104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <signal.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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#include <unistd.h>
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#define NILL INT_MIN
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#define LOCKFILE "/tmp/dwmblocks.pid"
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int
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parsesignal(char *c, int *s)
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{
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for (*s = 0; *c != '\0'; c++)
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if (*c >= '0' && *c <= '9') {
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*s *= 10;
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*s += *c - '0';
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} else
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return 0;
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if ((*s += SIGRTMIN) > SIGRTMAX)
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return 0;
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return 1;
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}
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int
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parsesigval(char *c, int *v)
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{
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int s = 1;
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if (*c == '-') {
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s = -1;
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c++;
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} else if (*c == '+')
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c++;
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for (*v = 0; *c != '\0'; c++)
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if (*c >= '0' && *c <= '9') {
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*v *= 10;
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*v += *c - '0';
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} else
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return 0;
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*v *= s;
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return 1;
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}
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void
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sendsignal(int sig, union sigval sv)
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{
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int fd;
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struct flock fl;
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fd = open(LOCKFILE, O_RDONLY);
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if (fd == -1) {
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if (errno == ENOENT) {
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fputs("Error: no running instance of dwmblocks.\n", stderr);
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exit(3);
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}
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perror("sendsignal - open");
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exit(1);
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}
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fl.l_type = F_WRLCK;
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fl.l_start = 0;
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fl.l_whence = SEEK_SET;
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fl.l_len = 0;
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if (fcntl(fd, F_GETLK, &fl) == -1) {
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perror("sendsignal - fcntl");
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exit(1);
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}
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if (fl.l_type == F_UNLCK) {
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fputs("Error: no running instance of dwmblocks.\n", stderr);
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exit(3);
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}
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if (sigqueue(fl.l_pid, sig, sv) == -1) {
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if (errno == ESRCH) {
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fputs("Error: no running instance of dwmblocks.\n", stderr);
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exit(3);
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} else {
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perror("sendsignal - sigqueue");
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exit(1);
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}
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}
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}
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int
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main(int argc, char *argv[])
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{
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int sig;
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union sigval sv;
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if (argc > 1 && parsesignal(argv[1], &sig)) {
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if (argc == 2) {
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sv.sival_int = NILL;
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sendsignal(sig, sv);
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return 0;
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} else if (argc == 3 && parsesigval(argv[2], &(sv.sival_int))) {
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sendsignal(sig, sv);
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return 0;
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}
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}
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fprintf(stderr, "Usage: %s <signal> [<sigval>]\n", argv[0]);
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return 2;
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}
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