| 1 | /* Utilities to execute a program in a subprocess (possibly linked by pipes |
| 2 | with other subprocesses), and wait for it. Generic MSDOS specialization. |
| 3 | Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of the libiberty library. |
| 7 | Libiberty is free software; you can redistribute it and/or |
| 8 | modify it under the terms of the GNU Library General Public |
| 9 | License as published by the Free Software Foundation; either |
| 10 | version 2 of the License, or (at your option) any later version. |
| 11 | |
| 12 | Libiberty is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | Library General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU Library General Public |
| 18 | License along with libiberty; see the file COPYING.LIB. If not, |
| 19 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "pex-common.h" |
| 23 | |
| 24 | #include <stdio.h> |
| 25 | #include <errno.h> |
| 26 | #ifdef NEED_DECLARATION_ERRNO |
| 27 | extern int errno; |
| 28 | #endif |
| 29 | #ifdef HAVE_STRING_H |
| 30 | #include <string.h> |
| 31 | #endif |
| 32 | #ifdef HAVE_STDLIB_H |
| 33 | #include <stdlib.h> |
| 34 | #endif |
| 35 | |
| 36 | #include "safe-ctype.h" |
| 37 | #include <process.h> |
| 38 | |
| 39 | /* MSDOS doesn't multitask, but for the sake of a consistent interface |
| 40 | the code behaves like it does. pexecute runs the program, tucks the |
| 41 | exit code away, and returns a "pid". pwait must be called to fetch the |
| 42 | exit code. */ |
| 43 | |
| 44 | /* For communicating information from pexecute to pwait. */ |
| 45 | static int last_pid = 0; |
| 46 | static int last_status = 0; |
| 47 | static int last_reaped = 0; |
| 48 | |
| 49 | int |
| 50 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| 51 | const char *program; |
| 52 | char * const *argv; |
| 53 | const char *this_pname; |
| 54 | const char *temp_base; |
| 55 | char **errmsg_fmt, **errmsg_arg; |
| 56 | int flags; |
| 57 | { |
| 58 | int rc; |
| 59 | char *scmd, *rf; |
| 60 | FILE *argfile; |
| 61 | int i, el = flags & PEXECUTE_SEARCH ? 4 : 0; |
| 62 | |
| 63 | last_pid++; |
| 64 | if (last_pid < 0) |
| 65 | last_pid = 1; |
| 66 | |
| 67 | if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE) |
| 68 | abort (); |
| 69 | |
| 70 | if (temp_base == 0) |
| 71 | temp_base = choose_temp_base (); |
| 72 | scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el); |
| 73 | rf = scmd + strlen(program) + 2 + el; |
| 74 | sprintf (scmd, "%s%s @%s.gp", program, |
| 75 | (flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base); |
| 76 | argfile = fopen (rf, "w"); |
| 77 | if (argfile == 0) |
| 78 | { |
| 79 | int errno_save = errno; |
| 80 | free (scmd); |
| 81 | errno = errno_save; |
| 82 | *errmsg_fmt = "cannot open `%s.gp'"; |
| 83 | *errmsg_arg = temp_base; |
| 84 | return -1; |
| 85 | } |
| 86 | |
| 87 | for (i=1; argv[i]; i++) |
| 88 | { |
| 89 | char *cp; |
| 90 | for (cp = argv[i]; *cp; cp++) |
| 91 | { |
| 92 | if (*cp == '"' || *cp == '\'' || *cp == '\\' || ISSPACE (*cp)) |
| 93 | fputc ('\\', argfile); |
| 94 | fputc (*cp, argfile); |
| 95 | } |
| 96 | fputc ('\n', argfile); |
| 97 | } |
| 98 | fclose (argfile); |
| 99 | |
| 100 | rc = system (scmd); |
| 101 | |
| 102 | { |
| 103 | int errno_save = errno; |
| 104 | remove (rf); |
| 105 | free (scmd); |
| 106 | errno = errno_save; |
| 107 | } |
| 108 | |
| 109 | if (rc == -1) |
| 110 | { |
| 111 | *errmsg_fmt = install_error_msg; |
| 112 | *errmsg_arg = (char *)program; |
| 113 | return -1; |
| 114 | } |
| 115 | |
| 116 | /* Tuck the status away for pwait, and return a "pid". */ |
| 117 | last_status = rc << 8; |
| 118 | return last_pid; |
| 119 | } |
| 120 | |
| 121 | /* Use ECHILD if available, otherwise use EINVAL. */ |
| 122 | #ifdef ECHILD |
| 123 | #define PWAIT_ERROR ECHILD |
| 124 | #else |
| 125 | #define PWAIT_ERROR EINVAL |
| 126 | #endif |
| 127 | |
| 128 | int |
| 129 | pwait (pid, status, flags) |
| 130 | int pid; |
| 131 | int *status; |
| 132 | int flags; |
| 133 | { |
| 134 | /* On MSDOS each pexecute must be followed by its associated pwait. */ |
| 135 | if (pid != last_pid |
| 136 | /* Called twice for the same child? */ |
| 137 | || pid == last_reaped) |
| 138 | { |
| 139 | errno = PWAIT_ERROR; |
| 140 | return -1; |
| 141 | } |
| 142 | /* ??? Here's an opportunity to canonicalize the values in STATUS. |
| 143 | Needed? */ |
| 144 | *status = last_status; |
| 145 | last_reaped = last_pid; |
| 146 | return last_pid; |
| 147 | } |