121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
/* setpgid.c: bash loadable wrapper for setpgid system call
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An example of how to wrap a system call with a loadable builtin.
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Originally contributed by Jason Vas Dias <jason.vas.dias@gmail.com>
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include <errno.h>
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#include <string.h>
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#include "bashtypes.h"
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#include "posixtime.h"
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#include <stdio.h>
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#include "builtins.h"
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#include "shell.h"
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#include "common.h"
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#include "bashgetopt.h"
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#if !defined (_POSIX_VERSION)
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# define setpgid(pid, pgrp) setpgrp (pid, pgrp)
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#endif
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int
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setpgid_builtin (list)
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WORD_LIST *list;
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{
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register WORD_LIST *wl;
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intmax_t pid_arg, pgid_arg;
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pid_t pid, pgid;
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char *pidstr, *pgidstr;
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wl = list;
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pid = pgid = 0;
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if (wl == 0 || wl->next == 0)
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{
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builtin_usage ();
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return (EX_USAGE);
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}
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pidstr = wl->word ? wl->word->word : 0;
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pgidstr = wl->next->word ? wl->next->word->word : 0;
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if (pidstr == 0 || pgidstr == 0)
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{
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builtin_usage ();
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return (EX_USAGE);
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}
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if (legal_number (pidstr, &pid_arg) == 0)
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{
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builtin_error ("%s: pid argument must be numeric", pidstr);
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return (EXECUTION_FAILURE);
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}
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if (pid_arg < 0)
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{
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builtin_error("%s: negative pid values not allowed", pidstr);
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return (EXECUTION_FAILURE);
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}
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pid = pid_arg;
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if (legal_number (pgidstr, &pgid_arg) == 0)
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{
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builtin_error ("%s: pgrp argument must be numeric", pgidstr);
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return (EXECUTION_FAILURE);
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}
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if (pgid_arg < 0)
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{
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builtin_error ("%s: negative pgrp values not allowed", pgidstr);
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return (EXECUTION_FAILURE);
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}
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pgid = pgid_arg;
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errno = 0;
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if (setpgid(pid, pgid) < 0)
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{
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builtin_error("setpgid failed: %s", strerror (errno));
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return (EXECUTION_FAILURE);
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}
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return (EXECUTION_SUCCESS);
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}
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const char *setpgid_doc[] = {
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"invoke the setpgid(2) system call",
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"",
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"Arguments:",
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" pid : numeric process identifier, >= 0",
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" pgrpid: numeric process group identifier, >=0",
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"See the setpgid(2) manual page.",
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(const char *)NULL
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};
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struct builtin setpgid_struct = {
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"setpgid",
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setpgid_builtin,
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BUILTIN_ENABLED,
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(char **)setpgid_doc,
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"setpgid pid pgrpid",
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0
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};
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