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      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, 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 either `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  */
    183