diff options
Diffstat (limited to 'bin/kill')
| -rw-r--r-- | bin/kill/kill.1 | 156 | ||||
| -rw-r--r-- | bin/kill/kill.c | 320 |
2 files changed, 476 insertions, 0 deletions
diff --git a/bin/kill/kill.1 b/bin/kill/kill.1 new file mode 100644 index 0000000..86b05fd --- /dev/null +++ b/bin/kill/kill.1 @@ -0,0 +1,156 @@ +.\" $NetBSD: kill.1,v 1.28 2017/04/22 23:01:36 christos Exp $ +.\" +.\" Copyright (c) 1980, 1990, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" This code is derived from software contributed to Berkeley by +.\" the Institute of Electrical and Electronics Engineers, Inc. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)kill.1 8.2 (Berkeley) 4/28/95 +.\" +.Dd April 22, 2017 +.Dt KILL 1 +.Os +.Sh NAME +.Nm kill +.Nd terminate or signal a process +.Sh SYNOPSIS +.Nm +.Op Fl s Ar signal_name +.Ar pid +\&... +.Nm +.Fl l +.Op Ar exit_status +.Nm +.Fl signal_name +.Ar pid +\&... +.Nm +.Fl signal_number +.Ar pid +\&... +.Sh DESCRIPTION +The +.Nm +utility sends a signal to the process(es) specified +by the pid operand(s). +.Pp +Only the super-user may send signals to other users' processes. +.Pp +The options are as follows: +.Bl -tag -width Ds +.It Fl s Ar signal_name +A symbolic signal name specifying the signal to be sent instead of the +default +.Dv TERM . +.It Fl l Op Ar exit_status +Display the name of the signal corresponding to +.Ar exit_status . +.Ar exit_status +may be the exit status of a command killed by a signal +(see the +special +.Xr sh 1 +parameter +.Sq ?\& ) +or a signal number. +.Pp +If no operand is given, display the names of all the signals. +.It Fl signal_name +A symbolic signal name specifying the signal to be sent instead of the +default +.Dv TERM . +.It Fl signal_number +A non-negative decimal integer, specifying the signal to be sent instead +of the default +.Dv TERM . +.El +.Pp +The following pids have special meanings: +.Bl -tag -width Ds -compact +.It -1 +If superuser, broadcast the signal to all processes; otherwise broadcast +to all processes belonging to the user. +.It 0 +Broadcast the signal to all processes in the current process group +belonging to the user. +.El +.Pp +Some of the more commonly used signals: +.Bl -tag -width Ds -compact +.It 0 +0 (does not affect the process; can be used to test whether the +process exists) +.It 1 +HUP (hang up) +.It 2 +INT (interrupt) +.It 3 +QUIT (quit) +.It 6 +ABRT (abort) +.It 9 +KILL (non-catchable, non-ignorable kill) +.It 14 +ALRM (alarm clock) +.It 15 +TERM (software termination signal) +.El +.Pp +.Nm +is a built-in to +.Xr csh 1 ; +it allows job specifiers of the form ``%...'' as arguments +so process id's are not as often used as +.Nm +arguments. +See +.Xr csh 1 +for details. +.Sh DIAGNOSTICS +.Ex -std +.Sh SEE ALSO +.Xr csh 1 , +.Xr pgrep 1 , +.Xr pkill 1 , +.Xr ps 1 , +.Xr kill 2 , +.Xr sigaction 2 , +.Xr signal 7 +.Sh STANDARDS +The +.Nm +utility is expected to be +.St -p1003.2 +compatible. +.Sh HISTORY +A +.Nm +command appeared in +.At v3 +in section 8 of the manual. diff --git a/bin/kill/kill.c b/bin/kill/kill.c new file mode 100644 index 0000000..6c17cb3 --- /dev/null +++ b/bin/kill/kill.c @@ -0,0 +1,320 @@ +/* $NetBSD: kill.c,v 1.30 2018/12/12 20:22:43 kre Exp $ */ + +/* + * Copyright (c) 1988, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +#if !defined(lint) && !defined(SHELL) +__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\ + The Regents of the University of California. All rights reserved."); +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)kill.c 8.4 (Berkeley) 4/28/95"; +#else +__RCSID("$NetBSD: kill.c,v 1.30 2018/12/12 20:22:43 kre Exp $"); +#endif +#endif /* not lint */ + +#include <ctype.h> +#include <err.h> +#include <errno.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <limits.h> +#include <inttypes.h> +#include <string.h> +#include <termios.h> +#include <unistd.h> +#include <locale.h> +#include <sys/ioctl.h> + +#ifdef SHELL /* sh (aka ash) builtin */ +int killcmd(int, char *argv[]); +#define main killcmd +#include "../../bin/sh/bltin/bltin.h" +#endif /* SHELL */ + +__dead static void nosig(const char *); +void printsignals(FILE *, int); +static int signum(const char *); +static pid_t processnum(const char *); +__dead static void usage(void); + +int +main(int argc, char *argv[]) +{ + int errors; + int numsig; + pid_t pid; + const char *sn; + + setprogname(argv[0]); + setlocale(LC_ALL, ""); + if (argc < 2) + usage(); + + numsig = SIGTERM; + + argc--, argv++; + + /* + * Process exactly 1 option, if there is one. + */ + if (argv[0][0] == '-') { + switch (argv[0][1]) { + case 'l': + if (argv[0][2] != '\0') + sn = argv[0] + 2; + else { + argc--; argv++; + sn = argv[0]; + } + if (argc > 1) + usage(); + if (argc == 1) { + if (isdigit((unsigned char)*sn) == 0) + usage(); + numsig = signum(sn); + if (numsig >= 128) + numsig -= 128; + if (numsig == 0 || signalnext(numsig) == -1) + nosig(sn); + sn = signalname(numsig); + if (sn == NULL) + errx(EXIT_FAILURE, + "unknown signal number: %d", numsig); + printf("%s\n", sn); + exit(0); + } + printsignals(stdout, 0); + exit(0); + + case 's': + if (argv[0][2] != '\0') + sn = argv[0] + 2; + else { + argc--, argv++; + if (argc < 1) { + warnx( + "option requires an argument -- s"); + usage(); + } + sn = argv[0]; + } + if (strcmp(sn, "0") == 0) + numsig = 0; + else if ((numsig = signalnumber(sn)) == 0) { + if (sn != argv[0]) + goto trysignal; + nosig(sn); + } + argc--, argv++; + break; + + case '-': + if (argv[0][2] == '\0') { + /* process this one again later */ + break; + } + /* FALL THROUGH */ + case '\0': + usage(); + break; + + default: + trysignal: + sn = *argv + 1; + if (((numsig = signalnumber(sn)) == 0)) { + if (isdigit((unsigned char)*sn)) + numsig = signum(sn); + else + nosig(sn); + } + + if (numsig != 0 && signalnext(numsig) == -1) + nosig(sn); + argc--, argv++; + break; + } + } + + /* deal with the optional '--' end of options option */ + if (argc > 0 && strcmp(*argv, "--") == 0) + argc--, argv++; + + if (argc == 0) + usage(); + + for (errors = 0; argc; argc--, argv++) { +#ifdef SHELL + extern int getjobpgrp(const char *); + if (*argv[0] == '%') { + pid = getjobpgrp(*argv); + if (pid == 0) { + warnx("illegal job id: %s", *argv); + errors = 1; + continue; + } + } else +#endif + if ((pid = processnum(*argv)) == (pid_t)-1) { + errors = 1; + continue; + } + + if (kill(pid, numsig) == -1) { + warn("%s", *argv); + errors = 1; + } +#ifdef SHELL + /* + * Wakeup the process if it was suspended, so it can + * exit without an explicit 'fg'. + * (kernel handles this for SIGKILL) + */ + if (numsig == SIGTERM || numsig == SIGHUP) + kill(pid, SIGCONT); +#endif + } + + exit(errors); + /* NOTREACHED */ +} + +static int +signum(const char *sn) +{ + intmax_t n; + char *ep; + + n = strtoimax(sn, &ep, 10); + + /* check for correctly parsed number */ + if (*ep || n <= INT_MIN || n >= INT_MAX ) + errx(EXIT_FAILURE, "illegal signal number: %s", sn); + /* NOTREACHED */ + + return (int)n; +} + +static pid_t +processnum(const char *s) +{ + intmax_t n; + char *ep; + + n = strtoimax(s, &ep, 10); + + /* check for correctly parsed number */ + if (*ep || n == INTMAX_MIN || n == INTMAX_MAX || (pid_t)n != n || + n == -1) { + warnx("illegal process%s id: %s", (n < 0 ? " group" : ""), s); + n = -1; + } + + return (pid_t)n; +} + +static void +nosig(const char *name) +{ + + warnx("unknown signal %s; valid signals:", name); + printsignals(stderr, 0); + exit(1); + /* NOTREACHED */ +} + +#ifndef SHELL +/* + * Print the names of all the signals (neatly) to fp + * "len" gives the number of chars already printed to + * the current output line (in kill.c, always 0) + */ +void +printsignals(FILE *fp, int len) +{ + int sig; + int nl, pad; + const char *name; + int termwidth = 80; + + if ((name = getenv("COLUMNS")) != 0) + termwidth = atoi(name); + else if (isatty(fileno(fp))) { + struct winsize win; + + if (ioctl(fileno(fp), TIOCGWINSZ, &win) == 0 && win.ws_col > 0) + termwidth = win.ws_col; + } + + pad = (len | 7) + 1 - len; + + for (sig = 0; (sig = signalnext(sig)) != 0; ) { + name = signalname(sig); + if (name == NULL) + continue; + + nl = strlen(name); + + if (len > 0 && nl + len + pad >= termwidth) { + fprintf(fp, "\n"); + len = 0; + pad = 0; + } else if (pad > 0 && len != 0) + fprintf(fp, "%*s", pad, ""); + else + pad = 0; + + len += nl + pad; + pad = (nl | 7) + 1 - nl; + + fprintf(fp, "%s", name); + } + if (len != 0) + fprintf(fp, "\n"); +} +#endif + +static void +usage(void) +{ + const char *pn = getprogname(); + + fprintf(stderr, "usage: %s [-s signal_name] pid ...\n" + " %s -l [exit_status]\n" + " %s -signal_name pid ...\n" + " %s -signal_number pid ...\n", + pn, pn, pn, pn); + exit(1); + /* NOTREACHED */ +} |