293 lines
6.5 KiB
C
293 lines
6.5 KiB
C
/* Utilities to execute a program in a subprocess (possibly linked by pipes
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with other subprocesses), and wait for it. DJGPP specialization.
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Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005
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Free Software Foundation, Inc.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "pex-common.h"
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#include <stdio.h>
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#include <errno.h>
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#ifdef NEED_DECLARATION_ERRNO
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extern int errno;
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <process.h>
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/* Use ECHILD if available, otherwise use EINVAL. */
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#ifdef ECHILD
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#define PWAIT_ERROR ECHILD
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#else
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#define PWAIT_ERROR EINVAL
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#endif
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static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
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static int pex_djgpp_open_write (struct pex_obj *, const char *, int);
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static long pex_djgpp_exec_child (struct pex_obj *, int, const char *,
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char * const *, char * const *,
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int, int, int,
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const char **, int *);
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static int pex_djgpp_close (struct pex_obj *, int);
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static int pex_djgpp_wait (struct pex_obj *, long, int *, struct pex_time *,
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int, const char **, int *);
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/* The list of functions we pass to the common routines. */
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const struct pex_funcs funcs =
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{
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pex_djgpp_open_read,
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pex_djgpp_open_write,
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pex_djgpp_exec_child,
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pex_djgpp_close,
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pex_djgpp_wait,
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NULL, /* pipe */
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NULL, /* fdopenr */
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NULL, /* fdopenw */
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NULL /* cleanup */
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};
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/* Return a newly initialized pex_obj structure. */
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struct pex_obj *
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pex_init (int flags, const char *pname, const char *tempbase)
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{
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/* DJGPP does not support pipes. */
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flags &= ~ PEX_USE_PIPES;
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return pex_init_common (flags, pname, tempbase, &funcs);
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}
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/* Open a file for reading. */
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static int
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pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
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const char *name, int binary)
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{
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return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
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}
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/* Open a file for writing. */
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static int
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pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
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const char *name, int binary)
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{
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/* Note that we can't use O_EXCL here because gcc may have already
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created the temporary file via make_temp_file. */
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return open (name,
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(O_WRONLY | O_CREAT | O_TRUNC
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| (binary ? O_BINARY : O_TEXT)),
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S_IRUSR | S_IWUSR);
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}
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/* Close a file. */
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static int
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pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
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{
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return close (fd);
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}
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/* Execute a child. */
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static long
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pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
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char * const * argv, char * const * env,
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int in, int out, int errdes,
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const char **errmsg, int *err)
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{
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int org_in, org_out, org_errdes;
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int status;
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int *statuses;
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org_in = -1;
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org_out = -1;
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org_errdes = -1;
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if (in != STDIN_FILE_NO)
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{
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org_in = dup (STDIN_FILE_NO);
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if (org_in < 0)
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{
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*err = errno;
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*errmsg = "dup";
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return -1;
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}
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if (dup2 (in, STDIN_FILE_NO) < 0)
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{
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*err = errno;
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*errmsg = "dup2";
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return -1;
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}
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if (close (in) < 0)
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{
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*err = errno;
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*errmsg = "close";
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return -1;
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}
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}
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if (out != STDOUT_FILE_NO)
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{
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org_out = dup (STDOUT_FILE_NO);
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if (org_out < 0)
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{
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*err = errno;
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*errmsg = "dup";
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return -1;
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}
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if (dup2 (out, STDOUT_FILE_NO) < 0)
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{
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*err = errno;
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*errmsg = "dup2";
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return -1;
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}
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if (close (out) < 0)
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{
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*err = errno;
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*errmsg = "close";
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return -1;
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}
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}
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if (errdes != STDERR_FILE_NO
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|| (flags & PEX_STDERR_TO_STDOUT) != 0)
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{
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org_errdes = dup (STDERR_FILE_NO);
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if (org_errdes < 0)
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{
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*err = errno;
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*errmsg = "dup";
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return -1;
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}
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if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
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STDERR_FILE_NO) < 0)
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{
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*err = errno;
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*errmsg = "dup2";
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return -1;
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}
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if (errdes != STDERR_FILE_NO)
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{
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if (close (errdes) < 0)
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{
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*err = errno;
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*errmsg = "close";
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return -1;
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}
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}
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}
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if (env)
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status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
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(P_WAIT, executable, argv, env));
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else
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status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
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(P_WAIT, executable, argv));
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if (status == -1)
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{
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*err = errno;
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*errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
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}
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if (in != STDIN_FILE_NO)
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{
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if (dup2 (org_in, STDIN_FILE_NO) < 0)
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{
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*err = errno;
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*errmsg = "dup2";
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return -1;
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}
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if (close (org_in) < 0)
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{
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*err = errno;
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*errmsg = "close";
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return -1;
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}
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}
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if (out != STDOUT_FILE_NO)
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{
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if (dup2 (org_out, STDOUT_FILE_NO) < 0)
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{
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*err = errno;
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*errmsg = "dup2";
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return -1;
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}
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if (close (org_out) < 0)
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{
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*err = errno;
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*errmsg = "close";
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return -1;
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}
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}
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if (errdes != STDERR_FILE_NO
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|| (flags & PEX_STDERR_TO_STDOUT) != 0)
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{
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if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
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{
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*err = errno;
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*errmsg = "dup2";
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return -1;
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}
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if (close (org_errdes) < 0)
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{
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*err = errno;
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*errmsg = "close";
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return -1;
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}
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}
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/* Save the exit status for later. When we are called, obj->count
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is the number of children which have executed before this
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one. */
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statuses = (int *) obj->sysdep;
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statuses = XRESIZEVEC (int, statuses, obj->count + 1);
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statuses[obj->count] = status;
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obj->sysdep = (void *) statuses;
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return obj->count;
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}
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/* Wait for a child process to complete. Actually the child process
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has already completed, and we just need to return the exit
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status. */
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static int
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pex_djgpp_wait (struct pex_obj *obj, long pid, int *status,
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struct pex_time *time, int done ATTRIBUTE_UNUSED,
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const char **errmsg ATTRIBUTE_UNUSED,
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int *err ATTRIBUTE_UNUSED)
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{
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int *statuses;
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if (time != NULL)
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memset (time, 0, sizeof *time);
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statuses = (int *) obj->sysdep;
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*status = statuses[pid];
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return 0;
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}
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