256 lines
6.9 KiB
C
256 lines
6.9 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. Generic Win32 specialization.
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Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003
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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., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "pex-common.h"
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#include <process.h>
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#include <io.h>
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#include <fcntl.h>
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#include <signal.h>
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/* mingw32 headers may not define the following. */
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#ifndef _P_WAIT
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# define _P_WAIT 0
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# define _P_NOWAIT 1
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# define _P_OVERLAY 2
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# define _P_NOWAITO 3
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# define _P_DETACH 4
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# define WAIT_CHILD 0
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# define WAIT_GRANDCHILD 1
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#endif
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/* This is a kludge to get around the Microsoft C spawn functions' propensity
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to remove the outermost set of double quotes from all arguments. */
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static const char * const *
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fix_argv (argvec)
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char **argvec;
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{
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int i;
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char * command0 = argvec[0];
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/* Ensure that the executable pathname uses Win32 backslashes. This
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is not necessary on NT, but on W9x, forward slashes causes failure
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of spawn* and exec* functions (and probably any function that
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calls CreateProcess) *iff* the executable pathname (argvec[0]) is
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a quoted string. And quoting is necessary in case a pathname
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contains embedded white space. You can't win. */
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for (; *command0 != '\0'; command0++)
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if (*command0 == '/')
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*command0 = '\\';
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for (i = 1; argvec[i] != 0; i++)
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{
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int len, j;
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char *temp, *newtemp;
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temp = argvec[i];
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len = strlen (temp);
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for (j = 0; j < len; j++)
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{
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if (temp[j] == '"')
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{
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newtemp = xmalloc (len + 2);
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strncpy (newtemp, temp, j);
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newtemp [j] = '\\';
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strncpy (&newtemp [j+1], &temp [j], len-j);
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newtemp [len+1] = 0;
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temp = newtemp;
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len++;
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j++;
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}
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}
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argvec[i] = temp;
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}
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for (i = 0; argvec[i] != 0; i++)
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{
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if (strpbrk (argvec[i], " \t"))
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{
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int len, trailing_backslash;
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char *temp;
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len = strlen (argvec[i]);
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trailing_backslash = 0;
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/* There is an added complication when an arg with embedded white
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space ends in a backslash (such as in the case of -iprefix arg
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passed to cpp). The resulting quoted strings gets misinterpreted
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by the command interpreter -- it thinks that the ending quote
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is escaped by the trailing backslash and things get confused.
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We handle this case by escaping the trailing backslash, provided
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it was not escaped in the first place. */
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if (len > 1
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&& argvec[i][len-1] == '\\'
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&& argvec[i][len-2] != '\\')
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{
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trailing_backslash = 1;
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++len; /* to escape the final backslash. */
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}
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len += 2; /* and for the enclosing quotes. */
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temp = xmalloc (len + 1);
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temp[0] = '"';
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strcpy (temp + 1, argvec[i]);
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if (trailing_backslash)
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temp[len-2] = '\\';
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temp[len-1] = '"';
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temp[len] = '\0';
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argvec[i] = temp;
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}
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}
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return (const char * const *) argvec;
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}
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/* Win32 supports pipes */
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int
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pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
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const char *program;
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char * const *argv;
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const char *this_pname ATTRIBUTE_UNUSED;
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const char *temp_base ATTRIBUTE_UNUSED;
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char **errmsg_fmt, **errmsg_arg;
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int flags;
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{
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int pid;
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int pdes[2];
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int org_stdin = -1;
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int org_stdout = -1;
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int input_desc, output_desc;
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/* Pipe waiting from last process, to be used as input for the next one.
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Value is STDIN_FILE_NO if no pipe is waiting
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(i.e. the next command is the first of a group). */
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static int last_pipe_input;
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/* If this is the first process, initialize. */
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if (flags & PEXECUTE_FIRST)
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last_pipe_input = STDIN_FILE_NO;
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input_desc = last_pipe_input;
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/* If this isn't the last process, make a pipe for its output,
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and record it as waiting to be the input to the next process. */
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if (! (flags & PEXECUTE_LAST))
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{
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if (_pipe (pdes, 256, O_BINARY) < 0)
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{
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*errmsg_fmt = "pipe";
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*errmsg_arg = NULL;
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return -1;
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}
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output_desc = pdes[WRITE_PORT];
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last_pipe_input = pdes[READ_PORT];
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}
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else
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{
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/* Last process. */
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output_desc = STDOUT_FILE_NO;
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last_pipe_input = STDIN_FILE_NO;
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}
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if (input_desc != STDIN_FILE_NO)
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{
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org_stdin = dup (STDIN_FILE_NO);
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dup2 (input_desc, STDIN_FILE_NO);
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close (input_desc);
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}
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if (output_desc != STDOUT_FILE_NO)
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{
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org_stdout = dup (STDOUT_FILE_NO);
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dup2 (output_desc, STDOUT_FILE_NO);
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close (output_desc);
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}
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pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv)
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(_P_NOWAIT, program, fix_argv(argv));
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if (input_desc != STDIN_FILE_NO)
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{
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dup2 (org_stdin, STDIN_FILE_NO);
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close (org_stdin);
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}
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if (output_desc != STDOUT_FILE_NO)
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{
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dup2 (org_stdout, STDOUT_FILE_NO);
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close (org_stdout);
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}
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if (pid == -1)
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{
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*errmsg_fmt = install_error_msg;
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*errmsg_arg = (char*) program;
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return -1;
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}
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return pid;
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}
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/* MS CRTDLL doesn't return enough information in status to decide if the
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child exited due to a signal or not, rather it simply returns an
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integer with the exit code of the child; eg., if the child exited with
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an abort() call and didn't have a handler for SIGABRT, it simply returns
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with status = 3. We fix the status code to conform to the usual WIF*
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macros. Note that WIFSIGNALED will never be true under CRTDLL. */
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int
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pwait (pid, status, flags)
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int pid;
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int *status;
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int flags ATTRIBUTE_UNUSED;
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{
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int termstat;
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pid = _cwait (&termstat, pid, WAIT_CHILD);
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/* ??? Here's an opportunity to canonicalize the values in STATUS.
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Needed? */
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/* cwait returns the child process exit code in termstat.
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A value of 3 indicates that the child caught a signal, but not
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which one. Since only SIGABRT, SIGFPE and SIGINT do anything, we
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report SIGABRT. */
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if (termstat == 3)
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*status = SIGABRT;
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else
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*status = (((termstat) & 0xff) << 8);
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return pid;
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}
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