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- /*
- Copyright (C) 1993 Free Software Foundation
-
- This file is part of the GNU IO Library. This library 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.
-
- This library 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 CC; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- As a special exception, if you link this library with files
- compiled with a GNU compiler to produce an executable, this does not cause
- the resulting executable to be covered by the GNU General Public License.
- This exception does not however invalidate any other reasons why
- the executable file might be covered by the GNU General Public License. */
-
- /* written by Per Bothner (bothner@cygnus.com) */
-
- #include "libioP.h"
-
- #if _IO_HAVE_SYS_WAIT
- #include <signal.h>
- #include <unistd.h>
- #include <sys/wait.h>
-
- #ifndef _IO_fork
- #define _IO_fork vfork /* defined in libiberty, if needed */
- _IO_pid_t _IO_fork(void);
- #endif
-
- #endif /* _IO_HAVE_SYS_WAIT */
-
- #ifndef _IO_pipe
- #define _IO_pipe pipe
- extern int _IO_pipe();
- #endif
-
- #ifndef _IO_dup2
- #define _IO_dup2 dup2
- extern int _IO_dup2();
- #endif
-
- #ifndef _IO_execl
- #define _IO_execl execl
- #endif
- #ifndef _IO__exit
- #define _IO__exit _exit
- #endif
-
- #ifdef TODO
- /* Ditto for signal, sigxxxmask, wait etc */
- #endif
-
- struct _IO_proc_file
- {
- struct _IO_FILE_plus _file;
- /* Following fields must match those in class procbuf (procbuf.h) */
- _IO_pid_t _pid;
- };
- typedef struct _IO_proc_file _IO_proc_file;
-
- _IO_FILE *
- _IO_proc_open(fp, command, mode)
- _IO_FILE* fp;
- const char *command;
- const char *mode;
- {
- #if _IO_HAVE_SYS_WAIT
- int read_or_write;
- int pipe_fds[2];
- int parent_end, child_end;
- _IO_pid_t child_pid;
- if (_IO_file_is_open(fp))
- return NULL;
- if (_IO_pipe(pipe_fds) < 0)
- return NULL;
- if (mode[0] == 'r')
- {
- parent_end = pipe_fds[0];
- child_end = pipe_fds[1];
- read_or_write = _IO_NO_WRITES;
- }
- else
- {
- parent_end = pipe_fds[1];
- child_end = pipe_fds[0];
- read_or_write = _IO_NO_READS;
- }
- ((_IO_proc_file*)fp)->_pid = child_pid = _IO_fork();
- if (child_pid == 0)
- {
- int child_std_end = mode[0] == 'r' ? 1 : 0;
- _IO_close(parent_end);
- if (child_end != child_std_end)
- {
- _IO_dup2(child_end, child_std_end);
- _IO_close(child_end);
- }
- _IO_execl("/bin/sh", "sh", "-c", command, NULL);
- _IO__exit(127);
- }
- _IO_close(child_end);
- if (child_pid < 0)
- {
- _IO_close(parent_end);
- return NULL;
- }
- _IO_fileno(fp) = parent_end;
- fp->_IO_file_flags
- = read_or_write | (fp->_IO_file_flags & ~(_IO_NO_READS|_IO_NO_WRITES));
- return fp;
- #else /* !_IO_HAVE_SYS_WAIT */
- return NULL;
- #endif
- }
-
- _IO_FILE *
- _IO_popen(command, mode)
- const char *command;
- const char *mode;
- {
- _IO_proc_file *fpx = (_IO_proc_file*)malloc(sizeof(_IO_proc_file));
- _IO_FILE *fp = (_IO_FILE*)fpx;
- _IO_init(fp, 0);
- fp->_jumps = &_IO_proc_jumps;
- _IO_file_init(fp);
- if (fp == NULL)
- return NULL;
- ((struct _IO_FILE_plus*)fp)->_vtable = NULL;
- if (_IO_proc_open (fp, command, mode) != NULL)
- return fp;
- free (fpx);
- return NULL;
- }
-
- int
- _IO_proc_close(fp)
- _IO_FILE *fp;
- {
- /* This is not name-space clean. FIXME! */
- #if _IO_HAVE_SYS_WAIT
- int wstatus;
- _IO_pid_t wait_pid;
- int status = _IO_close(_IO_fileno(fp));
- #if defined(SIG_BLOCK) && defined(SIG_SETMASK)
- sigset_t set, oset;
- #endif
- if (status < 0)
- return status;
- #if defined(SIG_BLOCK) && defined(SIG_SETMASK)
- sigemptyset (&set);
- sigaddset (&set, SIGINT);
- sigaddset (&set, SIGQUIT);
- sigaddset (&set, SIGHUP);
- sigprocmask (SIG_BLOCK, &set, &oset);
- #else
- #ifdef USE_SIGMASK
- int mask = sigblock(sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGHUP));
- #else
- typedef void (*void_func)(int);
- void_func intsave = (void_func)signal(SIGINT, SIG_IGN);
- void_func quitsave = (void_func)signal(SIGQUIT, SIG_IGN);
- void_func hupsave = (void_func)signal(SIGHUP, SIG_IGN);
- #endif
- #endif
- while ((wait_pid = wait(&wstatus)) != ((_IO_proc_file*)fp)->_pid
- && wait_pid != -1) { }
- #if defined(SIG_BLOCK) && defined(SIG_SETMASK)
- sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
- #else
- #ifdef USE_SIGMASK
- (void) sigsetmask(mask);
- #else
- signal(SIGINT, intsave);
- signal(SIGQUIT, quitsave);
- signal(SIGHUP, hupsave);
- #endif
- #endif
- if (wait_pid == -1)
- return -1;
- return 0;
- #else /* !_IO_HAVE_SYS_WAIT */
- return -1;
- #endif
- }
-
- struct _IO_jump_t _IO_proc_jumps = {
- _IO_file_overflow,
- _IO_file_underflow,
- _IO_file_xsputn,
- _IO_default_xsgetn,
- _IO_file_read,
- _IO_file_write,
- _IO_file_doallocate,
- _IO_default_pbackfail,
- _IO_file_setbuf,
- _IO_file_sync,
- _IO_file_finish,
- _IO_proc_close,
- _IO_file_stat,
- _IO_file_seek,
- _IO_file_seekoff,
- _IO_default_seekpos,
- };
-