Viewing file:  pex-msdos.c (7.16 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* 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;
}
|
