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/* Auxiliary functions for the creation of subprocesses. OS/2 kLIBC API.
Copyright (C) 2001, 2003-2020 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2003.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "os2-spawn.h"
/* Get _open_osfhandle(). */
#include <io.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "cloexec.h"
#include "error.h"
#include "gettext.h"
#define _(str) gettext (str)
/* Duplicates a file handle, making the copy uninheritable.
Returns -1 for a file handle that is equivalent to closed. */
static int
dup_noinherit (int fd)
{
fd = dup_cloexec (fd);
if (fd < 0 && errno == EMFILE)
error (EXIT_FAILURE, errno, _("_open_osfhandle failed"));
return fd;
}
/* Returns a file descriptor equivalent to FD, except that the resulting file
descriptor is none of STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO.
FD must be open and non-inheritable. The result will be non-inheritable as
well.
If FD < 0, FD itself is returned. */
static int
fd_safer_noinherit (int fd)
{
if (STDIN_FILENO <= fd && fd <= STDERR_FILENO)
{
/* The recursion depth is at most 3. */
int nfd = fd_safer_noinherit (dup_noinherit (fd));
int saved_errno = errno;
close (fd);
errno = saved_errno;
return nfd;
}
return fd;
}
int
dup_safer_noinherit (int fd)
{
return fd_safer_noinherit (dup_noinherit (fd));
}
void
undup_safer_noinherit (int tempfd, int origfd)
{
if (tempfd >= 0)
{
if (dup2 (tempfd, origfd) < 0)
error (EXIT_FAILURE, errno, _("cannot restore fd %d: dup2 failed"),
origfd);
close (tempfd);
}
else
{
/* origfd was closed or open to no handle at all. Set it to a closed
state. This is (nearly) equivalent to the original state. */
close (origfd);
}
}
const char **
prepare_spawn (const char * const *argv, char **mem_to_free)
{
size_t argc;
const char **new_argv;
size_t i;
/* Count number of arguments. */
for (argc = 0; argv[argc] != NULL; argc++)
;
/* Allocate new argument vector. */
new_argv = (const char **) malloc ((1 + argc + 1) * sizeof (const char *));
if (new_argv == NULL)
return NULL;
/* Add an element upfront that can be used when argv[0] turns out to be a
script, not a program.
On Unix, this would be "/bin/sh". */
new_argv[0] = "sh.exe";
/* Put quoted arguments into the new argument vector. */
size_t needed_size = 0;
for (i = 0; i < argc; i++)
{
const char *string = argv[i];
const char *quoted_string = (string[0] == '\0' ? "\"\"" : string);
size_t length = strlen (quoted_string);
needed_size += length + 1;
}
char *mem;
if (needed_size == 0)
mem = NULL;
else
{
mem = (char *) malloc (needed_size);
if (mem == NULL)
{
/* Memory allocation failure. */
free (new_argv);
errno = ENOMEM;
return NULL;
}
}
*mem_to_free = mem;
for (i = 0; i < argc; i++)
{
const char *string = argv[i];
new_argv[1 + i] = mem;
const char *quoted_string = (string[0] == '\0' ? "\"\"" : string);
size_t length = strlen (quoted_string);
memcpy (mem, quoted_string, length + 1);
mem += length + 1;
}
new_argv[1 + argc] = NULL;
return new_argv;
}
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