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