1 files changed, 55 insertions, 0 deletions
diff --git a/src/process_runs.c b/src/process_runs.c
new file mode 100644
index 0000000..5e13de7
--- /dev/null
+++ b/src/process_runs.c
@@ -0,0 +1,55 @@
+#include <stdbool.h>
+#include <glob.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef LINUX
+/* TODO: correctly check for *BSD */
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/resource.h>
+#endif
+
+#include "i3status.h"
+
+/*
+ * Checks if the PID in path is still valid by checking:
+ *  (Linux) if /proc/<pid> exists
+ *  (NetBSD) if sysctl returns process infos for this pid
+ *
+ */
+bool process_runs(const char *path) {
+        char pidbuf[16];
+        static glob_t globbuf;
+        int fd;
+        memset(pidbuf, 0, sizeof(pidbuf));
+
+        if (glob(path, GLOB_NOCHECK | GLOB_TILDE, NULL, &globbuf) < 0)
+                die("glob() failed\n");
+        fd = open((globbuf.gl_pathc > 0 ? globbuf.gl_pathv[0] : path), O_RDONLY);
+        globfree(&globbuf);
+        if (fd < 0)
+                return false;
+        (void)read(fd, pidbuf, sizeof(pidbuf));
+        (void)close(fd);
+
+#ifdef LINUX
+        struct stat statbuf;
+        char procbuf[512];
+        (void)snprintf(procbuf, sizeof(procbuf), "/proc/%ld", strtol(pidbuf, NULL, 10));
+        return (stat(procbuf, &statbuf) >= 0);
+#else
+        /* TODO: correctly check for NetBSD. Evaluate if this runs on OpenBSD/FreeBSD */
+        struct kinfo_proc info;
+        size_t length = sizeof(struct kinfo_proc);
+        int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, strtol(pidbuf, NULL, 10) };
+        if (sysctl(mib, 4, &info, &length, NULL, 0) < 0)
+                return false;
+        return (length != 0);
+#endif
+}