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-rw-r--r--libiberty/pex-msdos.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/libiberty/pex-msdos.c b/libiberty/pex-msdos.c
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+++ b/libiberty/pex-msdos.c
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+/* Utilities to execute a program in a subprocess (possibly linked by pipes
+ with other subprocesses), and wait for it. Generic MSDOS specialization.
+ Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003
+ Free Software Foundation, Inc.
+
+This file is part of the libiberty library.
+Libiberty is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+Libiberty 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with libiberty; see the file COPYING.LIB. If not,
+write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#include "pex-common.h"
+
+#include <stdio.h>
+#include <errno.h>
+#ifdef NEED_DECLARATION_ERRNO
+extern int errno;
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+#include "safe-ctype.h"
+#include <process.h>
+
+/* MSDOS doesn't multitask, but for the sake of a consistent interface
+ the code behaves like it does. pexecute runs the program, tucks the
+ exit code away, and returns a "pid". pwait must be called to fetch the
+ exit code. */
+
+/* For communicating information from pexecute to pwait. */
+static int last_pid = 0;
+static int last_status = 0;
+static int last_reaped = 0;
+
+int
+pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
+ const char *program;
+ char * const *argv;
+ const char *this_pname;
+ const char *temp_base;
+ char **errmsg_fmt, **errmsg_arg;
+ int flags;
+{
+ int rc;
+ char *scmd, *rf;
+ FILE *argfile;
+ int i, el = flags & PEXECUTE_SEARCH ? 4 : 0;
+
+ last_pid++;
+ if (last_pid < 0)
+ last_pid = 1;
+
+ if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
+ abort ();
+
+ if (temp_base == 0)
+ temp_base = choose_temp_base ();
+ scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el);
+ rf = scmd + strlen(program) + 2 + el;
+ sprintf (scmd, "%s%s @%s.gp", program,
+ (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base);
+ argfile = fopen (rf, "w");
+ if (argfile == 0)
+ {
+ int errno_save = errno;
+ free (scmd);
+ errno = errno_save;
+ *errmsg_fmt = "cannot open `%s.gp'";
+ *errmsg_arg = temp_base;
+ return -1;
+ }
+
+ for (i=1; argv[i]; i++)
+ {
+ char *cp;
+ for (cp = argv[i]; *cp; cp++)
+ {
+ if (*cp == '"' || *cp == '\'' || *cp == '\\' || ISSPACE (*cp))
+ fputc ('\\', argfile);
+ fputc (*cp, argfile);
+ }
+ fputc ('\n', argfile);
+ }
+ fclose (argfile);
+
+ rc = system (scmd);
+
+ {
+ int errno_save = errno;
+ remove (rf);
+ free (scmd);
+ errno = errno_save;
+ }
+
+ if (rc == -1)
+ {
+ *errmsg_fmt = install_error_msg;
+ *errmsg_arg = (char *)program;
+ return -1;
+ }
+
+ /* Tuck the status away for pwait, and return a "pid". */
+ last_status = rc << 8;
+ return last_pid;
+}
+
+/* Use ECHILD if available, otherwise use EINVAL. */
+#ifdef ECHILD
+#define PWAIT_ERROR ECHILD
+#else
+#define PWAIT_ERROR EINVAL
+#endif
+
+int
+pwait (pid, status, flags)
+ int pid;
+ int *status;
+ int flags;
+{
+ /* On MSDOS each pexecute must be followed by its associated pwait. */
+ if (pid != last_pid
+ /* Called twice for the same child? */
+ || pid == last_reaped)
+ {
+ errno = PWAIT_ERROR;
+ return -1;
+ }
+ /* ??? Here's an opportunity to canonicalize the values in STATUS.
+ Needed? */
+ *status = last_status;
+ last_reaped = last_pid;
+ return last_pid;
+}