76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
#include <errno.h>
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#include <fcntl.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 LOCKFILE "/tmp/dwmblocks.pid"
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void
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sendsignal(int signum, 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.", stderr);
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exit(2);
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}
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perror("sendsignal - fd");
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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.", stderr);
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exit(2);
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}
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if (sigqueue(fl.l_pid, signum, sv) == -1) {
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if (errno == EINVAL) {
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fputs("Error: invalid signal provided in argument.", stderr);
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exit(3);
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} else if (errno == ESRCH) {
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fputs("Error: no running instance of dwmblocks.", stderr);
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exit(2);
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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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if (argc > 1) {
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int signal;
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union sigval sv;
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if (sscanf(argv[1], "%d", &signal) == 1 &&
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signal > 0 && (signal += SIGRTMIN) <= SIGRTMAX) {
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if (argc == 2) {
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sv.sival_int = 0;
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sendsignal(signal, sv);
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return 0;
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} else if (argc == 3 &&
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sscanf(argv[2], "%d", &(sv.sival_int)) == 1) {
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sendsignal(signal, sv);
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return 0;
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}
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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 3;
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}
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