PSI sics-cvs-psi_pre-ansto

tecs/keep_running.c

@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/wait.h>
+
+#define MAX_CNT 10
+#define MIN_PERIOD 3600
+
+int main(int argc, char *argv[]) {
+  int cnt, dif;
+  time_t tim1, tim2;
+  pid_t pid;
+  int status, i;
+  
+  if (argc<2) return 0;
+  cnt = MAX_CNT;
+  while (cnt > 0) {
+    time(&tim1);
+    pid=vfork();
+    if (pid == 0) {
+      execvp(argv[1], argv+1);
+      perror("execvp");
+      exit(1);
+    }
+    waitpid(pid, &status, 0);
+    if (status==512) { /* kill */
+      return 0;
+    }
+    if (status==256) { /* restart */
+      cnt = MAX_CNT;
+    }
+    time(&tim2);
+    dif = (int) difftime(tim2, tim1);
+    cnt += dif / MIN_PERIOD;
+    if (cnt > MAX_CNT) cnt = MAX_CNT;
+    cnt--;
+    if (dif < MIN_PERIOD) {
+      printf("Status=%d. Died after %d sec", status, dif);
+    } else {
+      printf("Status=%d. Died after %f hours", status, dif/3600.);
+    }
+    if (cnt > 0) {
+      printf(" - %d tries left - retry ...\n", cnt);
+    }
+  }
+  printf(" - too many restarts\n");
+  return -1;
+}