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- /* Synchronous subprocess invocation for XEmacs.
- Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994
- Free Software Foundation, Inc.
-
- This file is part of XEmacs.
-
- XEmacs 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.
-
- XEmacs 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 XEmacs; see the file COPYING. If not, write to the Free
- Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Synched up with: Mule 2.0, FSF 19.28. */
-
- #include <config.h>
- #include "lisp.h"
-
- #include "buffer.h"
- #include "commands.h"
- #include "insdel.h"
- #include "lstream.h"
- #include "mule.h"
- #include "paths.h"
- #include "process.h"
- #include "sysdep.h"
- #include "window.h"
-
- #include "sysfile.h"
- #include "systime.h"
- #include "sysproc.h"
- #include "syssignal.h" /* Always include before systty.h */
- #include "systty.h"
-
-
- #ifdef MSDOS
- /* When we are starting external processes we need to know whether they
- take binary input (no conversion) or text input (\n is converted to
- \r\n). Similar for output: if newlines are written as \r\n then it's
- text process output, otherwise it's binary. */
- Lisp_Object Vbinary_process_input;
- Lisp_Object Vbinary_process_output;
- #endif
-
- Lisp_Object Vexec_path, Vexec_directory, Vdata_directory, Vdoc_directory;
- Lisp_Object Vconfigure_info_directory;
-
- Lisp_Object Vshell_file_name;
-
- /* The environment to pass to all subprocesses when they are started.
- This is in the semi-bogus format of ("VAR=VAL" "VAR2=VAL2" ... )
- */
- Lisp_Object Vprocess_environment;
-
- /* True iff we are about to fork off a synchronous process or if we
- are waiting for it. */
- volatile int synch_process_alive;
-
- /* Nonzero => this is a string explaining death of synchronous subprocess. */
- CONST char *synch_process_death;
-
- /* If synch_process_death is zero,
- this is exit code of synchronous subprocess. */
- int synch_process_retcode;
-
- /* Clean up when exiting Fcall_process_internal.
- On MSDOS, delete the temporary file on any kind of termination.
- On Unix, kill the process and any children on termination by signal. */
-
- /* Nonzero if this is termination due to exit. */
- static int call_process_exited;
-
- #ifndef VMS /* VMS version is in vmsproc.c. */
-
- static Lisp_Object
- call_process_kill (Lisp_Object fdpid)
- {
- Lisp_Object fd = Fcar (fdpid);
- Lisp_Object pid = Fcdr (fdpid);
-
- if (!NILP (fd))
- close (XINT (fd));
-
- if (!NILP (pid))
- EMACS_KILLPG (XINT (pid), SIGKILL);
-
- synch_process_alive = 0;
- return Qnil;
- }
-
- static Lisp_Object
- call_process_cleanup (Lisp_Object fdpid)
- {
- #ifdef MSDOS
- /* for MSDOS fdpid is really (fd . tempfile) */
- Lisp_Object file = Fcdr (fdpid);
- close (XINT (Fcar (fdpid)));
- if (strcmp (string_ext_data (XSTRING (file)), NULL_DEVICE) != 0)
- unlink (string_data (XSTRING (file)));
- #else /* not MSDOS */
- int fd = XINT (Fcar (fdpid));
- int pid = XINT (Fcdr (fdpid));
-
- #ifdef WIN32
- CloseHandle (XINT (Fcar (fdpid))); /* fd = Fcar (fdpid) */
- #else
- if (!call_process_exited &&
- EMACS_KILLPG (pid, SIGINT) == 0)
- {
- int speccount = specpdl_depth ();
-
- record_unwind_protect (call_process_kill, fdpid);
- /* #### "c-G" -- need non-consing Single-key-description */
- message ("Waiting for process to die...(type C-g again to kill it instantly)");
-
- /* "Discard" the unwind protect. */
- XCAR (fdpid) = Qnil;
- XCDR (fdpid) = Qnil;
- unbind_to (speccount, Qnil);
-
- message ("Waiting for process to die... done");
- }
- #endif /* not WIN32 */
- synch_process_alive = 0;
- close (fd);
- #endif /* not MSDOS */
- return Qnil;
- }
-
- static Lisp_Object fork_error;
- #if 0 /* UNUSED */
- static void
- report_fork_error (char *string, Lisp_Object data)
- {
- Lisp_Object errstring = build_string (strerror (errno));
-
- /* System error messages are capitalized. Downcase the initial. */
- set_string_char (XSTRING (errstring), 0,
- DOWNCASE (current_buffer,
- string_char (XSTRING (errstring), 0)));
-
- fork_error = Fcons (build_string (string), Fcons (errstring, data));
-
- /* terminate this branch of the fork, without closing stdin/out/etc. */
- _exit (1);
- }
- #endif /* unused */
-
- DEFUN ("call-process-internal", Fcall_process_internal,
- Scall_process_internal, 1, MANY, 0,
- "Call PROGRAM synchronously in separate process, with coding-system specified.\n\
- Arguments are\n\
- (PROGRAM &optional INFILE BUFFER DISPLAY &rest ARGS).\n\
- The program's input comes from file INFILE (nil means `/dev/null').\n\
- Insert output in BUFFER before point; t means current buffer;\n\
- nil for BUFFER means discard it; 0 means discard and don't wait.\n\
- Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\
- Remaining arguments are strings passed as command arguments to PROGRAM.\n\
- If BUFFER is 0, returns immediately with value nil.\n\
- Otherwise waits for PROGRAM to terminate and returns a numeric exit status\n\
- or a signal description string.\n\
- If you quit, the process is killed with SIGINT, or SIGKILL if you\n\
- quit again.")
- (nargs, args)
- int nargs;
- Lisp_Object *args;
- {
- /* This function can GC */
- Lisp_Object infile, buffer, current_dir, display, path;
- int fd[2];
- int filefd;
- int pid;
- char buf[1024];
- int speccount = specpdl_depth ();
- char **new_argv
- = (char **) alloca ((max (2, nargs - 2)) * sizeof (char *));
-
- #ifdef MSDOS
- char *outf, *tempfile;
- int outfilefd;
- #endif
-
- CHECK_STRING (args[0], 0);
-
- #if defined (NO_SUBPROCESSES)
- /* Without asynchronous processes we cannot have BUFFER == 0. */
- if (nargs >= 3 && !INTP (args[2]))
- error ("Operating system cannot handle asynchronous subprocesses");
- #endif
-
- /* Do this before building new_argv because GC in Lisp code
- * called by various filename-hacking routines might relocate strings */
- locate_file (Vexec_path, args[0], EXEC_SUFFIXES, &path, X_OK);
-
- /* Make sure that the child will be able to chdir to the current
- buffer's current directory, or its unhandled equivalent. We
- can't just have the child check for an error when it does the
- chdir, since it's in a vfork. */
- {
- struct gcpro gcpro1, gcpro2;
- /* Do this test before building new_argv because GC in Lisp code
- * called by various filename-hacking routines might relocate strings */
- /* Make sure that the child will be able to chdir to the current
- buffer's current directory. We can't just have the child check
- for an error when it does the chdir, since it's in a vfork. */
-
- GCPRO2 (current_dir, path); /* Caller gcprotects args[] */
- current_dir = current_buffer->directory;
- current_dir = expand_and_dir_to_file
- (Funhandled_file_name_directory (current_dir), Qnil);
- #if 0
- /* I don't know how RMS intends this crock of shit to work, but it
- breaks everything in the presence of ange-ftp-visited files, so
- fuck it. */
- if (NILP (Ffile_accessible_directory_p (current_dir)))
- report_file_error ("Setting current directory",
- Fcons (current_buffer->directory, Qnil));
- #endif /* 0 */
- UNGCPRO;
- }
-
- if (nargs >= 2 && ! NILP (args[1]))
- {
- infile = Fexpand_file_name (args[1],
- current_buffer->directory);
- CHECK_STRING (infile, 1);
- }
- else
- infile = build_string (NULL_DEVICE);
-
- if (nargs >= 3)
- {
- buffer = args[2];
- if (!(EQ (buffer, Qnil)
- || EQ (buffer, Qt)
- || EQ (buffer, Qzero)))
- {
- buffer = Fget_buffer (buffer);
- CHECK_BUFFER (buffer, 2);
- }
- }
- else
- buffer = Qnil;
-
- display = ((nargs >= 4) ? args[3] : Qnil);
-
- /* From here we assume we won't GC (unless an error is signalled). */
- {
- REGISTER int i;
- for (i = 4; i < nargs; i++)
- {
- CHECK_STRING (args[i], i);
- new_argv[i - 3] = (char *) string_data (XSTRING (args[i]));
- }
- /* Program name is first command arg */
- new_argv[0] = (char *) string_data (XSTRING (args[0]));
- new_argv[i - 3] = 0;
- }
-
- filefd = open ((char *) string_data (XSTRING (infile)), O_RDONLY, 0);
- if (filefd < 0)
- {
- report_file_error ("Opening process input file",
- Fcons (infile, Qnil));
- }
-
- if (NILP (path))
- {
- close (filefd);
- report_file_error ("Searching for program",
- Fcons (args[0], Qnil));
- }
- new_argv[0] = (char *) string_data (XSTRING (path));
-
- #ifdef MSDOS
- /* These vars record information from process termination.
- Clear them now before process can possibly terminate,
- to avoid timing error if process terminates soon. */
- synch_process_death = 0;
- synch_process_retcode = 0;
-
- if ((outf = egetenv ("TMP")) || (outf = egetenv ("TEMP")))
- strcpy (tempfile = alloca (strlen (outf) + 20), outf);
- else
- {
- tempfile = alloca (20);
- *tempfile = '\0';
- }
- dostounix_filename (tempfile);
- if (*tempfile == '\0' || tempfile[strlen (tempfile) - 1] != '/')
- strcat (tempfile, "/");
- strcat (tempfile, "detmp.XXX");
- mktemp (tempfile);
-
- outfilefd = creat (tempfile, S_IREAD | S_IWRITE);
- if (outfilefd < 0)
- {
- close (filefd);
- report_file_error ("Opening process output file",
- Fcons (tempfile, Qnil));
- }
- #endif
-
- #ifndef MSDOS
- if (INTP (buffer))
- {
- fd[1] = open (NULL_DEVICE, O_WRONLY, 0);
- fd[0] = -1;
- }
- else
- {
- pipe (fd);
- #if 0
- /* Replaced by close_process_descs */
- set_exclusive_use (fd[0]);
- #endif
- }
- #else /* MSDOS */
- {
- char *outf;
-
- if (INTP (buffer))
- outf = NULL_DEVICE;
- else
- {
- /* DOS can't create pipe for interprocess communication,
- so redirect child process's standard output to temporary file
- and later read the file. */
-
- if ((outf = egetenv ("TMP")) || (outf = egetenv ("TEMP")))
- {
- strcpy (tempfile, outf);
- dostounix_filename (tempfile);
- }
- else
- *tempfile = '\0';
- if (strlen (tempfile) == 0 || tempfile[strlen (tempfile) - 1] != '/')
- strcat (tempfile, "/");
- strcat (tempfile, "demacs.XXX");
- mktemp (tempfile);
- outf = tempfile;
- }
-
- if ((fd[1] = creat (outf, S_IREAD | S_IWRITE)) < 0)
- report_file_error ("Can't open temporary file", Qnil);
- fd[0] = -1;
- }
- #endif /* MSDOS */
-
- {
- /* child_setup must clobber environ in systems with true vfork.
- Protect it from permanent change. */
- REGISTER char **save_environ = environ;
- REGISTER int fd1 = fd[1];
- char **env;
-
- #ifdef EMACS_BTL
- /* when performance monitoring is on, turn it off before the vfork(),
- as the child has no handler for the signal -- when back in the
- parent process, turn it back on if it was really on when you "turned
- it off" */
- int logging_on = cadillac_stop_logging ();
- #endif
-
- env = environ;
-
- /* Record that we're about to create a synchronous process. */
- synch_process_alive = 1;
-
- /* These vars record information from process termination.
- Clear them now before process can possibly terminate,
- to avoid timing error if process terminates soon. */
- synch_process_death = 0;
- synch_process_retcode = 0;
-
- #ifdef MSDOS
- /* ??? Someone who knows MSDOG needs to check whether this properly
- closes all descriptors that it opens. */
- pid = run_msdos_command (new_argv, current_dir, filefd, outfilefd);
- close (outfilefd);
- fd1 = -1; /* No harm in closing that one! */
- fd[0] = open (tempfile, NILP (Vbinary_process_output) ? O_TEXT :
- O_BINARY);
- if (fd[0] < 0)
- {
- unlink (tempfile);
- close (filefd);
- report_file_error ("Cannot re-open temporary file", Qnil);
- }
- #else /* not MSDOS */
- #ifdef WIN32
- {
- HANDLE temp;
-
- DuplicateHandle (GetCurrentProcess (), (HANDLE) fd[0],
- GetCurrentProcess (), &temp, 0,
- FALSE, DUPLICATE_SAME_ACCESS);
-
- CloseHandle ((HANDLE) fd[0]);
- fd[0] = (int) temp; /* for later access */
-
- child_setup (filefd, fd1, fd1, new_argv, env);
- }
- #else /* not WIN32 */
- fork_error = Qnil;
- pid = vfork ();
-
- if (pid == 0)
- {
- if (fd[0] >= 0)
- close (fd[0]);
- /* This is necessary because some shells may attempt to
- access the current controlling terminal and will hang
- if they are run in the background, as will be the case
- when XEmacs is started in the background. Martin
- Buchholz observed this problem running a subprocess
- that used zsh to call gzip to uncompress an info
- file. */
- disconnect_controlling_terminal ();
- #ifndef MSDOS
- child_setup (filefd, fd1, fd1, new_argv, env,
- (char *) string_data (XSTRING (current_dir)));
- #endif
- }
- #ifdef EMACS_BTL
- else if (logging_on)
- cadillac_start_logging ();
- #endif
-
- #endif /* not WIN32 */
- #endif /* not MSDOS */
-
- environ = save_environ;
-
- /* Close most of our fd's, but not fd[0]
- since we will use that to read input from. */
- close (filefd);
- #ifdef WIN32
- if (fd1 >= 0)
- CloseHandle ((HANDLE) fd1);
- #else /* not WIN32 */
- if (fd1 >= 0)
- close (fd1);
- #endif /* not WIN32 */
- }
-
- if (!NILP (fork_error))
- signal_error (Qfile_error, fork_error);
-
- #if !defined (WIN32)
- if (pid < 0)
- {
- if (fd[0] >= 0)
- close (fd[0]);
- report_file_error ("Doing vfork", Qnil);
- }
- #endif /* not WIN32 */
-
- if (INTP (buffer))
- {
- if (fd[0] >= 0)
- close (fd[0]);
- #if defined (NO_SUBPROCESSES)
- /* If Emacs has been built with asynchronous subprocess support,
- we don't need to do this, I think because it will then have
- the facilities for handling SIGCHLD. */
- wait_without_blocking ();
- #endif
- return Qnil;
- }
-
- {
- int nread;
- int first;
- int state = 1;
- Lisp_Object instream;
- struct gcpro gcpro1;
-
- /* Enable sending signal if user quits below. */
- call_process_exited = 0;
-
- #ifdef MSDOS
- /* MSDOS needs different cleanup information. */
- record_unwind_protect (call_process_cleanup,
- Fcons (make_number (fd[0]),
- build_string (tempfile)));
- #else
- record_unwind_protect (call_process_cleanup,
- Fcons (make_number (fd[0]), make_number (pid)));
- #endif /* not MSDOS */
-
- first = 1;
- if (EQ (buffer, Qt))
- XSETBUFFER (buffer, current_buffer);
- instream = make_filedesc_stream (fd[0], LSTR_ALLOW_QUIT);
- #ifdef MULE
- instream =
- make_mule_encoding_stream
- (XLSTREAM (instream),
- decode_coding_system_variable (Vprocess_input_coding_system));
- #endif
- GCPRO1 (instream);
- while (state)
- {
- QUIT;
- nread = Lstream_read (XLSTREAM (instream), buf, sizeof buf);
- if (nread <= 0) state = 0;
- if (!NILP (buffer))
- {
- if (state)
- buffer_insert_raw_string (XBUFFER (buffer), (Bufbyte *) buf,
- nread);
- }
- if (!NILP (display) && INTERACTIVE)
- {
- first = 0;
- redisplay ();
- }
- }
- Lstream_close (XLSTREAM (instream));
- UNGCPRO;
-
- QUIT;
- #ifndef MSDOS
- /* Wait for it to terminate, unless it already has. */
- wait_for_termination (pid);
- #endif
-
- /* Don't kill any children that the subprocess may have left behind
- when exiting. */
- call_process_exited = 1;
- unbind_to (speccount, Qnil);
-
- if (synch_process_death)
- return build_string (synch_process_death);
- return make_number (synch_process_retcode);
- }
- }
-
- #endif /* VMS */
-
- #ifndef VMS /* VMS version is in vmsproc.c. */
-
- /* This is the last thing run in a newly forked inferior
- either synchronous or asynchronous.
- Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
- Initialize inferior's priority, pgrp, connected dir and environment.
- then exec another program based on new_argv.
-
- This function may change environ for the superior process.
- Therefore, the superior process must save and restore the value
- of environ around the vfork and the call to this function.
-
- ENV is the environment for the subprocess.
-
- CURRENT_DIR is an elisp string giving the path of the current
- directory the subprocess should have. Since we can't really signal
- a decent error from within the child, this should be verified as an
- executable directory by the parent. */
-
- #ifdef MSDOS
-
- child_setup (int in, int out, int err, char **new_argv, char **env)
- {
- int i;
- int st;
- char oldwd[MAXPATHLEN+1];
- #ifdef GO32
- char com[256];
-
- *com = '\0';
- /* Copy command name into command line buffer. */
- {
- char *suffix = strchr (new_argv[0], '.');
- if (strncmp (new_argv[0], ".bat", 4))
- {
- strcat (com, string_data (XSTRING (Vshell_file_name)));
- strcat (com, " -c ");
- }
- }
- strcat (com, new_argv[0]);
- strcat (com, " ");
- /* Convert path delimiter in command name into MSDOS fashon. */
- {
- char *p;
- for (p = com; *p; p++)
- if (*p == '/')
- *p = '\\';
- else if (*p == '-')
- *p = '/';
- }
- for (i = 1; new_argv[i]; i++)
- strcat (strcat (com, new_argv[i]), " ");
- #endif /* GO32 */
-
- getwd (oldwd);
-
- {
- /* change directory */
- if (STRINGP (current_buffer->directory))
- {
- unsigned char *temp;
- int i;
-
- i = string_length (XSTRING (current_buffer->directory));
- temp = (unsigned char *) alloca (i + 2);
- memcpy (temp, string_data (XSTRING (current_buffer->directory)), i);
- if (temp[i - 1] != '/') temp[i++] = '/';
- temp[i] = 0;
- chdir (temp);
- }
- }
-
- {
- int inbak, outbak, errbak;
-
- inbak = dup (0); outbak = dup (1); errbak = dup (2);
- if (inbak < 0 || outbak < 0 || errbak < 0)
- goto skip;
-
- dup2 (in, 0);
- dup2 (out, 1);
- dup2 (out, 2);
-
- #ifdef GO32
- synch_process_retcode = system (com);
- #else
- #ifdef EMX
- synch_process_retcode
- = spawnvpe (P_WAIT, new_argv[0], (char **) new_argv, (char **) environ);
- #endif
- #endif
-
- close (in);
- close (out);
- dup2 (inbak, 0); dup2 (outbak, 1); dup2 (errbak, 2);
-
- skip:
- close (inbak); close (outbak); close (errbak);
- }
-
- chdir (oldwd);
- #if 0
- if (synch_process_retcode < 0)
- report_file_error ("Can't execute", Fcons (args[0], Qnil));
- #endif
- }
-
- #else /* not MSDOS */
- #ifdef WIN32
-
- child_setup (int in, int out, int err, char **new_argv, char **env)
- {
- int i;
- int st;
- char *com;
- #if 1
- char oldwd[MAXPATHLEN+1];
- #else
- char *asynch_process_directory;
- #endif
-
- com = (char *) malloc (1024);
- *com = '\0';
- /* Copy command name into command line buffer. */
- {
- char *suffix = strchr (new_argv[0], '.');
- if (strncmp (new_argv[0], ".bat", 4))
- {
- lstrcpy (com, string_data (XSTRING (Vshell_file_name)));
- lstrcat (com, " -c ");
- }
- }
- lstrcat (com, new_argv[0]);
- lstrcat (com, " ");
- /* Convert path delimiter in command name into MSDOS fashon. */
- {
- char *p;
- for (p = com; *p; p++)
- if (*p == '/')
- *p = '\\';
- else if (*p == '-')
- *p = '/';
- }
- for (i = 1; new_argv[i]; i++)
- lstrcat (lstrcat (com, new_argv[i]), " ");
-
- #if 1
- getwd (oldwd);
-
- {
- /* change directory */
- if (STRINGP (current_buffer->directory))
- {
- unsigned char *temp;
- int i;
-
- i = string_length (XSTRING (current_buffer->directory));
- temp = (unsigned char *) alloca (i + 2);
- memcpy (temp, string_data (XSTRING (current_buffer->directory)), i);
- if (temp[i - 1] != '/') temp[i++] = '/';
- temp[i] = 0;
- chdir (temp);
- }
- }
- #else
- if (STRINGP (current_buffer->directory))
- {
- int i;
-
- i = string_length (XSTRING (current_buffer->directory));
- asynch_process_directory = (unsigned char *) alloca (i + 2);
- memcpy (asynch_process_directory,
- string_data (XSTRING (current_buffer->directory)), i);
- if (asynch_process_directory[i - 1] != '/')
- asynch_process_directory[i++] = '/';
- asynch_process_directory[i] = 0;
- }
- #endif
-
- {
- extern HANDLE hStdin, hStdout, hStderr;
-
- if (in && out && err) {
- if (!SetStdHandle (STD_INPUT_HANDLE, (HANDLE) in) ||
- !SetStdHandle (STD_OUTPUT_HANDLE, (HANDLE) out) ||
- !SetStdHandle (STD_ERROR_HANDLE, (HANDLE) err))
- goto restore;
- }
-
- {
- PROCESS_INFORMATION piProcInfo;
- STARTUPINFO siStartInfo;
-
- /* Set up fields of STARTUPINFO structure */
- siStartInfo.cb = sizeof (STARTUPINFO);
- siStartInfo.lpReserved = 0;
- siStartInfo.lpReserved2 = 0;
- siStartInfo.cbReserved2 = 0;
- siStartInfo.lpDesktop = 0;
- siStartInfo.dwFlags = 0;
-
- /* Create child process */
- {
- st = CreateProcess ((LPCTSTR) 0,
- (LPCTSTR) com,
- (LPSECURITY_ATTRIBUTES) 0,
- (LPSECURITY_ATTRIBUTES) 0,
- TRUE, /* inherit handles */
- 0,
- (LPVOID) 0,
- #if 1
- (LPTSTR) 0,
- #else
- asnych_process_directory,
- #endif
- &siStartInfo, &piProcInfo);
- }
- }
-
- restore:
- if (in && out && err) {
- SetStdHandle (STD_INPUT_HANDLE, hStdin);
- SetStdHandle (STD_OUTPUT_HANDLE, hStdout);
- SetStdHandle (STD_ERROR_HANDLE, hStderr);
- }
- }
-
- free (com);
- #if 1
- chdir (oldwd);
- #endif
- if (!st)
- report_file_error ("Can't execute", Fcons (new_argv[0], Qnil));
- }
-
- #else /* not WIN32 */
-
- static int relocate_fd (int fd, int min);
-
- void
- child_setup (int in, int out, int err, char **new_argv, char **env,
- CONST char *current_dir)
- {
- char *pwd;
-
- #ifdef SET_EMACS_PRIORITY
- if (emacs_priority != 0)
- nice (- emacs_priority);
- #endif
-
- #if !defined (NO_SUBPROCESSES)
- /* Close Emacs's descriptors that this process should not have. */
- close_process_descs ();
- #endif
- close_load_descs ();
-
- /* Note that use of alloca is always safe here. It's obvious for systems
- that do not have true vfork or that have true (stack) alloca.
- If using vfork and C_ALLOCA it is safe because that changes
- the superior's static variables as if the superior had done alloca
- and will be cleaned up in the usual way. */
- {
- REGISTER int i;
-
- i = strlen (current_dir);
- pwd = (char *) alloca (i + 6);
- memcpy (pwd, "PWD=", 4);
- memcpy (pwd + 4, current_dir, i);
- i += 4;
- if (pwd[i - 1] != '/')
- pwd[i++] = '/';
- pwd[i] = 0;
-
- /* We can't signal an Elisp error here; we're in a vfork. Since
- the callers check the current directory before forking, this
- should only return an error if the directory's permissions
- are changed between the check and this chdir, but we should
- at least check. */
- if (chdir (pwd + 4) < 0)
- {
- /* Don't report the chdir error, or ange-ftp.el doesn't work. */
- pwd = 0;
- }
- else
- {
- /* Strip trailing "/". Cretinous *[]&@$#^%@#$% Un*x */
- /* leave "//" (from FSF) */
- while (i > 6 && pwd[--i] == '/')
- pwd[i] = 0;
- }
- }
-
- /* Set `env' to a vector of the strings in Vprocess_environment. */
- {
- REGISTER Lisp_Object tem;
- REGISTER char **new_env;
- REGISTER int new_length;
-
- new_length = 0;
- for (tem = Vprocess_environment;
- (CONSP (tem)
- && STRINGP (XCAR (tem)));
- tem = XCDR (tem))
- new_length++;
-
- /* new_length + 2 to include PWD and terminating 0. */
- env = new_env = (char **) alloca ((new_length + 2) * sizeof (char *));
-
- /* If we have a PWD envvar and we know the real current directory,
- pass one down, but with corrected value. */
- if (pwd && getenv ("PWD"))
- *new_env++ = pwd;
-
- /* Copy the Vprocess_environment strings into new_env. */
- for (tem = Vprocess_environment;
- (CONSP (tem)
- && STRINGP (XCAR (tem)));
- tem = XCDR (tem))
- {
- char **ep = env;
- char *string = (char *) string_data (XSTRING (XCAR (tem)));
- /* See if this string duplicates any string already in the env.
- If so, don't put it in.
- When an env var has multiple definitions,
- we keep the definition that comes first in process-environment. */
- for (; ep != new_env; ep++)
- {
- char *p = *ep, *q = string;
- while (1)
- {
- if (*q == 0)
- /* The string is malformed; might as well drop it. */
- goto duplicate;
- if (*q != *p)
- break;
- if (*q == '=')
- goto duplicate;
- p++, q++;
- }
- }
- if (pwd && !strncmp ("PWD=", string, 4))
- {
- *new_env++ = pwd;
- pwd = 0;
- }
- else
- *new_env++ = string;
- duplicate: ;
- }
- *new_env = 0;
- }
-
- /* Make sure that in, out, and err are not actually already in
- descriptors zero, one, or two; this could happen if Emacs is
- started with its standard in, out, or error closed, as might
- happen under X. */
- in = relocate_fd (in, 3);
- if (out == err)
- err = out = relocate_fd (out, 3);
- else
- {
- out = relocate_fd (out, 3);
- err = relocate_fd (err, 3);
- }
-
- close (0);
- close (1);
- close (2);
-
- dup2 (in, 0);
- dup2 (out, 1);
- dup2 (err, 2);
- close (in);
- close (out);
- close (err);
-
- #ifdef vipc
- something missing here;
- #endif /* vipc */
-
- /* execvp does not accept an environment arg so the only way
- to pass this environment is to set environ. Our caller
- is responsible for restoring the ambient value of environ. */
- environ = env;
- execvp (new_argv[0], new_argv);
-
- stdout_out ("Couldn't exec the program %s", new_argv[0]);
- _exit (1);
- }
-
- #endif /* not WIN32 */
- #endif /* not MSDOS */
-
- /* Move the file descriptor FD so that its number is not less than MIN.
- If the file descriptor is moved at all, the original is freed. */
- static int
- relocate_fd (int fd, int min)
- {
- if (fd >= min)
- return fd;
- else
- {
- int new = dup (fd);
- if (new == -1)
- {
- stderr_out ("Error while setting up child: %s\n",
- strerror (errno), "\n");
- _exit (1);
- }
- /* Note that we hold the original FD open while we recurse,
- to guarantee we'll get a new FD if we need it. */
- new = relocate_fd (new, min);
- close (fd);
- return new;
- }
- }
-
- static int
- getenv_internal (CONST Bufbyte *var,
- Bytecount varlen,
- Bufbyte **value,
- Bytecount *valuelen)
- {
- Lisp_Object scan;
-
- for (scan = Vprocess_environment; CONSP (scan); scan = XCDR (scan))
- {
- Lisp_Object entry = XCAR (scan);
-
- if (STRINGP (entry)
- && string_length (XSTRING (entry)) > varlen
- && string_byte (XSTRING (entry), varlen) == '='
- && ! memcmp (string_data (XSTRING (entry)), var, varlen))
- {
- *value = string_data (XSTRING (entry)) + (varlen + 1);
- *valuelen = string_length (XSTRING (entry)) - (varlen + 1);
- return 1;
- }
- }
-
- return 0;
- }
-
- DEFUN ("getenv", Fgetenv, Sgetenv, 1, 2, "sEnvironment variable: \np",
- "Return the value of environment variable VAR, as a string.\n\
- VAR is a string, the name of the variable.\n\
- When invoked interactively, prints the value in the echo area.")
- (var, interactivep)
- Lisp_Object var, interactivep;
- {
- Bufbyte *value;
- Bytecount valuelen;
- Lisp_Object v = Qnil;
- struct gcpro gcpro1;
-
- CHECK_STRING (var, 0);
- GCPRO1 (v);
- if (getenv_internal (string_data (XSTRING (var)),
- string_length (XSTRING (var)),
- &value, &valuelen))
- v = make_string (value, valuelen);
- if (!NILP (interactivep))
- {
- if (NILP (v))
- message ("%s not defined in environment",
- string_data (XSTRING (var)));
- else
- message ("\"%s\"", value);
- }
- RETURN_UNGCPRO (v);
- }
-
- /* A version of getenv that consults process_environment, easily
- callable from C. */
- char *
- egetenv (CONST char *var)
- {
- Bufbyte *value;
- Bytecount valuelen;
-
- if (getenv_internal ((Bufbyte *) var, strlen (var), &value, &valuelen))
- return (char *) value;
- else
- return 0;
- }
- #endif /* not VMS */
-
-
- void
- init_callproc (void)
- {
- /* This function can GC */
- REGISTER char *sh;
- Lisp_Object tempdir;
-
- Vprocess_environment = Qnil;
- /* jwz: always initialize Vprocess_environment, so that egetenv() works
- in temacs. */
- {
- char **envp;
- for (envp = environ; *envp; envp++)
- Vprocess_environment = Fcons (build_string (*envp),
- Vprocess_environment);
- }
-
- /* jwz: don't do these things when in temacs (this used to be the case by
- virtue of egetenv() always returning 0, but that has been changed).
- */
- #ifndef CANNOT_DUMP
- if (!initialized)
- {
- Vdata_directory = Qnil;
- Vdoc_directory = Qnil;
- Vexec_path = Qnil;
- }
- else
- #endif
- {
- char *data_dir = egetenv ("EMACSDATA");
- char *doc_dir = egetenv ("EMACSDOC");
-
- #ifdef PATH_DATA
- if (!data_dir)
- data_dir = (char *) PATH_DATA;
- #endif
- #ifdef PATH_DOC
- if (!doc_dir)
- doc_dir = (char *) PATH_DOC;
- #endif
-
- if (data_dir)
- Vdata_directory = Ffile_name_as_directory
- (build_string (data_dir));
- else
- Vdata_directory = Qnil;
- if (doc_dir)
- Vdoc_directory = Ffile_name_as_directory
- (build_string (doc_dir));
- else
- Vdoc_directory = Qnil;
-
- /* Check the EMACSPATH environment variable, defaulting to the
- PATH_EXEC path from paths.h. */
- Vexec_path = decode_env_path ("EMACSPATH",
- #ifdef PATH_EXEC
- PATH_EXEC
- #else
- 0
- #endif
- );
- }
-
- if (NILP (Vexec_path))
- Vexec_directory = Qnil;
- else
- Vexec_directory = Ffile_name_as_directory
- (Fcar (Vexec_path));
-
- if (initialized)
- Vexec_path = nconc2 (decode_env_path ("PATH", 0),
- Vexec_path);
-
- if (!NILP (Vexec_directory))
- {
- tempdir = Fdirectory_file_name (Vexec_directory);
- if (access ((char *) string_data (XSTRING (tempdir)), 0) < 0)
- {
- /* If the hard-coded path is bogus, fail silently.
- This will allow the normal heuristics to make an attempt. */
- #if 0
- warn_when_safe
- (Qpath, Qwarning,
- "Warning: machine-dependent data dir (%s) does not exist.\n",
- string_data (XSTRING (Vexec_directory)));
- #else
- Vexec_directory = Qnil;
- #endif
- }
- }
-
- if (!NILP (Vdata_directory))
- {
- tempdir = Fdirectory_file_name (Vdata_directory);
- if (access ((char *) string_data (XSTRING (tempdir)), 0) < 0)
- {
- /* If the hard-coded path is bogus, fail silently.
- This will allow the normal heuristics to make an attempt. */
- #if 0
- warn_when_safe
- (Qpath, Qwarning,
- "Warning: machine-independent data dir (%s) does not exist.\n",
- string_data (XSTRING (Vdata_directory)));
- #else
- Vdata_directory = Qnil;
- #endif
- }
- }
-
- #ifdef VMS
- Vshell_file_name = build_string ("*dcl*");
- #else /* not VMS */
- sh = (char *) egetenv ("SHELL");
- #if defined(MSDOS) || defined(WIN32)
- if (!sh) sh = egetenv ("COMSPEC");
- {
- char *tem;
- if (sh)
- {
- tem = (char *) alloca (strlen (sh) + 1);
- sh = dostounix_filename (strcpy (tem, sh));
- }
- }
- #ifdef WIN32
- Vshell_file_name = build_string (sh ? sh : "/winnt/system32/cmd.exe");
- #else /* MSDOS */
- Vshell_file_name = build_string (sh ? sh : "/command.com");
- #endif /* MSDOS */
- #else /* not MSDOS and not WIN32 */
- Vshell_file_name = build_string (sh ? sh : "/bin/sh");
- #endif /* not MSDOS and not WIN32 */
- #endif /* not VMS */
- }
-
- #if 0
- void
- set_process_environment (void)
- {
- REGISTER char **envp;
-
- Vprocess_environment = Qnil;
- #ifndef CANNOT_DUMP
- if (initialized)
- #endif
- for (envp = environ; *envp; envp++)
- Vprocess_environment = Fcons (build_string (*envp),
- Vprocess_environment);
- }
- #endif /* unused */
-
- void
- syms_of_callproc (void)
- {
- #ifndef VMS
- defsubr (&Scall_process_internal);
- defsubr (&Sgetenv);
- #endif
- }
-
- void
- vars_of_callproc (void)
- {
- /* This function can GC */
- #ifdef MSDOS
- DEFVAR_LISP ("binary-process-input", &Vbinary_process_input,
- "*If non-nil then new subprocesses are assumed to take binary input.");
- Vbinary_process_input = Qnil;
-
- DEFVAR_LISP ("binary-process-output", &Vbinary_process_output,
- "*If non-nil then new subprocesses are assumed to produce binary output.");
- Vbinary_process_output = Qnil;
- #endif
-
- DEFVAR_LISP ("shell-file-name", &Vshell_file_name,
- "*File name to load inferior shells from.\n\
- Initialized from the SHELL environment variable.");
-
- DEFVAR_LISP ("exec-path", &Vexec_path,
- "*List of directories to search programs to run in subprocesses.\n\
- Each element is a string (directory name) or nil (try default directory).");
-
- DEFVAR_LISP ("exec-directory", &Vexec_directory,
- "Directory of architecture-dependent files that come with XEmacs,\n\
- especially executable programs intended for Emacs to invoke.");
-
- DEFVAR_LISP ("data-directory", &Vdata_directory,
- "Directory of architecture-independent files that come with XEmacs,\n\
- intended for Emacs to use.");
-
- /* #### FSF puts the DOC file into data-directory.
- Argue with JWZ if you want to change this. */
- DEFVAR_LISP ("doc-directory", &Vdoc_directory,
- "Directory containing the DOC file that comes with XEmacs.\n\
- This is usually the same as exec-directory.");
-
- DEFVAR_LISP ("process-environment", &Vprocess_environment,
- "List of environment variables for subprocesses to inherit.\n\
- Each element should be a string of the form ENVVARNAME=VALUE.\n\
- The environment which Emacs inherits is placed in this variable\n\
- when Emacs starts.");
- }
-
- void
- complex_vars_of_callproc (void)
- {
- DEFVAR_LISP ("configure-info-directory", &Vconfigure_info_directory,
- "For internal use by the build procedure only.\n\
- This is the name of the directory in which the build procedure installed\n\
- Emacs's info files; the default value for Info-default-directory-list\n\
- includes this.");
- #ifdef PATH_INFO
- Vconfigure_info_directory =
- Ffile_name_as_directory (build_string (PATH_INFO));
- #else
- Vconfigure_info_directory = Qnil;
- #endif
- }
-