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| -rw-r--r-- | kill.c | 148 |
1 files changed, 148 insertions, 0 deletions
@@ -0,0 +1,148 @@ +/* + * UNG's Not GNU + * + * Copyright (c) 2011-2020, Jakob Kaivo <jkk@ung.org> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + */ + +#define _XOPEN_SOURCE 700 +#include <ctype.h> +#include <errno.h> +#include <locale.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <strings.h> +#include <signal.h> +#include <unistd.h> + +#define OFFSET_OF_EXIT_STATUS 128 + +static struct { + char *name; + int num; +} ksigs[] = { + { "0", 0 }, + { "1", SIGHUP }, + { "2", SIGINT }, + { "3", SIGQUIT }, + { "6", SIGABRT }, + { "9", SIGKILL }, + { "14", SIGALRM }, + { "15", SIGTERM }, + + { "ABRT", SIGABRT }, + { "ALRM", SIGALRM }, + { "BUS", SIGBUS }, + { "CHLD", SIGCHLD }, + { "CONT", SIGCONT }, + { "FPE", SIGFPE }, + { "HUP", SIGHUP }, + { "ILL", SIGILL }, + { "INT", SIGINT }, + { "KILL", SIGKILL }, + { "PIPE", SIGPIPE }, + { "QUIT", SIGQUIT }, + { "SEGV", SIGSEGV }, + { "STOP", SIGSTOP }, + { "TERM", SIGTERM }, + { "TSTP", SIGTSTP }, + { "TTIN", SIGTTIN }, + { "TTOU", SIGTTOU }, + { "USR1", SIGUSR1 }, + { "USR2", SIGUSR2 }, + { "POLL", SIGPOLL }, + { "PROF", SIGPROF }, + { "SYS", SIGSYS }, + { "TRAP", SIGTRAP }, + { "URG", SIGURG }, + { "VTALRM", SIGVTALRM }, + { "XCPU", SIGXCPU }, + { "XFSZ", SIGXFSZ }, +}; +static size_t nsigs = sizeof(ksigs) / sizeof(ksigs[0]); + +static int kill_list(int status) +{ + for (size_t i = 1; i < nsigs; i++) { + if (isdigit(ksigs[i].name[0])) { + continue; + } + + if (status == -1 || status == ksigs[i].num) { + printf("%s", ksigs[i].name); + if (status == -1 && i != nsigs - 1) { + putchar(' '); + } + } + } + putchar('\n'); + return 0; +} + +int main(int argc, char *argv[]) +{ + setlocale(LC_ALL, ""); + + char *signame = "TERM"; + int list = 0; + + /* TODO: insert -s to support XSI -signal_name and -signal_number */ + + int c; + while ((c = getopt(argc, argv, "s:l")) != -1) { + switch (c) { + case 's': /** send signal [signal_name] **/ + signame = optarg; + break; + + case 'l': /** list signal names **/ + list = 1; + break; + + default: + return 1; + } + } + + if (list) { + int exit_status = -1; + if (argc > optind) { + exit_status = atoi(argv[optind]); + exit_status -= OFFSET_OF_EXIT_STATUS; + } + return kill_list(exit_status); + } + + if (argc <= optind) { + fprintf(stderr, "kill: missing operand\n"); + return 1; + } + + int pid = atoi(argv[optind]); + + for (size_t i = 0; i < nsigs; i++) { + if (!strcasecmp(signame, ksigs[i].name)) { + if (kill(pid, ksigs[i].num) != 0) { + perror("kill"); + return 1; + } + return 0; + } + } + + fprintf(stderr, "kill: %s: %s\n", signame, strerror(errno)); + return 1; +} |