| /* Utilities to execute a program in a subprocess (possibly linked by pipes |
| with other subprocesses), and wait for it. Generic MSDOS specialization. |
| Copyright (C) 1996-2022 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., 51 Franklin Street - Fifth Floor, |
| Boston, MA 02110-1301, 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> |
| |
| /* The structure we keep in obj->sysdep. */ |
| |
| #define PEX_MSDOS_FILE_COUNT 3 |
| |
| #define PEX_MSDOS_FD_OFFSET 10 |
| |
| struct pex_msdos |
| { |
| /* An array of file names. We refer to these using file descriptors |
| of 10 + array index. */ |
| const char *files[PEX_MSDOS_FILE_COUNT]; |
| /* Exit statuses of programs which have been run. */ |
| int *statuses; |
| }; |
| |
| static int pex_msdos_open (struct pex_obj *, const char *, int); |
| static int pex_msdos_open (struct pex_obj *, const char *, int); |
| static int pex_msdos_fdindex (struct pex_msdos *, int); |
| static pid_t pex_msdos_exec_child (struct pex_obj *, int, const char *, |
| char * const *, char * const *, |
| int, int, int, int, |
| int, const char **, int *); |
| static int pex_msdos_close (struct pex_obj *, int); |
| static pid_t pex_msdos_wait (struct pex_obj *, pid_t, int *, struct pex_time *, |
| int, const char **, int *); |
| static void pex_msdos_cleanup (struct pex_obj *); |
| |
| /* The list of functions we pass to the common routines. */ |
| |
| const struct pex_funcs funcs = |
| { |
| pex_msdos_open, |
| pex_msdos_open, |
| pex_msdos_exec_child, |
| pex_msdos_close, |
| pex_msdos_wait, |
| NULL, /* pipe */ |
| NULL, /* fdopenr */ |
| NULL, /* fdopenw */ |
| pex_msdos_cleanup |
| }; |
| |
| /* Return a newly initialized pex_obj structure. */ |
| |
| struct pex_obj * |
| pex_init (int flags, const char *pname, const char *tempbase) |
| { |
| struct pex_obj *ret; |
| int i; |
| |
| /* MSDOS does not support pipes. */ |
| flags &= ~ PEX_USE_PIPES; |
| |
| ret = pex_init_common (flags, pname, tempbase, funcs); |
| |
| ret->sysdep = XNEW (struct pex_msdos); |
| for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i) |
| ret->files[i] = NULL; |
| ret->statuses = NULL; |
| |
| return ret; |
| } |
| |
| /* Open a file. FIXME: We ignore the binary argument, since we have |
| no way to handle it. */ |
| |
| static int |
| pex_msdos_open (struct pex_obj *obj, const char *name, |
| int binary ATTRIBUTE_UNUSED) |
| { |
| struct pex_msdos *ms; |
| int i; |
| |
| ms = (struct pex_msdos *) obj->sysdep; |
| |
| for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i) |
| { |
| if (ms->files[i] == NULL) |
| { |
| ms->files[i] = xstrdup (name); |
| return i + PEX_MSDOS_FD_OFFSET; |
| } |
| } |
| |
| abort (); |
| } |
| |
| /* Get the index into msdos->files associated with an open file |
| descriptor. */ |
| |
| static int |
| pex_msdos_fdindex (struct pex_msdos *ms, int fd) |
| { |
| fd -= PEX_MSDOS_FD_OFFSET; |
| if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL) |
| abort (); |
| return fd; |
| } |
| |
| |
| /* Close a file. */ |
| |
| static int |
| pex_msdos_close (struct pex_obj *obj, int fd) |
| { |
| struct pex_msdos *ms; |
| int fdinex; |
| |
| ms = (struct pex_msdos *) obj->sysdep; |
| fdindex = pe_msdos_fdindex (ms, fd); |
| free (ms->files[fdindex]); |
| ms->files[fdindex] = NULL; |
| } |
| |
| /* Execute a child. */ |
| |
| static pid_t |
| pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable, |
| char * const * argv, char * const * env, int in, int out, |
| int toclose ATTRIBUTE_UNUSED, |
| int errdes ATTRIBUTE_UNUSED, const char **errmsg, |
| int *err) |
| { |
| struct pex_msdos *ms; |
| char *temp_base; |
| int temp_base_allocated; |
| char *rf; |
| int inindex; |
| char *infile; |
| int outindex; |
| char *outfile; |
| char *scmd; |
| FILE *argfile; |
| int i; |
| int status; |
| |
| ms = (struct pex_msdos *) obj->sysdep; |
| |
| /* FIXME: I don't know how to redirect stderr, so we ignore ERRDES |
| and PEX_STDERR_TO_STDOUT. */ |
| |
| temp_base = obj->temp_base; |
| if (temp_base != NULL) |
| temp_base_allocated = 0; |
| else |
| { |
| temp_base = choose_temp_base (); |
| temp_base_allocated = 1; |
| } |
| |
| rf = concat (temp_base, ".gp", NULL); |
| |
| if (temp_base_allocated) |
| free (temp_base); |
| |
| if (in == STDIN_FILE_NO) |
| { |
| inindex = -1; |
| infile = ""; |
| } |
| else |
| { |
| inindex = pex_msdos_fdindex (ms, in); |
| infile = ms->files[inindex]; |
| } |
| |
| if (out == STDOUT_FILE_NO) |
| { |
| outindex = -1; |
| outfile = ""; |
| } |
| else |
| { |
| outindex = pex_msdos_fdindex (ms, out); |
| outfile = ms->files[outindex]; |
| } |
| |
| scmd = XNEWVEC (char, strlen (program) |
| + ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0) |
| + strlen (rf) |
| + strlen (infile) |
| + strlen (outfile) |
| + 10); |
| sprintf (scmd, "%s%s @%s%s%s%s%s", |
| program, |
| (flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "", |
| rf, |
| inindex != -1 ? " <" : "", |
| infile, |
| outindex != -1 ? " >" : "", |
| outfile); |
| |
| argfile = fopen (rf, "w"); |
| if (argfile == NULL) |
| { |
| *err = errno; |
| free (scmd); |
| free (rf); |
| *errmsg = "cannot open temporary command file"; |
| return (pid_t) -1; |
| } |
| |
| for (i = 1; argv[i] != NULL; ++i) |
| { |
| char *p; |
| |
| for (p = argv[i]; *p != '\0'; ++p) |
| { |
| if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p)) |
| putc ('\\', argfile); |
| putc (*p, argfile); |
| } |
| putc ('\n', argfile); |
| } |
| |
| fclose (argfile); |
| |
| status = system (scmd); |
| |
| if (status == -1) |
| { |
| *err = errno; |
| remove (rf); |
| free (scmd); |
| free (rf); |
| *errmsg = "system"; |
| return (pid_t) -1; |
| } |
| |
| remove (rf); |
| free (scmd); |
| free (rf); |
| |
| /* Save the exit status for later. When we are called, obj->count |
| is the number of children which have executed before this |
| one. */ |
| ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1); |
| ms->statuses[obj->count] = status; |
| |
| return (pid_t) obj->count; |
| } |
| |
| /* Wait for a child process to complete. Actually the child process |
| has already completed, and we just need to return the exit |
| status. */ |
| |
| static pid_t |
| pex_msdos_wait (struct pex_obj *obj, pid_t pid, int *status, |
| struct pex_time *time, int done ATTRIBUTE_UNUSED, |
| const char **errmsg ATTRIBUTE_UNUSED, |
| int *err ATTRIBUTE_UNUSED) |
| { |
| struct pex_msdos *ms; |
| |
| ms = (struct pex_msdos *) obj->sysdep; |
| |
| if (time != NULL) |
| memset (time, 0, sizeof *time); |
| |
| *status = ms->statuses[pid]; |
| |
| return 0; |
| } |
| |
| /* Clean up the pex_msdos structure. */ |
| |
| static void |
| pex_msdos_cleanup (struct pex_obj *obj) |
| { |
| struct pex_msdos *ms; |
| int i; |
| |
| ms = (struct pex_msdos *) obj->sysdep; |
| for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i) |
| free (msdos->files[i]); |
| free (msdos->statuses); |
| free (msdos); |
| obj->sysdep = NULL; |
| } |