1  /* Implementation of waitid.  Hurd version.
       2     Copyright (C) 1997-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <errno.h>
      20  #include <sys/types.h>
      21  #include <sys/wait.h>
      22  #include <stddef.h>
      23  #include <hurd.h>
      24  #include <hurd/port.h>
      25  #include <hurd/version.h>
      26  #include <sysdep-cancel.h>
      27  
      28  int
      29  __waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
      30  {
      31    struct rusage ignored;
      32    error_t err;
      33    pid_t pid, child;
      34    int sigcode;
      35    int status;
      36    int cancel_oldtype;
      37  
      38    switch (idtype)
      39      {
      40      case P_PID:
      41        if (id <= 0)
      42  	goto invalid;
      43        pid = (pid_t) id;
      44        break;
      45      case P_PGID:
      46        if (id < 0 || id == 1)
      47  	goto invalid;
      48        pid = (pid_t) -id;
      49        break;
      50      case P_ALL:
      51        pid = -1;
      52        break;
      53      default:
      54      invalid:
      55        return __hurd_fail (EINVAL);
      56      }
      57  
      58    /* Technically we're supposed to return EFAULT if infop is bogus,
      59       but that would involve mucking with signals, which is
      60       too much hassle.  User will have to deal with SIGSEGV/SIGBUS.
      61       We just check for a null pointer. */
      62  
      63    if (infop == NULL)
      64      return __hurd_fail (EFAULT);
      65  
      66    cancel_oldtype = LIBC_CANCEL_ASYNC();
      67  #if HURD_INTERFACE_VERSION >= 20201227
      68    err = __USEPORT_CANCEL (PROC, __proc_waitid (port, pid, options,
      69  					       &status, &sigcode,
      70  					       &ignored, &child));
      71    if (err == MIG_BAD_ID || err == EOPNOTSUPP)
      72  #endif
      73      err = __USEPORT_CANCEL (PROC, __proc_wait (port, pid, options,
      74  					       &status, &sigcode,
      75  					       &ignored, &child));
      76    LIBC_CANCEL_RESET (cancel_oldtype);
      77  
      78    if (err == EAGAIN)
      79      {
      80        /* POSIX.1-2008, Technical Corrigendum 1 XSH/TC1-2008/0713 [153] states
      81  	 that if waitid returns because WNOHANG was specified and status is
      82  	 not available for any process specified by idtype and id, then the
      83  	 si_signo and si_pid members of the structure pointed to by infop
      84  	 shall be set to zero.  */
      85        infop->si_signo = 0;
      86        infop->si_code = 0;
      87        return 0;
      88      }
      89  
      90    if (err != 0)
      91      return __hurd_fail (err);
      92  
      93    /* Decode the status field and set infop members... */
      94    infop->si_signo = SIGCHLD;
      95    infop->si_pid = child;
      96    infop->si_errno = 0;
      97  
      98    if (WIFEXITED (status))
      99      {
     100        infop->si_code = CLD_EXITED;
     101        infop->si_status = WEXITSTATUS (status);
     102      }
     103    else if (WIFSIGNALED (status))
     104      {
     105        infop->si_code = WCOREDUMP (status) ? CLD_DUMPED : CLD_KILLED;
     106        infop->si_status = WTERMSIG (status);
     107      }
     108    else if (WIFSTOPPED (status))
     109      {
     110        infop->si_code = CLD_STOPPED;
     111        infop->si_status = WSTOPSIG (status);
     112      }
     113    else if (WIFCONTINUED (status))
     114      {
     115        infop->si_code = CLD_CONTINUED;
     116        infop->si_status = SIGCONT;
     117      }
     118  
     119    return 0;
     120  }
     121  weak_alias (__waitid, waitid)
     122  strong_alias (__waitid, __libc_waitid)