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- This file is kill.def, from which is created kill.c.
- It implements the builtin "kill" in Bash.
-
- Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
-
- This file is part of GNU Bash, the Bourne Again SHell.
-
- 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 1, 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; see the file COPYING. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $PRODUCES kill.c
-
- $BUILTIN kill
- $FUNCTION kill_builtin
- $DEPENDS_ON JOB_CONTROL
- $SHORT_DOC kill [-s sigspec | -sigspec] [pid | job]... | -l [signum]
- Send the processes named by PID (or JOB) the signal SIGSPEC. If
- SIGSPEC is not present, then SIGTERM is assumed. An argument of `-l'
- lists the signal names; if arguments follow `-l' they are assumed to
- be signal numbers for which names should be listed. Kill is a builtin
- for two reasons: it allows job ID's to be used instead of pids, and if
- you run out of processes, you can still kill them.
- $END
-
- #include <sys/types.h>
- #include <errno.h>
- extern int errno;
-
- #include "../shell.h"
- #include "../trap.h"
- #include "../jobs.h"
-
- #if defined (JOB_CONTROL)
- extern int job_control;
-
- #if !defined (CONTINUE_AFTER_KILL_ERROR)
- # define CONTINUE_OR_FAIL return (EXECUTION_FAILURE)
- #else
- # define CONTINUE_OR_FAIL goto continue_killing
- #endif /* CONTINUE_AFTER_KILL_ERROR */
-
- /* Here is the kill builtin. We only have it so that people can type
- kill -KILL %1? No, if you fill up the process table this way you
- can still kill some. */
- int
- kill_builtin (list)
- WORD_LIST *list;
- {
- int signal = SIGTERM;
- int any_succeeded = 0, listing = 0, saw_signal = 0;
- char *sigspec;
- pid_t pid;
-
- if (!list)
- return (EXECUTION_SUCCESS);
-
- /* Process options. */
- while (list)
- {
- if (strcmp (list->word->word, "-l") == 0)
- {
- listing++;
- list = list->next;
- }
- else if (strcmp (list->word->word, "-s") == 0)
- {
- list = list->next;
- if (list)
- {
- sigspec = list->word->word;
- if (strcmp (sigspec, "0") == 0)
- signal = 0;
- else
- signal = decode_signal (sigspec);
- list = list->next;
- }
- else
- {
- builtin_error ("-s requires an argument");
- return (EXECUTION_FAILURE);
- }
- }
- else if (strcmp (list->word->word, "--") == 0)
- {
- list = list->next;
- break;
- }
- /* If this is a signal specification then process it. We only process
- the first one seen; other arguments may signify process groups (e.g,
- -num == process group num). */
- else if ((*(list->word->word) == '-') && !saw_signal)
- {
- sigspec = &(list->word->word)[1];
- signal = decode_signal (sigspec);
- saw_signal++;
- list = list->next;
- }
- else
- break;
- }
-
- if (listing)
- {
- if (!list)
- {
- register int i, column = 0;
- for (i = 1; i < NSIG; i++)
- {
- char *name = signal_name (i);
- if ((strncmp (name, "SIGJUNK", 7) == 0) ||
- (strncmp (name, "Unknown", 7) == 0))
- continue;
-
- printf ("%2d) %s", i, name);
-
- if (++column < 4)
- printf ("\t");
- else
- {
- printf ("\n");
- column = 0;
- }
- }
-
- if (column != 0)
- printf ("\n");
- }
- else
- {
- /* List individual signal names. */
- while (list)
- {
- int signum;
- char *name;
-
- if ((sscanf (list->word->word, "%d", &signum) != 1) ||
- (signum <= 0))
- {
- list_error:
- builtin_error ("bad signal number: %s", list->word->word);
- list = list->next;
- continue;
- }
-
- /* This is specified by Posix.2 so that exit statuses can be
- mapped into signal numbers. */
- if (signum > 128)
- signum -= 128;
-
- if (signum > NSIG)
- goto list_error;
-
- name = signal_name (signum);
- if ((strncmp (name, "SIGJUNK", 7) == 0) ||
- (strncmp (name, "Unknown", 7) == 0))
- {
- list = list->next;
- continue;
- }
- printf ("%s\n", name);
- list = list->next;
- }
- }
- return (EXECUTION_SUCCESS);
- }
-
- /* OK, we are killing processes. */
- if (signal == NO_SIG)
- {
- builtin_error ("bad signal spec `%s'", sigspec);
- return (EXECUTION_FAILURE);
- }
-
- while (list)
- {
- char *word = list->word->word;
-
- if (*word == '-')
- word++;
-
- if (all_digits (word))
- {
- /* Use the entire argument in case of minus sign presence. */
- pid = (pid_t) atoi (list->word->word);
-
- if (kill_pid (pid, signal, 0) < 0)
- goto signal_error;
- else
- any_succeeded++;
- }
- else if (*list->word->word != '%')
- {
- builtin_error ("No such pid %s", list->word->word);
- CONTINUE_OR_FAIL;
- }
- else if (job_control) /* can't kill jobs if not using job control */
- { /* Must be a job spec. Check it out. */
- int job;
- sigset_t set, oset;
-
- BLOCK_CHILD (set, oset);
- job = get_job_spec (list);
-
- if (job < 0 || job >= job_slots || !jobs[job])
- {
- if (job != DUP_JOB)
- builtin_error ("No such job %s", list->word->word);
- UNBLOCK_CHILD (oset);
- CONTINUE_OR_FAIL;
- }
-
- /* Job spec used. Kill the process group. If the job was started
- without job control, then its pgrp == shell_pgrp, so we have
- to be careful. We take the pid of the first job in the pipeline
- in that case. */
- if (jobs[job]->job_control)
- pid = jobs[job]->pgrp;
- else
- pid = jobs[job]->pipe->pid;
-
- UNBLOCK_CHILD (oset);
-
- if (kill_pid (pid, signal, 1) < 0)
- {
- signal_error:
- if (errno == EPERM)
- builtin_error ("(%d) - Not owner", (int)pid);
- else if (errno == ESRCH)
- builtin_error ("(%d) - No such pid", (int)pid);
- else
- builtin_error ("Invalid signal %d", signal);
- CONTINUE_OR_FAIL;
- }
- else
- any_succeeded++;
- }
- else
- {
- builtin_error ("bad process specification `%s'", list->word->word);
- CONTINUE_OR_FAIL;
- }
- continue_killing:
- list = list->next;
- }
-
- if (any_succeeded)
- return (EXECUTION_SUCCESS);
- else
- return (EXECUTION_FAILURE);
- }
- #endif /* JOB_CONTROL */
-