303 lines
7.0 KiB
C
303 lines
7.0 KiB
C
/*
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* Copyright (c) 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* kill.c
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* Terminate or signal processes.
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*/
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#include <sys/types.h>
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#include <ctype.h>
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#include <errno.h>
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#include <error.h>
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#include <inttypes.h>
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#include <locale.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static const char* signames[128] =
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{
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[0] = NULL,
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[SIGHUP] = "HUP",
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[SIGINT] = "INT",
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[SIGQUIT] = "QUIT",
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[SIGILL] = "ILL",
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[SIGTRAP] = "TRAP",
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[SIGABRT] = "ABRT",
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[SIGBUS] = "BUS",
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[SIGFPE] = "FPE",
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[SIGKILL] = "KILL",
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[SIGUSR1] = "USR1",
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[SIGSEGV] = "SEGV",
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[SIGUSR2] = "USR2",
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[SIGPIPE] = "PIPE",
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[SIGALRM] = "ALRM",
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[SIGTERM] = "TERM",
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[SIGSYS] = "SYS",
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[SIGCHLD] = "CHLD",
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[SIGCONT] = "CONT",
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[SIGSTOP] = "STOP",
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[SIGTSTP] = "TSTP",
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[SIGTTIN] = "TTIN",
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[SIGTTOU] = "TTOU",
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[SIGURG] = "URG",
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[SIGXCPU] = "XCPU",
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[SIGXFSZ] = "XFSZ",
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[SIGVTALRM] = "VTALRM",
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[SIGPWR] = "PWR",
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[SIGWINCH] = "WINCH",
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};
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__attribute__((constructor))
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static void signames_init(void)
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{
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static char sigrtnames[SIGRTMAX - SIGRTMIN + 1][10];
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int rtnum = SIGRTMAX - SIGRTMIN + 1;
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for ( int i = 0; i < rtnum; i++ )
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{
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char* name = sigrtnames[i];
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size_t name_size = sizeof(sigrtnames[i]);
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if ( i == SIGRTMIN )
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name = (char*) "RTMIN";
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else if ( i == SIGRTMIN )
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name = (char*) "RTMAX";
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else if ( i < rtnum / 2 )
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snprintf(name, name_size, "RTMIN+%i", i);
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else
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snprintf(name, name_size, "RTMAX-%i", SIGRTMAX - i);
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signames[SIGRTMIN + i] = name;
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}
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}
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static bool parse_signum(int* signumptr, const char* str)
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{
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if ( !isdigit((unsigned char) str[0]) )
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return false;
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char* end;
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errno = 0;
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long l = strtol((char*) str, &end, 10);
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if ( end[0] )
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return false;
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if ( errno == ERANGE || l != (int) l)
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return false;
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if ( l < 0 || 128 <= l )
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return false;
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*signumptr = (int) l;
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return true;
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}
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static pid_t parse_pid(pid_t* pidptr, const char* str)
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{
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if ( !isdigit((unsigned char) str[0]) )
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return false;
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char* end;
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errno = 0;
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intmax_t imax = strtoimax((char*) str, &end, 10);
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if ( end[0] )
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return false;
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if ( errno == ERANGE || imax != (pid_t) imax )
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return false;
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*pidptr = (pid_t) imax;
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return true;
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}
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static const char* exit_status_to_signame(int status)
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{
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if ( 0 <= status && status <= 127 )
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return signames[status];
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if ( 128 <= status && status <= 255 )
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return signames[status - 128];
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return NULL;
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}
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static int signame_to_signum(const char* name)
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{
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int signum;
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if ( parse_signum(&signum, name) )
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return signum;
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for ( int i = 0; i < 128; i++ )
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if ( signames[i] && !strcmp(signames[i], name) )
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return i;
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return -1;
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}
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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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static void help(FILE* fp, const char* argv0)
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{
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fprintf(fp, "Usage: %s [OPTION]... PID...\n", argv0);
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fprintf(fp, "Terminate or signal processes by pid.\n");
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fprintf(fp, "\n");
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fprintf(fp, " -l, --list list all signal names, or convert one to a name\n");
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fprintf(fp, " -s, --signal=SIGNAL specify signal to be sent\n");
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fprintf(fp, " --help display this help and exit\n");
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fprintf(fp, " --version output version information and exit\n");
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}
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static void version(FILE* fp, const char* argv0)
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{
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fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
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}
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int main(int argc, char* argv[])
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{
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setlocale(LC_ALL, "");
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bool list = false;
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const char* signal = NULL;
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const char* argv0 = argv[0];
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( isupper((unsigned char) arg[1]) ||
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isdigit((unsigned char) arg[1]) )
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signal = arg + 1;
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else if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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case 'l': list = true; break;
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case 's':
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if ( !*(signal = arg + 1) )
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{
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if ( i + 1 == argc )
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{
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error(0, 0, "option requires an argument -- 's'");
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fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
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exit(125);
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}
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signal = argv[i+1];
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argv[++i] = NULL;
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}
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arg = "s";
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break;
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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help(stderr, argv0);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--help") )
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list = true;
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else if ( !strncmp(arg, "--signal=", strlen("--signal=")) )
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signal = arg + strlen("--signal=");
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else if ( !strcmp(arg, "--signal") )
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{
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if ( i + 1 == argc )
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{
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error(0, 0, "option '--signal' requires an argument");
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fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
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exit(125);
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}
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signal = argv[i+1];
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argv[++i] = NULL;
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}
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else if ( !strcmp(arg, "--help") )
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help(stdout, argv0), exit(0);
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else if ( !strcmp(arg, "--version") )
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version(stdout, argv0), exit(0);
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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help(stderr, argv0);
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exit(1);
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}
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}
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compact_arguments(&argc, &argv);
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if ( signal && list )
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error(1, 0, "options --signal and --list are mutually incompatible");
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if ( list && argc == 1 )
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{
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const char* prefix = "";
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for ( int i = 0; i < 128; i++ )
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{
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if ( !signames[i] )
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continue;
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if ( SIGRTMIN < i && i < SIGRTMAX )
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continue;
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printf("%s%s", prefix, signames[i]);
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prefix = " ";
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}
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printf("\n");
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return ferror(stdout) || fflush(stdout) == EOF ? 1 : 0;
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}
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else if ( list )
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{
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int result = 0;
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for ( int i = 1; i < argc; i++ )
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{
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int exit_status = atoi(argv[i]);
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const char* name = exit_status_to_signame(exit_status);
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if ( name )
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printf("%s\n", name);
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else
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result = 1;
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}
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return ferror(stdout) || fflush(stdout) == EOF ? 1 : result;
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}
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else
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{
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if ( argc == 1)
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{
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fprintf(stderr, "%s: missing operand\n", argv0);
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help(stderr, argv0);
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exit(1);
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}
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if ( !signal )
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signal = "TERM";
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int signum = signame_to_signum(signal);
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if ( signum < 0 )
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error(1, 0, "invalid signal: %s", signal);
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int result = 0;
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for ( int i = 1; i < argc; i++ )
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{
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pid_t pid = 0;
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if ( !parse_pid(&pid, argv[i]) )
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error(1, 0, "invalid process identifier: %s", argv[i]);
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if ( kill(pid, signum) < 0 )
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{
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error(0, errno, "kill: (%" PRIiPID ")", pid);
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result = 1;
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}
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}
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return result;
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}
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}
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