include/sys/wait.h

   1 /* Copyright (C) 1991-1994,1996-2001,2003,2004,2005,2007,2009
   2    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    <http://www.gnu.org/licenses/>.  */
  18
  19 /*
  20  *      POSIX Standard: 3.2.1 Wait for Process Termination      <sys/wait.h>
  21  */
  22
  23 #ifndef _SYS_WAIT_H
  24 #define _SYS_WAIT_H     1
  25
  26 #include <features.h>
  27
  28 __BEGIN_DECLS
  29
  30 #include <signal.h>
  31
  32 /* These macros could also be defined in <stdlib.h>.  */
  33 #if !defined _STDLIB_H || (!defined __USE_XOPEN && !defined __USE_XOPEN2K8)
  34 /* This will define the `W*' macros for the flag
  35    bits to `waitpid', `wait3', and `wait4'.  */
  36 # include <bits/waitflags.h>
  37
  38 # ifdef __USE_BSD
  39
  40 /* Lots of hair to allow traditional BSD use of `union wait'
  41    as well as POSIX.1 use of `int' for the status word.  */
  42
  43 #  if defined __GNUC__ && !defined __cplusplus
  44 #   define __WAIT_INT(status) \
  45   (__extension__ (((union { __typeof(status) __in; int __i; }) \
  46                    { .__in = (status) }).__i))
  47 #  else
  48 #   define __WAIT_INT(status)   (*(const int *) &(status))
  49 #  endif
  50
  51 /* This is the type of the argument to `wait'.  The funky union
  52    causes redeclarations with either `int *' or `union wait *' to be
  53    allowed without complaint.  __WAIT_STATUS_DEFN is the type used in
  54    the actual function definitions.  */
  55
  56 #  if !defined __GNUC__ || __GNUC__ < 2 || defined __cplusplus
  57 #   define __WAIT_STATUS        void *
  58 #   define __WAIT_STATUS_DEFN   void *
  59 #  else
  60 /* This works in GCC 2.6.1 and later.  */
  61 typedef union
  62   {
  63     union wait *__uptr;
  64     int *__iptr;
  65   } __WAIT_STATUS __attribute__ ((__transparent_union__));
  66 #   define __WAIT_STATUS_DEFN   int *
  67 #  endif
  68
  69 # else /* Don't use BSD.  */
  70
  71 #  define __WAIT_INT(status)    (status)
  72 #  define __WAIT_STATUS         int *
  73 #  define __WAIT_STATUS_DEFN    int *
  74
  75 # endif /* Use BSD.  */
  76
  77 /* This will define all the `__W*' macros.  */
  78 # include <bits/waitstatus.h>
  79
  80 # define WEXITSTATUS(status)    __WEXITSTATUS (__WAIT_INT (status))
  81 # define WTERMSIG(status)       __WTERMSIG (__WAIT_INT (status))
  82 # define WSTOPSIG(status)       __WSTOPSIG (__WAIT_INT (status))
  83 # define WIFEXITED(status)      __WIFEXITED (__WAIT_INT (status))
  84 # define WIFSIGNALED(status)    __WIFSIGNALED (__WAIT_INT (status))
  85 # define WIFSTOPPED(status)     __WIFSTOPPED (__WAIT_INT (status))
  86 # ifdef __WIFCONTINUED
  87 #  define WIFCONTINUED(status)  __WIFCONTINUED (__WAIT_INT (status))
  88 # endif
  89 #endif  /* <stdlib.h> not included.  */
  90
  91 #ifdef  __USE_BSD
  92 # define WCOREFLAG              __WCOREFLAG
  93 # define WCOREDUMP(status)      __WCOREDUMP (__WAIT_INT (status))
  94 # define W_EXITCODE(ret, sig)   __W_EXITCODE (ret, sig)
  95 # define W_STOPCODE(sig)        __W_STOPCODE (sig)
  96 #endif
  97
  98 /* The following values are used by the `waitid' function.  */
  99 #if defined __USE_SVID || defined __USE_XOPEN || defined __USE_XOPEN2K8
 100 typedef enum
 101 {
 102   P_ALL,                /* Wait for any child.  */
 103   P_PID,                /* Wait for specified process.  */
 104   P_PGID                /* Wait for members of process group.  */
 105 } idtype_t;
 106 #endif
 107
 108
 109 /* Wait for a child to die.  When one does, put its status in *STAT_LOC
 110    and return its process ID.  For errors, return (pid_t) -1.
 111
 112    This function is a cancellation point and therefore not marked with
 113    __THROW.  */
 114 extern __pid_t wait (__WAIT_STATUS __stat_loc);
 115
 116 #ifdef  __USE_BSD
 117 /* Special values for the PID argument to `waitpid' and `wait4'.  */
 118 # define WAIT_ANY       (-1)    /* Any process.  */
 119 # define WAIT_MYPGRP    0       /* Any process in my process group.  */
 120 #endif
 121
 122 /* Wait for a child matching PID to die.
 123    If PID is greater than 0, match any process whose process ID is PID.
 124    If PID is (pid_t) -1, match any process.
 125    If PID is (pid_t) 0, match any process with the
 126    same process group as the current process.
 127    If PID is less than -1, match any process whose
 128    process group is the absolute value of PID.
 129    If the WNOHANG bit is set in OPTIONS, and that child
 130    is not already dead, return (pid_t) 0.  If successful,
 131    return PID and store the dead child's status in STAT_LOC.
 132    Return (pid_t) -1 for errors.  If the WUNTRACED bit is
 133    set in OPTIONS, return status for stopped children; otherwise don't.
 134
 135    This function is a cancellation point and therefore not marked with
 136    __THROW.  */
 137 extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options);
 138 #ifdef _LIBC
 139 extern __typeof(waitpid) __waitpid_nocancel attribute_hidden;
 140 libc_hidden_proto(waitpid)
 141 #endif
 142
 143 #if defined __USE_SVID || defined __USE_XOPEN || defined __USE_XOPEN2K8
 144 # ifndef __id_t_defined
 145 #  include <bits/types.h>
 146         typedef __id_t id_t;
 147 #  define __id_t_defined
 148 # endif
 149 # define __need_siginfo_t
 150 # include <bits/siginfo.h>
 151
 152 /* Wait for a childing matching IDTYPE and ID to change the status and
 153    place appropriate information in *INFOP.
 154    If IDTYPE is P_PID, match any process whose process ID is ID.
 155    If IDTYPE is P_PGID, match any process whose process group is ID.
 156    If IDTYPE is P_ALL, match any process.
 157    If the WNOHANG bit is set in OPTIONS, and that child
 158    is not already dead, clear *INFOP and return 0.  If successful, store
 159    exit code and status in *INFOP.
 160
 161    This function is a cancellation point and therefore not marked with
 162    __THROW.  */
 163 extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop,
 164                    int __options);
 165 #endif
 166
 167 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 168 struct rusage;
 169 /* Wait for a child to exit.  When one does, put its status in *STAT_LOC and
 170    return its process ID.  For errors return (pid_t) -1.  If USAGE is not
 171    nil, store information about the child's resource usage there.  If the
 172    WUNTRACED bit is set in OPTIONS, return status for stopped children;
 173    otherwise don't.  */
 174 extern __pid_t wait3 (__WAIT_STATUS __stat_loc, int __options,
 175                       struct rusage * __usage) __THROWNL;
 176 #endif
 177
 178 #ifdef __USE_BSD
 179 /* PID is like waitpid.  Other args are like wait3.  */
 180 extern __pid_t wait4 (__pid_t __pid, __WAIT_STATUS __stat_loc, int __options,
 181                       struct rusage *__usage) __THROWNL;
 182 #endif /* Use BSD.  */
 183
 184 #ifdef _LIBC
 185 extern __pid_t __wait4_nocancel(__pid_t, __WAIT_STATUS, int, struct rusage *) attribute_hidden;
 186 #endif
 187
 188
 189 __END_DECLS
 190
 191 #endif /* sys/wait.h  */