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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <signal.h>
static struct {
unsigned int number;
char *name;
} signals[] = {
#define _SIG(name) {SIG##name, #name}
/* Single Unix Specification signals */
_SIG(ABRT),
_SIG(ALRM),
_SIG(FPE),
_SIG(HUP),
_SIG(ILL),
_SIG(INT),
_SIG(KILL),
_SIG(PIPE),
_SIG(QUIT),
_SIG(SEGV),
_SIG(TERM),
_SIG(USR1),
_SIG(USR2),
_SIG(CHLD),
_SIG(CONT),
_SIG(STOP),
_SIG(TSTP),
_SIG(TTIN),
_SIG(TTOU),
_SIG(BUS),
_SIG(POLL),
_SIG(PROF),
_SIG(SYS),
_SIG(TRAP),
_SIG(URG),
_SIG(VTALRM),
_SIG(XCPU),
_SIG(XFSZ),
/* non-SUS signals */
_SIG(IO),
_SIG(PWR),
#ifdef SIGSTKFLT
_SIG(STKFLT),
#endif
_SIG(WINCH),
#undef _SIG
};
/* To indicate a matching signal was not found */
static const unsigned int SENTINEL = (unsigned int) -1;
void list_signals()
{
unsigned int sorted_signals[_NSIG];
unsigned int i;
unsigned int num;
memset(sorted_signals, SENTINEL, sizeof(sorted_signals));
// Sort the signals
for (i = 0; i < sizeof(signals)/sizeof(signals[0]); i++) {
sorted_signals[signals[i].number] = i;
}
num = 0;
for (i = 1; i < _NSIG; i++) {
unsigned int index = sorted_signals[i];
if (index == SENTINEL) {
continue;
}
fprintf(stderr, "%2d) SIG%-9s ", i, signals[index].name);
if ((num++ % 4) == 3) {
fprintf(stderr, "\n");
}
}
if ((num % 4) == 3) {
fprintf(stderr, "\n");
}
}
unsigned int name_to_signal(const char* name)
{
unsigned int i;
for (i = 1; i < sizeof(signals) / sizeof(signals[0]); i++) {
if (!strcasecmp(name, signals[i].name)) {
return signals[i].number;
}
}
return SENTINEL;
}
int kill_main(int argc, char **argv)
{
unsigned int sig = SIGTERM;
int result = 0;
argc--;
argv++;
if (argc >= 1 && argv[0][0] == '-') {
char *endptr;
size_t arg_len = strlen(argv[0]);
if (arg_len < 2) {
fprintf(stderr, "invalid argument: -\n");
return -1;
}
char* arg = argv[0] + 1;
if (arg_len == 2 && *arg == 'l') {
list_signals();
return 0;
}
sig = strtol(arg, &endptr, 10);
if (*endptr != '\0') {
sig = name_to_signal(arg);
if (sig == SENTINEL) {
fprintf(stderr, "invalid signal name: %s\n", arg);
return -1;
}
}
argc--;
argv++;
}
while(argc > 0){
int pid = atoi(argv[0]);
int err = kill(pid, sig);
if (err < 0) {
result = err;
fprintf(stderr, "could not kill pid %d: %s\n", pid, strerror(errno));
}
argc--;
argv++;
}
return result;
}
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