posix/sys/wait.h

   1 /* Copyright (C) 1991-1994,1996-2001,2003,2004,2005,2007
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /*
  21  *      POSIX Standard: 3.2.1 Wait for Process Termination      <sys/wait.h>
  22  */
  23
  24 #ifndef _SYS_WAIT_H
  25 #define _SYS_WAIT_H     1
  26
  27 #include <features.h>
  28
  29 __BEGIN_DECLS
  30
  31 #include <signal.h>
  32 #include <sys/resource.h>
  33
  34 /* These macros could also be defined in <stdlib.h>.  */
  35 #if !defined _STDLIB_H || !defined __USE_XOPEN
  36 /* This will define the `W*' macros for the flag
  37    bits to `waitpid', `wait3', and `wait4'.  */
  38 # include <bits/waitflags.h>
  39
  40 # ifdef __USE_BSD
  41
  42 /* Lots of hair to allow traditional BSD use of `union wait'
  43    as well as POSIX.1 use of `int' for the status word.  */
  44
  45 #  if defined __GNUC__ && !defined __cplusplus
  46 #   define __WAIT_INT(status) \
  47   (__extension__ (((union { __typeof(status) __in; int __i; }) \
  48                    { .__in = (status) }).__i))
  49 #  else
  50 #   define __WAIT_INT(status)   (*(__const int *) &(status))
  51 #  endif
  52
  53 /* This is the type of the argument to `wait'.  The funky union
  54    causes redeclarations with ether `int *' or `union wait *' to be
  55    allowed without complaint.  __WAIT_STATUS_DEFN is the type used in
  56    the actual function definitions.  */
  57
  58 #  if !defined __GNUC__ || __GNUC__ < 2 || defined __cplusplus
  59 #   define __WAIT_STATUS        void *
  60 #   define __WAIT_STATUS_DEFN   void *
  61 #  else
  62 /* This works in GCC 2.6.1 and later.  */
  63 typedef union
  64   {
  65     union wait *__uptr;
  66     int *__iptr;
  67   } __WAIT_STATUS __attribute__ ((__transparent_union__));
  68 #   define __WAIT_STATUS_DEFN   int *
  69 #  endif
  70
  71 # else /* Don't use BSD.  */
  72
  73 #  define __WAIT_INT(status)    (status)
  74 #  define __WAIT_STATUS         int *
  75 #  define __WAIT_STATUS_DEFN    int *
  76
  77 # endif /* Use BSD.  */
  78
  79 /* This will define all the `__W*' macros.  */
  80 # include <bits/waitstatus.h>
  81
  82 # define WEXITSTATUS(status)    __WEXITSTATUS(__WAIT_INT(status))
  83 # define WTERMSIG(status)       __WTERMSIG(__WAIT_INT(status))
  84 # define WSTOPSIG(status)       __WSTOPSIG(__WAIT_INT(status))
  85 # define WIFEXITED(status)      __WIFEXITED(__WAIT_INT(status))
  86 # define WIFSIGNALED(status)    __WIFSIGNALED(__WAIT_INT(status))
  87 # define WIFSTOPPED(status)     __WIFSTOPPED(__WAIT_INT(status))
  88 # ifdef __WIFCONTINUED
  89 #  define WIFCONTINUED(status)  __WIFCONTINUED(__WAIT_INT(status))
  90 # endif
  91 #endif  /* <stdlib.h> not included.  */
  92
  93 #ifdef  __USE_BSD
  94 # define WCOREFLAG              __WCOREFLAG
  95 # define WCOREDUMP(status)      __WCOREDUMP(__WAIT_INT(status))
  96 # define W_EXITCODE(ret, sig)   __W_EXITCODE(ret, sig)
  97 # define W_STOPCODE(sig)        __W_STOPCODE(sig)
  98 #endif
  99
 100 /* The following values are used by the `waitid' function.  */
 101 #if defined __USE_SVID || defined __USE_XOPEN
 102 typedef enum
 103 {
 104   P_ALL,                /* Wait for any child.  */
 105   P_PID,                /* Wait for specified process.  */
 106   P_PGID                /* Wait for members of process group.  */
 107 } idtype_t;
 108 #endif
 109
 110
 111 /* Wait for a child to die.  When one does, put its status in *STAT_LOC
 112    and return its process ID.  For errors, return (pid_t) -1.
 113
 114    This function is a cancellation point and therefore not marked with
 115    __THROW.  */
 116 extern __pid_t wait (__WAIT_STATUS __stat_loc);
 117
 118 #ifdef  __USE_BSD
 119 /* Special values for the PID argument to `waitpid' and `wait4'.  */
 120 # define WAIT_ANY       (-1)    /* Any process.  */
 121 # define WAIT_MYPGRP    0       /* Any process in my process group.  */
 122 #endif
 123
 124 /* Wait for a child matching PID to die.
 125    If PID is greater than 0, match any process whose process ID is PID.
 126    If PID is (pid_t) -1, match any process.
 127    If PID is (pid_t) 0, match any process with the
 128    same process group as the current process.
 129    If PID is less than -1, match any process whose
 130    process group is the absolute value of PID.
 131    If the WNOHANG bit is set in OPTIONS, and that child
 132    is not already dead, return (pid_t) 0.  If successful,
 133    return PID and store the dead child's status in STAT_LOC.
 134    Return (pid_t) -1 for errors.  If the WUNTRACED bit is
 135    set in OPTIONS, return status for stopped children; otherwise don't.
 136
 137    This function is a cancellation point and therefore not marked with
 138    __THROW.  */
 139 extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options);
 140
 141 #if defined __USE_SVID || defined __USE_XOPEN
 142 # define __need_siginfo_t
 143 # include <bits/siginfo.h>
 144 /* Wait for a childing matching IDTYPE and ID to change the status and
 145    place appropriate information in *INFOP.
 146    If IDTYPE is P_PID, match any process whose process ID is ID.
 147    If IDTYPE is P_PGID, match any process whose process group is ID.
 148    If IDTYPE is P_ALL, match any process.
 149    If the WNOHANG bit is set in OPTIONS, and that child
 150    is not already dead, clear *INFOP and return 0.  If successful, store
 151    exit code and status in *INFOP.
 152
 153    This function is a cancellation point and therefore not marked with
 154    __THROW.  */
 155 extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop,
 156                    int __options);
 157 #endif
 158
 159 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 160 /* This being here makes the prototypes valid whether or not
 161    we have already included <sys/resource.h> to define `struct rusage'.  */
 162 struct rusage;
 163
 164 /* Wait for a child to exit.  When one does, put its status in *STAT_LOC and
 165    return its process ID.  For errors return (pid_t) -1.  If USAGE is not
 166    nil, store information about the child's resource usage there.  If the
 167    WUNTRACED bit is set in OPTIONS, return status for stopped children;
 168    otherwise don't.  */
 169 extern __pid_t wait3 (__WAIT_STATUS __stat_loc, int __options,
 170                       struct rusage * __usage) __THROW;
 171 #endif
 172
 173 #ifdef __USE_BSD
 174 /* PID is like waitpid.  Other args are like wait3.  */
 175 extern __pid_t wait4 (__pid_t __pid, __WAIT_STATUS __stat_loc, int __options,
 176                       struct rusage *__usage) __THROW;
 177 #endif /* Use BSD.  */
 178
 179
 180 __END_DECLS
 181
 182 #endif /* sys/wait.h  */