My dwm config.
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static int statussig;
pid_t statuspid = -1;
pid_t
getstatusbarpid()
{
char buf[32], *str = buf, *c;
FILE *fp;
if (statuspid > 0) {
snprintf(buf, sizeof(buf), "/proc/%u/cmdline", statuspid);
if ((fp = fopen(buf, "r"))) {
fgets(buf, sizeof(buf), fp);
while ((c = strchr(str, '/')))
str = c + 1;
fclose(fp);
if (!strcmp(str, STATUSBAR))
return statuspid;
}
}
if (!(fp = popen("pgrep -o "STATUSBAR, "r")))
return -1;
fgets(buf, sizeof(buf), fp);
pclose(fp);
return strtol(buf, NULL, 10);
}
void
sigstatusbar(const Arg *arg)
{
union sigval sv;
if (!statussig)
return;
if ((statuspid = getstatusbarpid()) <= 0)
return;
#if BAR_DWMBLOCKS_SIGUSR1_PATCH
sv.sival_int = (statussig << 8) | arg->i;
if (sigqueue(statuspid, SIGUSR1, sv) == -1) {
if (errno == ESRCH) {
if (!getstatusbarpid())
sigqueue(statuspid, SIGUSR1, sv);
}
}
#else
sv.sival_int = arg->i;
sigqueue(statuspid, SIGRTMIN+statussig, sv);
#endif // BAR_DWMBLOCKS_SIGUSR1_PATCH
}