src/internal/emulate_wait4.c

   1 #include <sys/wait.h>
   2 #include "syscall.h"
   3
   4 #ifndef SYS_wait4
   5 hidden long __emulate_wait4(int pid, int *status, int options, void *kru, int cp)
   6 {
   7         idtype_t t;
   8         int r;
   9         siginfo_t info;
  10
  11         info.si_pid = 0;
  12         if (pid < -1) {
  13                 t = P_PGID;
  14                 pid = -pid;
  15         } else if (pid == -1) {
  16                 t = P_ALL;
  17         } else if (pid == 0) {
  18                 t = P_PGID;
  19         } else {
  20                 t = P_PID;
  21         }
  22
  23         if (cp) r = __syscall_cp(SYS_waitid, t, pid, &info, options|WEXITED, kru);
  24         else r = __syscall(SYS_waitid, t, pid, &info, options|WEXITED, kru);
  25
  26         if (r<0) return r;
  27
  28         if (info.si_pid && status) {
  29                 int sw=0;
  30                 switch (info.si_code) {
  31                 case CLD_CONTINUED:
  32                         sw = 0xffff;
  33                         break;
  34                 case CLD_DUMPED:
  35                         sw = info.si_status&0x7f | 0x80;
  36                         break;
  37                 case CLD_EXITED:
  38                         sw = (info.si_status&0xff) << 8;
  39                         break;
  40                 case CLD_KILLED:
  41                         sw = info.si_status&0x7f;
  42                         break;
  43                 case CLD_STOPPED:
  44                 case CLD_TRAPPED:
  45                         /* see ptrace(2); the high bits of si_status can contain */
  46                         /* PTRACE_EVENT_ values which must be preserved */
  47                         sw = (info.si_status << 8) + 0x7f;
  48                         break;
  49                 }
  50                 *status = sw;
  51         }
  52
  53         return info.si_pid;
  54 }
  55 #endif