commands/dumpcore/dumpcore.c

   1 /* dumpcore - create core file of running process */
   2
   3 #include <fcntl.h>
   4 #include <unistd.h>
   5 #include <minix/config.h>
   6 #include <minix/type.h>
   7 #include <minix/ipc.h>
   8 #include <minix/const.h>
   9 #include <sys/ptrace.h>
  10 #include <sys/wait.h>
  11 #include <signal.h>
  12 #include <timers.h>
  13 #include <errno.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <stdlib.h>
  17
  18 #include <machine/archtypes.h>
  19 #include "kernel/proc.h"
  20
  21 #define CLICK_WORDS (CLICK_SIZE / sizeof(unsigned long))
  22
  23 int main(int argc, char *argv[])
  24 {
  25         pid_t pid;
  26         int r, status;
  27
  28         if(argc != 2) {
  29                 printf("usage: %s <pid>\n", argv[0]);
  30                 return 1;
  31         }
  32
  33         pid = atoi(argv[1]);
  34
  35         if (ptrace(T_ATTACH, pid, 0, 0) != 0) {
  36                 perror("ptrace(T_ATTACH)");
  37                 return 1;
  38         }
  39
  40         if (waitpid(pid, &status, 0) != pid) {
  41                 perror("waitpid");
  42                 return 1;
  43         }
  44
  45         while (WIFSTOPPED(status) && WSTOPSIG(status) != SIGSTOP) {
  46                 /* whatever happens here is fine */
  47                 ptrace(T_RESUME, pid, 0, WSTOPSIG(status));
  48
  49                 if (waitpid(pid, &status, 0) != pid) {
  50                         perror("waitpid");
  51                         return 1;
  52                 }
  53         }
  54
  55         if (!WIFSTOPPED(status)) {
  56                 fprintf(stderr, "process died while attaching\n");
  57                 return 1;
  58         }
  59
  60         if (ptrace(T_DUMPCORE, pid, 0, 0) != 0) {
  61                 fprintf(stderr, "warning, dumpcore failed (%s)\n",
  62                         strerror(errno));
  63         }
  64
  65         if (ptrace(T_DETACH, pid, 0, 0)) {
  66                 fprintf(stderr, "warning, detaching failed (%s)\n",
  67                         strerror(errno));
  68         }
  69
  70         return r;
  71 }