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/* setpgid.c: bash loadable wrapper for setpgid system call
An example of how to wrap a system call with a loadable builtin.
Originally contributed by Jason Vas Dias <jason.vas.dias@gmail.com>
Bash 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.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <errno.h>
#include <string.h>
#include "bashtypes.h"
#include "posixtime.h"
#include <stdio.h>
#include "builtins.h"
#include "shell.h"
#include "common.h"
#include "bashgetopt.h"
#if !defined (_POSIX_VERSION)
# define setpgid(pid, pgrp) setpgrp (pid, pgrp)
#endif
int
setpgid_builtin (list)
WORD_LIST *list;
{
register WORD_LIST *wl;
intmax_t pid_arg, pgid_arg;
pid_t pid, pgid;
char *pidstr, *pgidstr;
wl = list;
pid = pgid = 0;
if (wl == 0 || wl->next == 0)
{
builtin_usage ();
return (EX_USAGE);
}
pidstr = wl->word ? wl->word->word : 0;
pgidstr = wl->next->word ? wl->next->word->word : 0;
if (pidstr == 0 || pgidstr == 0)
{
builtin_usage ();
return (EX_USAGE);
}
if (legal_number (pidstr, &pid_arg) == 0)
{
builtin_error ("%s: pid argument must be numeric", pidstr);
return (EXECUTION_FAILURE);
}
if (pid_arg < 0)
{
builtin_error("%s: negative pid values not allowed", pidstr);
return (EXECUTION_FAILURE);
}
pid = pid_arg;
if (legal_number (pgidstr, &pgid_arg) == 0)
{
builtin_error ("%s: pgrp argument must be numeric", pgidstr);
return (EXECUTION_FAILURE);
}
if (pgid_arg < 0)
{
builtin_error ("%s: negative pgrp values not allowed", pgidstr);
return (EXECUTION_FAILURE);
}
pgid = pgid_arg;
errno = 0;
if (setpgid(pid, pgid) < 0)
{
builtin_error("setpgid failed: %s", strerror (errno));
return (EXECUTION_FAILURE);
}
return (EXECUTION_SUCCESS);
}
const char *setpgid_doc[] = {
"invoke the setpgid(2) system call",
"",
"Arguments:",
" pid : numeric process identifier, >= 0",
" pgrpid: numeric process group identifier, >=0",
"See the setpgid(2) manual page.",
(const char *)NULL
};
struct builtin setpgid_struct = {
"setpgid",
setpgid_builtin,
BUILTIN_ENABLED,
(char **)setpgid_doc,
"setpgid pid pgrpid",
0
};
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