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| -rw-r--r-- | toys/kill.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/toys/kill.c b/toys/kill.c new file mode 100644 index 00000000..10c784b2 --- /dev/null +++ b/toys/kill.c @@ -0,0 +1,186 @@ +/* vi: set sw=4 ts=4: + * + * kill.c - a program to send signals to processes + * + * Copyright 2012 Daniel Walter <d.walter@0x90.at> + * + * See http://opengroup.org/onlinepubs/9699919799/utilities/kill.html + +USE_KILL(NEWTOY(kill, NULL, TOYFLAG_BIN)) + +config KILL + bool "kill" + default y + help + usage: kill [-l signal_number | -s signal_name | -signal_name | -signal_number] pid... + + Send a signal to a process + +*/ + +#include "toys.h" + +#define TT this.kill + +typedef struct { + int signum; + char *signame; +} signals_t; + +const signals_t signals[] = { + { 1, "HUP"}, + { 2, "INT"}, + { 3, "QUIT"}, + { 4, "ILL"}, + { 5, "TRAP"}, + { 6, "ABRT"}, + { 7, "BUS"}, + { 8, "FPE"}, + { 9, "KILL"}, + { 10, "USR1"}, + { 11, "SEGV"}, + { 12, "USR2"}, + { 13, "PIPE"}, + { 14, "ALRM"}, + { 15, "TERM"}, + { 16, "STKFLT"}, + { 17, "CHLD"}, + { 18, "CONT"}, + { 19, "STOP"}, + { 20, "TSTP"}, + { 21, "TTIN"}, + { 22, "TTOU"}, + { 23, "URG"}, + { 24, "XCPU"}, + { 25, "XFSZ"}, + { 26, "VTALRM"}, + { 27, "PROF"}, + { 28, "WINCH"}, + { 29, "POLL"}, + { 30, "PWR"}, + { 31, "SYS"}, + /* terminator */ + { -1, NULL}, +}; + +static char* signum_to_signame(int sig) +{ + int i = 0; + for (;;) { + if (signals[i].signum == sig) + return signals[i].signame; + + if (signals[++i].signum == -1) + break; + } + return NULL; +} + +static int signame_to_signum(char *signame) +{ + int i=0; + for (;;) { + if (!strcmp(signals[i].signame, signame)) + return signals[i].signum; + if (signals[++i].signum == -1) + break; + } + return -1; +} + +static int send_signal(int sig, pid_t pid) +{ + if (kill(pid, sig) < 0) { + perror("kill"); + return -1; + } + return 0; +} + +static void list_all_signals() +{ + int i = 0; + for (;;) { + printf("%s ", signals[i++].signame); + if (i % 16 == 0) + printf("\n"); + if (signals[i].signum == -1) + break; + } + printf("\n"); +} + +static int list_signal(int signum) +{ + char *signam = signum_to_signame(signum); + if (signam) { + printf("%s\n", signam); + return 0; + } else { + printf("Unknown signal %d\n", signum); + return -1; + } +} + +static int list_signal_by_name(char *signame) +{ + int signum = signame_to_signum(signame); + if (signum > 0) { + printf("%d\n", signum); + return 0; + } else { + printf("Unknown signal %s\n", signame); + return -1; + } +} + +void kill_main(void) +{ + int signum = 0; + int have_signal = 0; + char *signame, *tmp; + pid_t pid; + while (*toys.optargs) { + char *arg = *(toys.optargs++); + if (arg[0] == '-' && !have_signal) { + arg++; + switch(arg[0]) { + case 'l': + if (!*toys.optargs) + list_all_signals(); + else { + signum = strtol(*(toys.optargs), &signame, 10); + if (signame == *(toys.optargs)) + list_signal_by_name(signame); + else + list_signal(signum); + } + return; + case 's': + arg = *(toys.optargs++); + default: + signum = strtol(arg, &signame, 10); + if (signame == arg) { + signum = signame_to_signum(signame); + if (signum < 0) { + toys.exitval = EXIT_FAILURE; + return; + } + } + have_signal = 1; + } + } else { + /* pids */ + pid = strtol(arg, &tmp, 10); + if (tmp == arg) { + toys.exitval = EXIT_FAILURE; + return; + } + if (send_signal(signum, pid) < 0) { + toys.exitval = EXIT_FAILURE; + return; + } + + } + } +} |