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/* Utilities to execute a program in a subprocess (possibly linked by pipes
with other subprocesses), and wait for it. DJGPP specialization.
Copyright (C) 1996-2021 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_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <process.h>
/* Use ECHILD if available, otherwise use EINVAL. */
#ifdef ECHILD
#define PWAIT_ERROR ECHILD
#else
#define PWAIT_ERROR EINVAL
#endif
static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int);
static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *,
char * const *, char * const *,
int, int, int, int,
const char **, int *);
static int pex_djgpp_close (struct pex_obj *, int);
static pid_t pex_djgpp_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
int, const char **, int *);
/* The list of functions we pass to the common routines. */
const struct pex_funcs funcs =
{
pex_djgpp_open_read,
pex_djgpp_open_write,
pex_djgpp_exec_child,
pex_djgpp_close,
pex_djgpp_wait,
NULL, /* pipe */
NULL, /* fdopenr */
NULL, /* fdopenw */
NULL /* cleanup */
};
/* Return a newly initialized pex_obj structure. */
struct pex_obj *
pex_init (int flags, const char *pname, const char *tempbase)
{
/* DJGPP does not support pipes. */
flags &= ~ PEX_USE_PIPES;
return pex_init_common (flags, pname, tempbase, &funcs);
}
/* Open a file for reading. */
static int
pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
const char *name, int binary)
{
return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
}
/* Open a file for writing. */
static int
pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
const char *name, int binary, int append)
{
/* Note that we can't use O_EXCL here because gcc may have already
created the temporary file via make_temp_file. */
if (append)
return -1;
return open (name,
(O_WRONLY | O_CREAT | O_TRUNC
| (binary ? O_BINARY : O_TEXT)),
S_IRUSR | S_IWUSR);
}
/* Close a file. */
static int
pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
{
return close (fd);
}
/* Execute a child. */
static pid_t
pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
char * const * argv, char * const * env,
int in, int out, int errdes,
int toclose ATTRIBUTE_UNUSED, const char **errmsg,
int *err)
{
int org_in, org_out, org_errdes;
int status;
int *statuses;
org_in = -1;
org_out = -1;
org_errdes = -1;
if (in != STDIN_FILE_NO)
{
org_in = dup (STDIN_FILE_NO);
if (org_in < 0)
{
*err = errno;
*errmsg = "dup";
return (pid_t) -1;
}
if (dup2 (in, STDIN_FILE_NO) < 0)
{
*err = errno;
*errmsg = "dup2";
return (pid_t) -1;
}
if (close (in) < 0)
{
*err = errno;
*errmsg = "close";
return (pid_t) -1;
}
}
if (out != STDOUT_FILE_NO)
{
org_out = dup (STDOUT_FILE_NO);
if (org_out < 0)
{
*err = errno;
*errmsg = "dup";
return (pid_t) -1;
}
if (dup2 (out, STDOUT_FILE_NO) < 0)
{
*err = errno;
*errmsg = "dup2";
return (pid_t) -1;
}
if (close (out) < 0)
{
*err = errno;
*errmsg = "close";
return (pid_t) -1;
}
}
if (errdes != STDERR_FILE_NO
|| (flags & PEX_STDERR_TO_STDOUT) != 0)
{
org_errdes = dup (STDERR_FILE_NO);
if (org_errdes < 0)
{
*err = errno;
*errmsg = "dup";
return (pid_t) -1;
}
if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
STDERR_FILE_NO) < 0)
{
*err = errno;
*errmsg = "dup2";
return (pid_t) -1;
}
if (errdes != STDERR_FILE_NO)
{
if (close (errdes) < 0)
{
*err = errno;
*errmsg = "close";
return (pid_t) -1;
}
}
}
if (env)
status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
(P_WAIT, executable, argv, env));
else
status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
(P_WAIT, executable, argv));
if (status == -1)
{
*err = errno;
*errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
}
if (in != STDIN_FILE_NO)
{
if (dup2 (org_in, STDIN_FILE_NO) < 0)
{
*err = errno;
*errmsg = "dup2";
return (pid_t) -1;
}
if (close (org_in) < 0)
{
*err = errno;
*errmsg = "close";
return (pid_t) -1;
}
}
if (out != STDOUT_FILE_NO)
{
if (dup2 (org_out, STDOUT_FILE_NO) < 0)
{
*err = errno;
*errmsg = "dup2";
return (pid_t) -1;
}
if (close (org_out) < 0)
{
*err = errno;
*errmsg = "close";
return (pid_t) -1;
}
}
if (errdes != STDERR_FILE_NO
|| (flags & PEX_STDERR_TO_STDOUT) != 0)
{
if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
{
*err = errno;
*errmsg = "dup2";
return (pid_t) -1;
}
if (close (org_errdes) < 0)
{
*err = errno;
*errmsg = "close";
return (pid_t) -1;
}
}
/* Save the exit status for later. When we are called, obj->count
is the number of children which have executed before this
one. */
statuses = (int *) obj->sysdep;
statuses = XRESIZEVEC (int, statuses, obj->count + 1);
statuses[obj->count] = status;
obj->sysdep = (void *) statuses;
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_djgpp_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)
{
int *statuses;
if (time != NULL)
memset (time, 0, sizeof *time);
statuses = (int *) obj->sysdep;
*status = statuses[pid];
return 0;
}
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