316 lines
7.2 KiB
C
316 lines
7.2 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 MSDOS specialization.
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Copyright (C) 1996-2022 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_STRING_H
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#include <string.h>
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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 "safe-ctype.h"
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#include <process.h>
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/* The structure we keep in obj->sysdep. */
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#define PEX_MSDOS_FILE_COUNT 3
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#define PEX_MSDOS_FD_OFFSET 10
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struct pex_msdos
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{
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/* An array of file names. We refer to these using file descriptors
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of 10 + array index. */
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const char *files[PEX_MSDOS_FILE_COUNT];
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/* Exit statuses of programs which have been run. */
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int *statuses;
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};
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static int pex_msdos_open (struct pex_obj *, const char *, int);
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static int pex_msdos_open (struct pex_obj *, const char *, int);
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static int pex_msdos_fdindex (struct pex_msdos *, int);
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static pid_t pex_msdos_exec_child (struct pex_obj *, int, const char *,
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char * const *, char * const *,
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int, int, int, int,
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int, const char **, int *);
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static int pex_msdos_close (struct pex_obj *, int);
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static pid_t pex_msdos_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
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int, const char **, int *);
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static void pex_msdos_cleanup (struct pex_obj *);
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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_msdos_open,
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pex_msdos_open,
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pex_msdos_exec_child,
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pex_msdos_close,
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pex_msdos_wait,
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NULL, /* pipe */
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NULL, /* fdopenr */
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NULL, /* fdopenw */
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pex_msdos_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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struct pex_obj *ret;
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int i;
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/* MSDOS does not support pipes. */
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flags &= ~ PEX_USE_PIPES;
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ret = pex_init_common (flags, pname, tempbase, funcs);
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ret->sysdep = XNEW (struct pex_msdos);
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for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
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ret->files[i] = NULL;
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ret->statuses = NULL;
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return ret;
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}
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/* Open a file. FIXME: We ignore the binary argument, since we have
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no way to handle it. */
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static int
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pex_msdos_open (struct pex_obj *obj, const char *name,
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int binary ATTRIBUTE_UNUSED)
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{
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struct pex_msdos *ms;
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int i;
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ms = (struct pex_msdos *) obj->sysdep;
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for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
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{
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if (ms->files[i] == NULL)
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{
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ms->files[i] = xstrdup (name);
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return i + PEX_MSDOS_FD_OFFSET;
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}
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}
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abort ();
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}
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/* Get the index into msdos->files associated with an open file
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descriptor. */
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static int
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pex_msdos_fdindex (struct pex_msdos *ms, int fd)
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{
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fd -= PEX_MSDOS_FD_OFFSET;
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if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL)
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abort ();
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return fd;
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}
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/* Close a file. */
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static int
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pex_msdos_close (struct pex_obj *obj, int fd)
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{
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struct pex_msdos *ms;
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int fdinex;
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ms = (struct pex_msdos *) obj->sysdep;
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fdindex = pe_msdos_fdindex (ms, fd);
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free (ms->files[fdindex]);
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ms->files[fdindex] = NULL;
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}
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/* Execute a child. */
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static pid_t
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pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable,
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char * const * argv, char * const * env, int in, int out,
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int toclose ATTRIBUTE_UNUSED,
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int errdes ATTRIBUTE_UNUSED, const char **errmsg,
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int *err)
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{
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struct pex_msdos *ms;
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char *temp_base;
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int temp_base_allocated;
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char *rf;
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int inindex;
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char *infile;
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int outindex;
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char *outfile;
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char *scmd;
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FILE *argfile;
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int i;
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int status;
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ms = (struct pex_msdos *) obj->sysdep;
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/* FIXME: I don't know how to redirect stderr, so we ignore ERRDES
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and PEX_STDERR_TO_STDOUT. */
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temp_base = obj->temp_base;
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if (temp_base != NULL)
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temp_base_allocated = 0;
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else
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{
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temp_base = choose_temp_base ();
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temp_base_allocated = 1;
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}
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rf = concat (temp_base, ".gp", NULL);
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if (temp_base_allocated)
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free (temp_base);
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if (in == STDIN_FILE_NO)
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{
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inindex = -1;
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infile = "";
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}
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else
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{
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inindex = pex_msdos_fdindex (ms, in);
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infile = ms->files[inindex];
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}
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if (out == STDOUT_FILE_NO)
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{
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outindex = -1;
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outfile = "";
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}
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else
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{
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outindex = pex_msdos_fdindex (ms, out);
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outfile = ms->files[outindex];
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}
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scmd = XNEWVEC (char, strlen (program)
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+ ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0)
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+ strlen (rf)
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+ strlen (infile)
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+ strlen (outfile)
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+ 10);
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sprintf (scmd, "%s%s @%s%s%s%s%s",
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program,
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(flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "",
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rf,
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inindex != -1 ? " <" : "",
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infile,
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outindex != -1 ? " >" : "",
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outfile);
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argfile = fopen (rf, "w");
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if (argfile == NULL)
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{
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*err = errno;
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free (scmd);
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free (rf);
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*errmsg = "cannot open temporary command file";
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return (pid_t) -1;
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}
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for (i = 1; argv[i] != NULL; ++i)
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{
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char *p;
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for (p = argv[i]; *p != '\0'; ++p)
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{
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if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p))
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putc ('\\', argfile);
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putc (*p, argfile);
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}
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putc ('\n', argfile);
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}
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fclose (argfile);
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status = system (scmd);
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if (status == -1)
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{
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*err = errno;
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remove (rf);
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free (scmd);
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free (rf);
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*errmsg = "system";
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return (pid_t) -1;
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}
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remove (rf);
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free (scmd);
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free (rf);
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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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ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1);
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ms->statuses[obj->count] = status;
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return (pid_t) 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 pid_t
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pex_msdos_wait (struct pex_obj *obj, pid_t 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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struct pex_msdos *ms;
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ms = (struct pex_msdos *) obj->sysdep;
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if (time != NULL)
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memset (time, 0, sizeof *time);
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*status = ms->statuses[pid];
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return 0;
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}
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/* Clean up the pex_msdos structure. */
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static void
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pex_msdos_cleanup (struct pex_obj *obj)
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{
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struct pex_msdos *ms;
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int i;
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ms = (struct pex_msdos *) obj->sysdep;
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for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
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free (msdos->files[i]);
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free (msdos->statuses);
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free (msdos);
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obj->sysdep = NULL;
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}
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