77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#define NILL INT_MIN
|
|
#define LOCKFILE "/tmp/dwmblocks.pid"
|
|
|
|
void
|
|
sendsignal(int signum, union sigval sv)
|
|
{
|
|
int fd;
|
|
struct flock fl;
|
|
|
|
fd = open(LOCKFILE, O_RDONLY);
|
|
if (fd == -1) {
|
|
if (errno == ENOENT) {
|
|
fputs("Error: no running instance of dwmblocks.\n", stderr);
|
|
exit(2);
|
|
}
|
|
perror("sendsignal - open");
|
|
exit(1);
|
|
}
|
|
fl.l_type = F_WRLCK;
|
|
fl.l_start = 0;
|
|
fl.l_whence = SEEK_SET;
|
|
fl.l_len = 0;
|
|
if (fcntl(fd, F_GETLK, &fl) == -1) {
|
|
perror("sendsignal - fcntl");
|
|
exit(1);
|
|
}
|
|
if (fl.l_type == F_UNLCK) {
|
|
fputs("Error: no running instance of dwmblocks.\n", stderr);
|
|
exit(2);
|
|
}
|
|
if (sigqueue(fl.l_pid, signum, sv) == -1) {
|
|
if (errno == EINVAL) {
|
|
fputs("Error: invalid signal provided in argument.\n", stderr);
|
|
exit(3);
|
|
} else if (errno == ESRCH) {
|
|
fputs("Error: no running instance of dwmblocks.\n", stderr);
|
|
exit(2);
|
|
} else {
|
|
perror("sendsignal - sigqueue");
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
if (argc > 1) {
|
|
int signal;
|
|
union sigval sv;
|
|
|
|
if (sscanf(argv[1], "%d", &signal) == 1 &&
|
|
signal > 0 && (signal += SIGRTMIN) <= SIGRTMAX) {
|
|
if (argc == 2) {
|
|
sv.sival_int = NILL;
|
|
sendsignal(signal, sv);
|
|
return 0;
|
|
} else if (argc == 3 &&
|
|
sscanf(argv[2], "%d", &(sv.sival_int)) == 1) {
|
|
sendsignal(signal, sv);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
fprintf(stderr, "Usage: %s <signal> [<sigval>]\n", argv[0]);
|
|
return 3;
|
|
}
|