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// vim:ts=4:sw=4:expandtab
#include <stdbool.h>
#include <glob.h>
#include <string.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include "i3status.h"
/*
* Checks if the PID in path is still valid by sending signal 0 (does not do
* anything). kill() will return ESRCH if the process does not exist and 0 or
* EPERM (depending on the uid) if it exists.
*
* If multiple files match the glob pattern, all of them will be checked until
* the first running process is found.
*
*/
bool process_runs(const char *path) {
static char pidbuf[16];
static glob_t globbuf;
memset(pidbuf, 0, sizeof(pidbuf));
if (glob(path, GLOB_NOCHECK | GLOB_TILDE, NULL, &globbuf) != 0)
die("glob() failed\n");
if (globbuf.gl_pathc == 0) {
/* No glob matches, the specified path does not contain a wildcard. */
globfree(&globbuf);
if (!slurp(path, pidbuf, sizeof(pidbuf)))
return false;
return (kill(strtol(pidbuf, NULL, 10), 0) == 0 || errno == EPERM);
}
for (size_t i = 0; i < globbuf.gl_pathc; i++) {
if (!slurp(globbuf.gl_pathv[i], pidbuf, sizeof(pidbuf))) {
globfree(&globbuf);
return false;
}
if (kill(strtol(pidbuf, NULL, 10), 0) == 0 || errno == EPERM) {
globfree(&globbuf);
return true;
}
}
globfree(&globbuf);
return false;
}
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