argument list from this command line. */
-
- {
- char *end = 0;
- #ifdef VMS
- argv = p;
- #else
- argv = construct_command_argv (p, &end, child->file);
- #endif
- if (end == NULL)
- child->command_ptr = NULL;
- else
- {
- *end++ = '\0';
- child->command_ptr = end;
- }
- }
-
- if (touch_flag && !(flags & COMMANDS_RECURSE))
- {
- /* Go on to the next command. It might be the recursive one.
- We construct ARGV only to find the end of the command line. */
- #ifndef VMS
- free (argv[0]);
- free ((char *) argv);
- #endif
- argv = 0;
- }
-
- if (argv == 0)
- {
- next_command:
- /* This line has no commands. Go to the next. */
- if (job_next_command (child))
- start_job_command (child);
- else
- {
- /* No more commands. All done. */
- child->file->update_status = 0;
- notice_finished_file (child->file);
- }
- return;
- }
-
- /* Print out the command. If silent, we call `message' with null so it
- can log the working directory before the command's own error messages
- appear. */
-
- message (0, (just_print_flag || (!(flags & COMMANDS_SILENT) && !silent_flag))
- ? "%s" : (char *) 0, p);
-
- /* Optimize an empty command. People use this for timestamp rules,
- and forking a useless shell all the time leads to inefficiency. */
-
- #if !defined(VMS) && !defined(_AMIGA)
- if (
- #ifdef __MSDOS__
- unixy_shell /* the test is complicated and we already did it */
- #else
- (argv[0] && !strcmp(argv[0], "/bin/sh"))
- #endif
- && (argv[1] && !strcmp(argv[1], "-c"))
- && (argv[2] && !strcmp(argv[2], ":"))
- && argv[3] == NULL)
- {
- set_command_state (child->file, cs_running);
- goto next_command;
- }
- #endif /* !VMS && !_AMIGA */
-
- /* Tell update_goal_chain that a command has been started on behalf of
- this target. It is important that this happens here and not in
- reap_children (where we used to do it), because reap_children might be
- reaping children from a different target. We want this increment to
- guaranteedly indicate that a command was started for the dependency
- chain (i.e., update_file recursion chain) we are processing. */
-
- ++commands_started;
-
- /* If -n was given, recurse to get the next line in the sequence. */
-
- if (just_print_flag && !(flags & COMMANDS_RECURSE))
- {
- #ifndef VMS
- free (argv[0]);
- free ((char *) argv);
- #endif
- goto next_command;
- }
-
- /* Flush the output streams so they won't have things written twice. */
-
- fflush (stdout);
- fflush (stderr);
-
- #ifndef VMS
- #if !defined(WINDOWS32) && !defined(_AMIGA) && !defined(__MSDOS__)
-
- /* Set up a bad standard input that reads from a broken pipe. */
-
- if (bad_stdin == -1)
- {
- /* Make a file descriptor that is the read end of a broken pipe.
- This will be used for some children's standard inputs. */
- int pd[2];
- if (pipe (pd) == 0)
- {
- /* Close the write side. */
- (void) close (pd[1]);
- /* Save the read side. */
- bad_stdin = pd[0];
-
- /* Set the descriptor to close on exec, so it does not litter any
- child's descriptor table. When it is dup2'd onto descriptor 0,
- that descriptor will not close on exec. */
- #ifdef FD_SETFD
- #ifndef FD_CLOEXEC
- #define FD_CLOEXEC 1
- #endif
- (void) fcntl (bad_stdin, F_SETFD, FD_CLOEXEC);
- #endif
- }
- }
-
- #endif /* !WINDOWS32 && !_AMIGA && !__MSDOS__ */
-
- /* Decide whether to give this child the `good' standard input
- (one that points to the terminal or whatever), or the `bad' one
- that points to the read side of a broken pipe. */
-
- child->good_stdin = !good_stdin_used;
- if (child->good_stdin)
- good_stdin_used = 1;
-
- #endif /* !VMS */
-
- child->deleted = 0;
-
- #ifndef _AMIGA
- /* Set up the environment for the child. */
- if (child->environment == 0)
- child->environment = target_environment (child->file);
- #endif
-
- #if !defined(__MSDOS__) && !defined(_AMIGA) && !defined(WINDOWS32)
-
- #ifndef VMS
- /* start_waiting_job has set CHILD->remote if we can start a remote job. */
- if (child->remote)
- {
- int is_remote, id, used_stdin;
- if (start_remote_job (argv, child->environment,
- child->good_stdin ? 0 : bad_stdin,
- &is_remote, &id, &used_stdin))
- goto error;
- else
- {
- if (child->good_stdin && !used_stdin)
- {
- child->good_stdin = 0;
- good_stdin_used = 0;
- }
- child->remote = is_remote;
- child->pid = id;
- }
- }
- else
- #endif /* !VMS */
- {
- /* Fork the child process. */
-
- char **parent_environ;
-
- block_sigs ();
-
- child->remote = 0;
-
- #ifdef VMS
-
- if (!child_execute_job (argv, child)) {
- /* Fork failed! */
- perror_with_name ("vfork", "");
- goto error;
- }
-
- #else
-
- parent_environ = environ;
- child->pid = vfork ();
- environ = parent_environ; /* Restore value child may have clobbered. */
- if (child->pid == 0)
- {
- /* We are the child side. */
- unblock_sigs ();
- child_execute_job (child->good_stdin ? 0 : bad_stdin, 1,
- argv, child->environment);
- }
- else if (child->pid < 0)
- {
- /* Fork failed! */
- unblock_sigs ();
- perror_with_name ("vfork", "");
- goto error;
- }
- #endif /* !VMS */
- }
-
- #else /* __MSDOS__ or Amiga or WINDOWS32 */
- #ifdef __MSDOS__
- {
- int proc_return;
-
- block_sigs ();
- dos_status = 0;
-
- /* We call `system' to do the job of the SHELL, since stock DOS
- shell is too dumb. Our `system' knows how to handle long
- command lines even if pipes/redirection is needed; it will only
- call COMMAND.COM when its internal commands are used. */
- if (execute_by_shell)
- {
- char *cmdline = argv[0];
- /* We don't have a way to pass environment to `system',
- so we need to save and restore ours, sigh... */
- char **parent_environ = environ;
-
- environ = child->environment;
-
- /* If we have a *real* shell, tell `system' to call
- it to do everything for us. */
- if (unixy_shell)
- {
- /* A *real* shell on MSDOS may not support long
- command lines the DJGPP way, so we must use `system'. */
- cmdline = argv[2]; /* get past "shell -c" */
- }
-
- dos_command_running = 1;
- proc_return = system (cmdline);
- dos_command_running = 0;
- environ = parent_environ;
- execute_by_shell = 0; /* for the next time */
- }
- else
- {
- dos_command_running = 1;
- proc_return = spawnvpe (P_WAIT, argv[0], argv, child->environment);
- dos_command_running = 0;
- }
-
- if (proc_return == -1)
- dos_status |= 0xff;
- else
- dos_status |= (proc_return & 0xff);
- ++dead_children;
- child->pid = dos_pid++;
- }
- #endif /* __MSDOS__ */
- #ifdef _AMIGA
- amiga_status = MyExecute (argv);
-
- ++dead_children;
- child->pid = amiga_pid++;
- if (amiga_batch_file)
- {
- amiga_batch_file = 0;
- DeleteFile (amiga_bname); /* Ignore errors. */
- }
- #endif /* Amiga */
- #ifdef WINDOWS32
- {
- HANDLE hPID;
- char* arg0;
-
- /* make UNC paths safe for CreateProcess -- backslash format */
- arg0 = argv[0];
- if (arg0 && arg0[0] == '/' && arg0[1] == '/')
- for ( ; arg0 && *arg0; arg0++)
- if (*arg0 == '/')
- *arg0 = '\\';
-
- /* make sure CreateProcess() has Path it needs */
- sync_Path_environment();
-
- hPID = process_easy(argv, child->environment);
-
- if (hPID != INVALID_HANDLE_VALUE)
- child->pid = (int) hPID;
- else {
- int i;
- unblock_sigs();
- fprintf(stderr,
- "process_easy() failed failed to launch process (e=%d)\n",
- process_last_err(hPID));
- for (i = 0; argv[i]; i++)
- fprintf(stderr, "%s ", argv[i]);
- fprintf(stderr, "\nCounted %d args in failed launch\n", i);
- }
- }
- #endif /* WINDOWS32 */
- #endif /* __MSDOS__ or Amiga or WINDOWS32 */
-
- /* We are the parent side. Set the state to
- say the commands are running and return. */
-
- set_command_state (child->file, cs_running);
-
- /* Free the storage used by the child's argument list. */
- #ifndef VMS
- free (argv[0]);
- free ((char *) argv);
- #endif
-
- return;
-
- error:
- child->file->update_status = 2;
- notice_finished_file (child->file);
- return;
- }
-
- /* Try to start a child running.
- Returns nonzero if the child was started (and maybe finished), or zero if
- the load was too high and the child was put on the `waiting_jobs' chain. */
-
- static int
- start_waiting_job (c)
- struct child *c;
- {
- /* If we can start a job remotely, we always want to, and don't care about
- the local load average. We record that the job should be started
- remotely in C->remote for start_job_command to test. */
-
- c->remote = start_remote_job_p ();
-
- /* If this job is to be started locally, and we are already running
- some jobs, make this one wait if the load average is too high. */
- if (!c->remote && job_slots_used > 0 && load_too_high ())
- {
- /* Put this child on the chain of children waiting
- for the load average to go down. */
- set_command_state (c->file, cs_running);
- c->next = waiting_jobs;
- waiting_jobs = c;
- return 0;
- }
-
- /* Start the first command; reap_children will run later command lines. */
- start_job_command (c);
-
- switch (c->file->command_state)
- {
- case cs_running:
- c->next = children;
- if (debug_flag)
- printf ("Putting child 0x%08lx PID %05d%s on the chain.\n",
- (unsigned long int) c,
- c->pid, c->remote ? " (remote)" : "");
- children = c;
- /* One more job slot is in use. */
- ++job_slots_used;
- unblock_sigs ();
- break;
-
- case cs_not_started:
- /* All the command lines turned out to be empty. */
- c->file->update_status = 0;
- /* FALLTHROUGH */
-
- case cs_finished:
- notice_finished_file (c->file);
- free_child (c);
- break;
-
- default:
- assert (c->file->command_state == cs_finished);
- break;
- }
-
- return 1;
- }
-
- /* Create a `struct child' for FILE and start its commands running. */
-
- void
- new_job (file)
- register struct file *file;
- {
- register struct commands *cmds = file->cmds;
- register struct child *c;
- char **lines;
- register unsigned int i;
-
- /* Let any previously decided-upon jobs that are waiting
- for the load to go down start before this new one. */
- start_waiting_jobs ();
-
- /* Reap any children that might have finished recently. */
- reap_children (0, 0);
-
- /* Chop the commands up into lines if they aren't already. */
- chop_commands (cmds);
-
- if (job_slots != 0)
- /* Wait for a job slot to be freed up. */
- while (job_slots_used == job_slots)
- reap_children (1, 0);
-
- /* Expand the command lines and store the results in LINES. */
- lines = (char **) xmalloc (cmds->ncommand_lines * sizeof (char *));
- for (i = 0; i < cmds->ncommand_lines; ++i)
- {
- /* Collapse backslash-newline combinations that are inside variable
- or function references. These are left alone by the parser so
- that they will appear in the echoing of commands (where they look
- nice); and collapsed by construct_command_argv when it tokenizes.
- But letting them survive inside function invocations loses because
- we don't want the functions to see them as part of the text. */
-
- char *in, *out, *ref;
-
- /* IN points to where in the line we are scanning.
- OUT points to where in the line we are writing.
- When we collapse a backslash-newline combination,
- IN gets ahead of OUT. */
-
- in = out = cmds->command_lines[i];
- while ((ref = index (in, '$')) != 0)
- {
- ++ref; /* Move past the $. */
-
- if (out != in)
- /* Copy the text between the end of the last chunk
- we processed (where IN points) and the new chunk
- we are about to process (where REF points). */
- bcopy (in, out, ref - in);
-
- /* Move both pointers past the boring stuff. */
- out += ref - in;
- in = ref;
-
- if (*ref == '(' || *ref == '{')
- {
- char openparen = *ref;
- char closeparen = openparen == '(' ? ')' : '}';
- int count;
- char *p;
-
- *out++ = *in++; /* Copy OPENPAREN. */
- /* IN now points past the opening paren or brace.
- Count parens or braces until it is matched. */
- count = 0;
- while (*in != '\0')
- {
- if (*in == closeparen && --count < 0)
- break;
- else if (*in == '\\' && in[1] == '\n')
- {
- /* We have found a backslash-newline inside a
- variable or function reference. Eat it and
- any following whitespace. */
-
- int quoted = 0;
- for (p = in - 1; p > ref && *p == '\\'; --p)
- quoted = !quoted;
-
- if (quoted)
- /* There were two or more backslashes, so this is
- not really a continuation line. We don't collapse
- the quoting backslashes here as is done in
- collapse_continuations, because the line will
- be collapsed again after expansion. */
- *out++ = *in++;
- else
- {
- /* Skip the backslash, newline and
- any following whitespace. */
- in = next_token (in + 2);
-
- /* Discard any preceding whitespace that has
- already been written to the output. */
- while (out > ref && isblank (out[-1]))
- --out;
-
- /* Replace it all with a single space. */
- *out++ = ' ';
- }
- }
- else
- {
- if (*in == openparen)
- ++count;
-
- *out++ = *in++;
- }
- }
- }
- }
-
- /* There are no more references in this line to worry about.
- Copy the remaining uninteresting text to the output. */
- if (out != in)
- strcpy (out, in);
-
- /* Finally, expand the line. */
- lines[i] = allocated_variable_expand_for_file (cmds->command_lines[i],
- file);
- }
-
- /* Start the command sequence, record it in a new
- `struct child', and add that to the chain. */
-
- c = (struct child *) xmalloc (sizeof (struct child));
- c->file = file;
- c->command_lines = lines;
- c->command_line = 0;
- c->command_ptr = 0;
- c->environment = 0;
-
- /* Fetch the first command line to be run. */
- job_next_command (c);
-
- /* The job is now primed. Start it running.
- (This will notice if there are in fact no commands.) */
- (void)start_waiting_job (c);
-
- if (job_slots == 1)
- /* Since there is only one job slot, make things run linearly.
- Wait for the child to die, setting the state to `cs_finished'. */
- while (file->command_state == cs_running)
- reap_children (1, 0);
-
- return;
- }
-
- /* Move CHILD's pointers to the next command for it to execute.
- Returns nonzero if there is another command. */
-
- static int
- job_next_command (child)
- struct child *child;
- {
- while (child->command_ptr == 0 || *child->command_ptr == '\0')
- {
- /* There are no more lines in the expansion of this line. */
- if (child->command_line == child->file->cmds->ncommand_lines)
- {
- /* There are no more lines to be expanded. */
- child->command_ptr = 0;
- return 0;
- }
- else
- /* Get the next line to run. */
- child->command_ptr = child->command_lines[child->command_line++];
- }
- return 1;
- }
-
- static int
- load_too_high ()
- {
- #if defined(__MSDOS__) || defined(VMS) || defined(_AMIGA)
- return 1;
- #else
- double load;
-
- if (max_load_average < 0)
- return 0;
-
- make_access ();
- if (getloadavg (&load, 1) != 1)
- {
- static int lossage = -1;
- /* Complain only once for the same error. */
- if (lossage == -1 || errno != lossage)
- {
- if (errno == 0)
- /* An errno value of zero means getloadavg is just unsupported. */
- error ("cannot enforce load limits on this operating system");
- else
- perror_with_name ("cannot enforce load limit: ", "getloadavg");
- }
- lossage = errno;
- load = 0;
- }
- user_access ();
-
- return load >= max_load_average;
- #endif
- }
-
- /* Start jobs that are waiting for the load to be lower. */
-
- void
- start_waiting_jobs ()
- {
- struct child *job;
-
- if (waiting_jobs == 0)
- return;
-
- do
- {
- /* Check for recently deceased descendants. */
- reap_children (0, 0);
-
- /* Take a job off the waiting list. */
- job = waiting_jobs;
- waiting_jobs = job->next;
-
- /* Try to start that job. We break out of the loop as soon
- as start_waiting_job puts one back on the waiting list. */
- }
- while (start_waiting_job (job) && waiting_jobs != 0);
-
- return;
- }
-
- #ifndef WINDOWS32
- #ifdef VMS
- #include <descrip.h>
- #include <clidef.h>
-
- /* This is called as an AST when a child process dies (it won't get
- interrupted by anything except a higher level AST).
- */
- int vmsHandleChildTerm(struct child *child)
- {
- int status;
- register struct child *lastc, *c;
- int child_failed;
-
- vms_jobsefnmask &= ~(1 << (child->efn - 32));
-
- lib$free_ef(&child->efn);
-
- (void) sigblock (fatal_signal_mask);
-
- child_failed = !(child->cstatus & 1 || ((child->cstatus & 7) == 0));
-
- /* Search for a child matching the deceased one. */
- lastc = 0;
- #if defined(RECURSIVEJOBS) /* I've had problems with recursive stuff and process handling */
- for (c = children; c != 0 && c != child; lastc = c, c = c->next);
- #else
- c = child;
- #endif
-
- if (child_failed && !c->noerror && !ignore_errors_flag)
- {
- /* The commands failed. Write an error message,
- delete non-precious targets, and abort. */
- child_error (c->file->name, c->cstatus, 0, 0, 0);
- c->file->update_status = 1;
- delete_child_targets (c);
- }
- else
- {
- if (child_failed)
- {
- /* The commands failed, but we don't care. */
- child_error (c->file->name, c->cstatus, 0, 0, 1);
- child_failed = 0;
- }
-
- #if defined(RECURSIVEJOBS) /* I've had problems with recursive stuff and process handling */
- /* If there are more commands to run, try to start them. */
- start_job (c);
-
- switch (c->file->command_state)
- {
- case cs_running:
- /* Successfully started. */
- break;
-
- case cs_finished:
- if (c->file->update_status != 0) {
- /* We failed to start the commands. */
- delete_child_targets (c);
- }
- break;
-
- default:
- error ("internal error: `%s' command_state \
- %d in child_handler", c->file->name);
- abort ();
- break;
- }
- #endif /* RECURSIVEJOBS */
- }
-
- /* Set the state flag to say the commands have finished. */
- c->file->command_state = cs_finished;
- notice_finished_file (c->file);
-
- #if defined(RECURSIVEJOBS) /* I've had problems with recursive stuff and process handling */
- /* Remove the child from the chain and free it. */
- if (lastc == 0)
- children = c->next;
- else
- lastc->next = c->next;
- free_child (c);
- #endif /* RECURSIVEJOBS */
-
- /* There is now another slot open. */
- if (job_slots_used > 0)
- --job_slots_used;
-
- /* If the job failed, and the -k flag was not given, die. */
- if (child_failed && !keep_going_flag)
- die (EXIT_FAILURE);
-
- (void) sigsetmask (sigblock (0) & ~(fatal_signal_mask));
-
- return 1;
- }
-
- /* VMS:
- Spawn a process executing the command in ARGV and return its pid. */
-
- #define MAXCMDLEN 200
-
- int
- child_execute_job (argv, child)
- char *argv;
- struct child *child;
- {
- int i;
- static struct dsc$descriptor_s cmddsc;
- #ifndef DONTWAITFORCHILD
- int spflags = 0;
- #else
- int spflags = CLI$M_NOWAIT;
- #endif
- int status;
- char cmd[4096],*p,*c;
- char comname[50];
-
- /* Remove backslashes */
- for (p = argv, c = cmd; *p; p++,c++)
- {
- if (*p == '\\') p++;
- *c = *p;
- }
- *c = *p;
-
- /* check for maximum dcl length and create *.com file if neccesary */
-
- comname[0] = '\0';
-
- if (strlen (cmd) > MAXCMDLEN)
- {
- FILE *outfile;
- char tmp;
-
- strcpy (comname, "sys$scratch:CMDXXXXXX.COM");
- (void) mktemp (comname);
-
- outfile = fopen (comname, "w");
- if (outfile == 0)
- pfatal_with_name (comname);
-
- fprintf (outfile, "$ ");
- c = cmd;
-
- while (c)
- {
- p = strchr (c, ',');
- if ((p == NULL) || (p-c > MAXCMDLEN))
- p = strchr (c, ' ');
- if (p != NULL)
- {
- p++;
- tmp = *p;
- *p = '\0';
- }
- else
- tmp = '\0';
- fprintf (outfile, "%s%s\n", c, (tmp == '\0')?"":" -");
- if (p != NULL)
- *p = tmp;
- c = p;
- }
-
- fclose (outfile);
-
- sprintf (cmd, "$ @%s", comname);
-
- if (debug_flag)
- printf ("Executing %s instead\n", cmd);
- }
-
- cmddsc.dsc$w_length = strlen(cmd);
- cmddsc.dsc$a_pointer = cmd;
- cmddsc.dsc$b_dtype = DSC$K_DTYPE_T;
- cmddsc.dsc$b_class = DSC$K_CLASS_S;
-
- child->efn = 0;
- while (child->efn < 32 || child->efn > 63)
- {
- status = lib$get_ef(&child->efn);
- if (!(status & 1))
- return 0;
- }
-
- sys$clref(child->efn);
-
- vms_jobsefnmask |= (1 << (child->efn - 32));
-
- #ifndef DONTWAITFORCHILD
- status = lib$spawn(&cmddsc,0,0,&spflags,0,&child->pid,&child->cstatus,
- &child->efn,0,0);
- vmsHandleChildTerm(child);
- #else
- status = lib$spawn(&cmddsc,0,0,&spflags,0,&child->pid,&child->cstatus,
- &child->efn,vmsHandleChildTerm,child);
- #endif
-
- if (!(status & 1))
- {
- printf("Error spawning, %d\n",status);
- fflush(stdout);
- }
-
- unlink (comname);
-
- return (status & 1);
- }
-
- #else /* !VMS */
-
- #if !defined (_AMIGA) && !defined (__MSDOS__)
- /* UNIX:
- Replace the current process with one executing the command in ARGV.
- STDIN_FD and STDOUT_FD are used as the process's stdin and stdout; ENVP is
- the environment of the new program. This function does not return. */
-
- void
- child_execute_job (stdin_fd, stdout_fd, argv, envp)
- int stdin_fd, stdout_fd;
- char **argv, **envp;
- {
- if (stdin_fd != 0)
- (void) dup2 (stdin_fd, 0);
- if (stdout_fd != 1)
- (void) dup2 (stdout_fd, 1);
- if (stdin_fd != 0)
- (void) close (stdin_fd);
- if (stdout_fd != 1)
- (void) close (stdout_fd);
-
- /* Run the command. */
- exec_command (argv, envp);
- }
- #endif /* !AMIGA && !__MSDOS__ */
- #endif /* !VMS */
- #endif /* !WINDOWS32 */
-
- #ifndef _AMIGA
- /* Replace the current process with one running the command in ARGV,
- with environment ENVP. This function does not return. */
-
- void
- exec_command (argv, envp)
- char **argv, **envp;
- {
- #ifdef VMS
- /* Run the program. */
- execve (argv[0], argv, envp);
- perror_with_name ("execve: ", argv[0]);
- _exit (EXIT_FAILURE);
- #else
- #ifdef WINDOWS32
- HANDLE hPID;
- HANDLE hWaitPID;
- int err = 0;
- int exit_code = EXIT_FAILURE;
-
- /* make sure CreateProcess() has Path it needs */
- sync_Path_environment();
-
- /* launch command */
- hPID = process_easy(argv, envp);
-
- /* make sure launch ok */
- if (hPID == INVALID_HANDLE_VALUE)
- {
- int i;
- fprintf(stderr,
- "process_easy() failed failed to launch process (e=%d)\n",
- process_last_err(hPID));
- for (i = 0; argv[i]; i++)
- fprintf(stderr, "%s ", argv[i]);
- fprintf(stderr, "\nCounted %d args in failed launch\n", i);
- exit(EXIT_FAILURE);
- }
-
- /* wait and reap last child */
- while (hWaitPID = process_wait_for_any())
- {
- /* was an error found on this process? */
- err = process_last_err(hWaitPID);
-
- /* get exit data */
- exit_code = process_exit_code(hWaitPID);
-
- if (err)
- fprintf(stderr, "make (e=%d, rc=%d): %s",
- err, exit_code, map_windows32_error_to_string(err));
-
- /* cleanup process */
- process_cleanup(hWaitPID);
-
- /* expect to find only last pid, warn about other pids reaped */
- if (hWaitPID == hPID)
- break;
- else
- fprintf(stderr,
- "make reaped child pid %d, still waiting for pid %d\n",
- hWaitPID, hPID);
- }
-
- /* return child's exit code as our exit code */
- exit(exit_code);
-
- #else /* !WINDOWS32 */
-
- /* Be the user, permanently. */
- child_access ();
-
- /* Run the program. */
- environ = envp;
- execvp (argv[0], argv);
-
- switch (errno)
- {
- case ENOENT:
- error ("%s: Command not found", argv[0]);
- break;
- case ENOEXEC:
- {
- /* The file is not executable. Try it as a shell script. */
- extern char *getenv ();
- char *shell;
- char **new_argv;
- int argc;
-
- shell = getenv ("SHELL");
- if (shell == 0)
- shell = default_shell;
-
- argc = 1;
- while (argv[argc] != 0)
- ++argc;
-
- new_argv = (char **) alloca ((1 + argc + 1) * sizeof (char *));
- new_argv[0] = shell;
- new_argv[1] = argv[0];
- while (argc > 0)
- {
- new_argv[1 + argc] = argv[argc];
- --argc;
- }
-
- execvp (shell, new_argv);
- if (errno == ENOENT)
- error ("%s: Shell program not found", shell);
- else
- perror_with_name ("execvp: ", shell);
- break;
- }
-
- default:
- perror_with_name ("execvp: ", argv[0]);
- break;
- }
-
- _exit (127);
- #endif /* !WINDOWS32 */
- #endif /* !VMS */
- }
- #else /* On Amiga */
- void exec_command (argv)
- char **argv;
- {
- MyExecute (argv);
- }
-
- void clean_tmp (void)
- {
- DeleteFile (amiga_bname);
- }
-
- #endif /* On Amiga */
-
- #ifndef VMS
- /* Figure out the argument list necessary to run LINE as a command. Try to
- avoid using a shell. This routine handles only ' quoting, and " quoting
- when no backslash, $ or ` characters are seen in the quotes. Starting
- quotes may be escaped with a backslash. If any of the characters in
- sh_chars[] is seen, or any of the builtin commands listed in sh_cmds[]
- is the first word of a line, the shell is used.
-
- If RESTP is not NULL, *RESTP is set to point to the first newline in LINE.
- If *RESTP is NULL, newlines will be ignored.
-
- SHELL is the shell to use, or nil to use the default shell.
- IFS is the value of $IFS, or nil (meaning the default). */
-
- static char **
- construct_command_argv_internal (line, restp, shell, ifs)
- char *line, **restp;
- char *shell, *ifs;
- {
- #ifdef __MSDOS__
- /* MSDOS supports both the stock DOS shell and ports of Unixy shells.
- We call `system' for anything that requires ``slow'' processing,
- because DOS shells are too dumb. When $SHELL points to a real
- (unix-style) shell, `system' just calls it to do everything. When
- $SHELL points to a DOS shell, `system' does most of the work
- internally, calling the shell only for its internal commands.
- However, it looks on the $PATH first, so you can e.g. have an
- external command named `mkdir'.
-
- Since we call `system', certain characters and commands below are
- actually not specific to COMMAND.COM, but to the DJGPP implementation
- of `system'. In particular:
-
- The shell wildcard characters are in DOS_CHARS because they will
- not be expanded if we call the child via `spawnXX'.
-
- The `;' is in DOS_CHARS, because our `system' knows how to run
- multiple commands on a single line.
-
- DOS_CHARS also include characters special to 4DOS/NDOS, so we
- won't have to tell one from another and have one more set of
- commands and special characters. */
- static char sh_chars_dos[] = "*?[];|<>%^&()";
- static char *sh_cmds_dos[] = { "break", "call", "cd", "chcp", "chdir", "cls",
- "copy", "ctty", "date", "del", "dir", "echo",
- "erase", "exit", "for", "goto", "if", "md",
- "mkdir", "path", "pause", "prompt", "rd",
- "rmdir", "rem", "ren", "rename", "set",
- "shift", "time", "type", "ver", "verify",
- "vol", ":", 0 };
-
- static char sh_chars_sh[] = "#;\"*?[]&|<>(){}$`^";
- static char *sh_cmds_sh[] = { "cd", "eval", "exec", "exit", "login",
- "logout", "set", "umask", "wait", "while",
- "for", "case", "if", ":", ".", "break",
- "continue", "export", "read", "readonly",
- "shift", "times", "trap", "switch", 0 };
-
- char *sh_chars;
- char **sh_cmds;
- #else
- #ifdef _AMIGA
- static char sh_chars[] = "#;\"|<>()?*$`";
- static char *sh_cmds[] = { "cd", "eval", "if", "delete", "echo", "copy",
- "rename", "set", "setenv", "date", "makedir",
- "skip", "else", "endif", "path", "prompt",
- "unset", "unsetenv", "version",
- 0 };
- #else
- #ifdef WINDOWS32
- static char sh_chars_dos[] = "\"|<>";
- static char *sh_cmds_dos[] = { "break", "call", "cd", "chcp", "chdir", "cls",
- "copy", "ctty", "date", "del", "dir", "echo",
- "erase", "exit", "for", "goto", "if", "if", "md",
- "mkdir", "path", "pause", "prompt", "rem", "ren",
- "rename", "set", "shift", "time", "type",
- "ver", "verify", "vol", ":", 0 };
- static char sh_chars_sh[] = "#;\"*?[]&|<>(){}$`^";
- static char *sh_cmds_sh[] = { "cd", "eval", "exec", "exit", "login",
- "logout", "set", "umask", "wait", "while", "for",
- "case", "if", ":", ".", "break", "continue",
- "export", "read", "readonly", "shift", "times",
- "trap", "switch", "test", 0 };
- char* sh_chars;
- char** sh_cmds;
- #else /* WINDOWS32 */
- static char sh_chars[] = "#;\"*?[]&|<>(){}$`^";
- static char *sh_cmds[] = { "cd", "eval", "exec", "exit", "login",
- "logout", "set", "umask", "wait", "while", "for",
- "case", "if", ":", ".", "break", "continue",
- "export", "read", "readonly", "shift", "times",
- "trap", "switch", 0 };
- #endif /* WINDOWS32 */
- #endif /* Amiga */
- #endif /* __MSDOS__ */
- register int i;
- register char *p;
- register char *ap;
- char *end;
- int instring, word_has_equals, seen_nonequals, last_argument_was_empty;
- char **new_argv = 0;
- #ifdef WINDOWS32
- int slow_flag = 0;
-
- if (no_default_sh_exe) {
- sh_cmds = sh_cmds_dos;
- sh_chars = sh_chars_dos;
- } else {
- sh_cmds = sh_cmds_sh;
- sh_chars = sh_chars_sh;
- }
- #endif /* WINDOWS32 */
-
- if (restp != NULL)
- *restp = NULL;
-
- /* Make sure not to bother processing an empty line. */
- while (isblank (*line))
- ++line;
- if (*line == '\0')
- return 0;
-
- /* See if it is safe to parse commands internally. */
- if (shell == 0)
- shell = default_shell;
- #ifdef WINDOWS32
- else if (strcmp (shell, default_shell))
- {
- char *s1 = _fullpath(NULL, shell, 0);
- char *s2 = _fullpath(NULL, default_shell, 0);
-
- slow_flag = strcmp((s1 ? s1 : ""), (s2 ? s2 : ""));
-
- if (s1);
- free(s1);
- if (s2);
- free(s2);
- }
- if (slow_flag)
- goto slow;
- #else /* not WINDOWS32 */
- #ifdef __MSDOS__
- else if (stricmp (shell, default_shell))
- {
- extern int _is_unixy_shell (const char *_path);
-
- message (1, "$SHELL changed (was `%s', now `%s')", default_shell, shell);
- unixy_shell = _is_unixy_shell (shell);
- default_shell = shell;
- }
- if (unixy_shell)
- {
- sh_chars = sh_chars_sh;
- sh_cmds = sh_cmds_sh;
- }
- else
- {
- sh_chars = sh_chars_dos;
- sh_cmds = sh_cmds_dos;
- }
- #else /* not __MSDOS__ */
- else if (strcmp (shell, default_shell))
- goto slow;
- #endif /* not __MSDOS__ */
- #endif /* not WINDOWS32 */
-
- if (ifs != 0)
- for (ap = ifs; *ap != '\0'; ++ap)
- if (*ap != ' ' && *ap != '\t' && *ap != '\n')
- goto slow;
-
- i = strlen (line) + 1;
-
- /* More than 1 arg per character is impossible. */
- new_argv = (char **) xmalloc (i * sizeof (char *));
-
- /* All the args can fit in a buffer as big as LINE is. */
- ap = new_argv[0] = (char *) xmalloc (i);
- end = ap + i;
-
- /* I is how many complete arguments have been found. */
- i = 0;
- instring = word_has_equals = seen_nonequals = last_argument_was_empty = 0;
- for (p = line; *p != '\0'; ++p)
- {
- if (ap > end)
- abort ();
-
- if (instring)
- {
- string_char:
- /* Inside a string, just copy any char except a closing quote
- or a backslash-newline combination. */
- if (*p == instring)
- {
- instring = 0;
- if (ap == new_argv[0] || *(ap-1) == '\0')
- last_argument_was_empty = 1;
- }
- else if (*p == '\\' && p[1] == '\n')
- goto swallow_escaped_newline;
- else if (*p == '\n' && restp != NULL)
- {
- /* End of the command line. */
- *restp = p;
- goto end_of_line;
- }
- /* Backslash, $, and ` are special inside double quotes.
- If we see any of those, punt.
- But on MSDOS, if we use COMMAND.COM, double and single
- quotes have the same effect. */
- else if (instring == '"' && index ("\\$`", *p) != 0 && unixy_shell)
- goto slow;
- else
- *ap++ = *p;
- }
- else if (index (sh_chars, *p) != 0)
- /* Not inside a string, but it's a special char. */
- goto slow;
- #ifdef __MSDOS__
- else if (*p == '.' && p[1] == '.' && p[2] == '.' && p[3] != '.')
- /* `...' is a wildcard in DJGPP. */
- goto slow;
- #endif
- else
- /* Not a special char. */
- switch (*p)
- {
- case '=':
- /* Equals is a special character in leading words before the
- first word with no equals sign in it. This is not the case
- with sh -k, but we never get here when using nonstandard
- shell flags. */
- if (! seen_nonequals && unixy_shell)
- goto slow;
- word_has_equals = 1;
- *ap++ = '=';
- break;
-
- case '\\':
- /* Backslash-newline combinations are eaten. */
- if (p[1] == '\n')
- {
- swallow_escaped_newline:
-
- /* Eat the backslash, the newline, and following whitespace,
- replacing it all with a single space. */
- p += 2;
-
- /* If there is a tab after a backslash-newline,
- remove it from the source line which will be echoed,
- since it was most likely used to line
- up the continued line with the previous one. */
- if (*p == '\t')
- strcpy (p, p + 1);
-
- if (instring)
- goto string_char;
- else
- {
- if (ap != new_argv[i])
- /* Treat this as a space, ending the arg.
- But if it's at the beginning of the arg, it should
- just get eaten, rather than becoming an empty arg. */
- goto end_of_arg;
- else
- p = next_token (p) - 1;
- }
- }
- else if (p[1] != '\0')
- /* Copy and skip the following char. */
- *ap++ = *++p;
- break;
-
- case '\'':
- case '"':
- instring = *p;
- break;
-
- case '\n':
- if (restp != NULL)
- {
- /* End of the command line. */
- *restp = p;
- goto end_of_line;
- }
- else
- /* Newlines are not special. */
- *ap++ = '\n';
- break;
-
- case ' ':
- case '\t':
- end_of_arg:
- /* We have the end of an argument.
- Terminate the text of the argument. */
- *ap++ = '\0';
- new_argv[++i] = ap;
- last_argument_was_empty = 0;
-
- /* Update SEEN_NONEQUALS, which tells us if every word
- heretofore has contained an `='. */
- seen_nonequals |= ! word_has_equals;
- if (word_has_equals && ! seen_nonequals)
- /* An `=' in a word before the first
- word without one is magical. */
- goto slow;
- word_has_equals = 0; /* Prepare for the next word. */
-
- /* If this argument is the command name,
- see if it is a built-in shell command.
- If so, have the shell handle it. */
- if (i == 1)
- {
- register int j;
- for (j = 0; sh_cmds[j] != 0; ++j)
- if (streq (sh_cmds[j], new_argv[0]))
- goto slow;
- }
-
- /* Ignore multiple whitespace chars. */
- p = next_token (p);
- /* Next iteration should examine the first nonwhite char. */
- --p;
- break;
-
- default:
- *ap++ = *p;
- break;
- }
- }
- end_of_line:
-
- if (instring)
- /* Let the shell deal with an unterminated quote. */
- goto slow;
-
- /* Terminate the last argument and the argument list. */
-
- *ap = '\0';
- if (new_argv[i][0] != '\0' || last_argument_was_empty)
- ++i;
- new_argv[i] = 0;
-
- if (i == 1)
- {
- register int j;
- for (j = 0; sh_cmds[j] != 0; ++j)
- if (streq (sh_cmds[j], new_argv[0]))
- goto slow;
- }
-
- if (new_argv[0] == 0)
- /* Line was empty. */
- return 0;
- else
- return new_argv;
-
- slow:;
- /* We must use the shell. */
-
- if (new_argv != 0)
- {
- /* Free the old argument list we were working on. */
- free (new_argv[0]);
- free ((void *)new_argv);
- }
-
- #ifdef __MSDOS__
- execute_by_shell = 1; /* actually, call `system' if shell isn't unixy */
- #endif
-
- #ifdef _AMIGA
- {
- char *ptr;
- char *buffer;
- char *dptr;
-
- buffer = (char *)xmalloc (strlen (line)+1);
-
- ptr = line;
- for (dptr=buffer; *ptr; )
- {
- if (*ptr == '\\' && ptr[1] == '\n')
- ptr += 2;
- else if (*ptr == '@') /* Kludge: multiline commands */
- {
- ptr += 2;
- *dptr++ = '\n';
- }
- else
- *dptr++ = *ptr++;
- }
- *dptr = 0;
-
- new_argv = (char **) xmalloc(2 * sizeof(char *));
- new_argv[0] = buffer;
- new_argv[1] = 0;
- }
- #else /* Not Amiga */
- #ifdef WINDOWS32
- /*
- * Not eating this whitespace caused things like
- *
- * sh -c "\n"
- *
- * which gave the shell fits. I think we have to eat
- * whitespace here, but this code should be considered
- * suspicious if things start failing....
- */
-
- /* Make sure not to bother processing an empty line. */
- while (isspace (*line))
- ++line;
- if (*line == '\0')
- return 0;
-
- /*
- * only come here if no sh.exe command
- */
- if (no_default_sh_exe)
- {
- FILE *batch;
- dos_batch_file = 1;
- if (dos_bname == 0)
- {
- dos_bname = tempnam (".", "mk");
- for (i = 0; dos_bname[i] != '\0'; ++i)
- if (dos_bname[i] == '/')
- dos_bname[i] = '\\';
- dos_bename = (char *) xmalloc (strlen (dos_bname) + 5);
- strcpy (dos_bename, dos_bname);
- strcat (dos_bname, ".bat");
- strcat (dos_bename, ".err");
- }
- batch = fopen (dos_bename, "w"); /* Create a file. */
- if (batch != NULL)
- fclose (batch);
- batch = fopen (dos_bname, "w");
- fputs ("@echo off\n", batch);
- fputs (line, batch);
- fprintf (batch, "\nif errorlevel 1 del %s\n", dos_bename);
- fclose (batch);
- new_argv = (char **) xmalloc(2 * sizeof(char *));
- new_argv[0] = strdup (dos_bname);
- new_argv[1] = 0;
- }
- else
- #endif /* WINDOWS32 */
- {
- /* SHELL may be a multi-word command. Construct a command line
- "SHELL -c LINE", with all special chars in LINE escaped.
- Then recurse, expanding this command line to get the final
- argument list. */
-
- unsigned int shell_len = strlen (shell);
- static char minus_c[] = " -c ";
- unsigned int line_len = strlen (line);
-
- char *new_line = (char *) alloca (shell_len + (sizeof (minus_c) - 1)
- + (line_len * 2) + 1);
-
- ap = new_line;
- bcopy (shell, ap, shell_len);
- ap += shell_len;
- bcopy (minus_c, ap, sizeof (minus_c) - 1);
- ap += sizeof (minus_c) - 1;
- for (p = line; *p != '\0'; ++p)
- {
- if (restp != NULL && *p == '\n')
- {
- *restp = p;
- break;
- }
- else if (*p == '\\' && p[1] == '\n')
- {
- /* Eat the backslash, the newline, and following whitespace,
- replacing it all with a single space (which is escaped
- from the shell). */
- p += 2;
-
- /* If there is a tab after a backslash-newline,
- remove it from the source line which will be echoed,
- since it was most likely used to line
- up the continued line with the previous one. */
- if (*p == '\t')
- bcopy (p + 1, p, strlen (p));
-
- p = next_token (p);
- --p;
- if (unixy_shell)
- *ap++ = '\\';
- *ap++ = ' ';
- continue;
- }
-
- /* DOS shells don't know about backslash-escaping. */
- if (unixy_shell &&
- (*p == '\\' || *p == '\'' || *p == '"'
- || isspace (*p)
- || index (sh_chars, *p) != 0))
- *ap++ = '\\';
- #ifdef __MSDOS__
- else if (unixy_shell && strncmp (p, "...", 3) == 0)
- {
- /* The case of `...' wildcard again. */
- strcpy (ap, "\\.\\.\\");
- ap += 5;
- p += 2;
- }
- #endif
- *ap++ = *p;
- }
- if (ap == new_line + shell_len + sizeof (minus_c) - 1)
- /* Line was empty. */
- return 0;
- *ap = '\0';
-
- if (unixy_shell)
- new_argv = construct_command_argv_internal (new_line, (char **) NULL,
- (char *) 0, (char *) 0);
- #ifdef __MSDOS__
- else
- {
- /* With MSDOS shells, we must construct the command line here
- instead of recursively calling ourselves, because we
- cannot backslash-escape the special characters (see above). */
- new_argv = (char **) xmalloc (sizeof (char *));
- line_len = strlen (new_line) - shell_len - sizeof (minus_c) + 1;
- new_argv[0] = xmalloc (line_len + 1);
- strncpy (new_argv[0],
- new_line + shell_len + sizeof (minus_c) - 1, line_len);
- new_argv[0][line_len] = '\0';
- }
- #endif
- }
- #endif /* ! AMIGA */
-
- return new_argv;
- }
-
- /* Figure out the argument list necessary to run LINE as a command. Try to
- avoid using a shell. This routine handles only ' quoting, and " quoting
- when no backslash, $ or ` characters are seen in the quotes. Starting
- quotes may be escaped with a backslash. If any of the characters in
- sh_chars[] is seen, or any of the builtin commands listed in sh_cmds[]
- is the first word of a line, the shell is used.
-
- If RESTP is not NULL, *RESTP is set to point to the first newline in LINE.
- If *RESTP is NULL, newlines will be ignored.
-
- FILE is the target whose commands these are. It is used for
- variable expansion for $(SHELL) and $(IFS). */
-
- char **
- construct_command_argv (line, restp, file)
- char *line, **restp;
- struct file *file;
- {
- char *shell, *ifs;
- char **argv;
-
- {
- /* Turn off --warn-undefined-variables while we expand SHELL and IFS. */
- int save = warn_undefined_variables_flag;
- warn_undefined_variables_flag = 0;
-
- shell = allocated_variable_expand_for_file ("$(SHELL)", file);
- #ifdef WINDOWS32
- /*
- * Convert to forward slashes so that construct_command_argv_internal()
- * is not confused.
- */
- if (shell) {
- char *p = w32ify(shell, 0);
- strcpy(shell, p);
- }
- #endif
- ifs = allocated_variable_expand_for_file ("$(IFS)", file);
-
- warn_undefined_variables_flag = save;
- }
-
- argv = construct_command_argv_internal (line, restp, shell, ifs);
-
- free (shell);
- free (ifs);
-
- return argv;
- }
- #endif /* !VMS */
-
- #if !defined(HAVE_DUP2) && !defined(_AMIGA)
- int
- dup2 (old, new)
- int old, new;
- {
- int fd;
-
- (void) close (new);
- fd = dup (old);
- if (fd != new)
- {
- (void) close (fd);
- errno = EMFILE;
- return -1;
- }
-
- return fd;
- }
- #endif /* !HAPE_DUP2 && !_AMIGA */
-