posix/spawn.h

   1 /* Definitions for POSIX spawn interface.
   2    Copyright (C) 2000, 2003 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 #ifndef _SPAWN_H
  21 #define _SPAWN_H        1
  22
  23 #include <features.h>
  24 #include <sched.h>
  25 #include <signal.h>
  26 #include <sys/types.h>
  27
  28
  29 /* Data structure to contain attributes for thread creation.  */
  30 typedef struct
  31 {
  32   short int __flags;
  33   pid_t __pgrp;
  34   sigset_t __sd;
  35   sigset_t __ss;
  36   struct sched_param __sp;
  37   int __policy;
  38   int __pad[16];
  39 } posix_spawnattr_t;
  40
  41
  42 /* Data structure to contain information about the actions to be
  43    performed in the new process with respect to file descriptors.  */
  44 typedef struct
  45 {
  46   int __allocated;
  47   int __used;
  48   struct __spawn_action *__actions;
  49   int __pad[16];
  50 } posix_spawn_file_actions_t;
  51
  52
  53 /* Flags to be set in the `posix_spawnattr_t'.  */
  54 #define POSIX_SPAWN_RESETIDS            0x01
  55 #define POSIX_SPAWN_SETPGROUP           0x02
  56 #define POSIX_SPAWN_SETSIGDEF           0x04
  57 #define POSIX_SPAWN_SETSIGMASK          0x08
  58 #define POSIX_SPAWN_SETSCHEDPARAM       0x10
  59 #define POSIX_SPAWN_SETSCHEDULER        0x20
  60
  61
  62 __BEGIN_DECLS
  63
  64 /* Spawn a new process executing PATH with the attributes describes in *ATTRP.
  65    Before running the process perform the actions described in FILE-ACTIONS.
  66
  67    This function is a possible cancellation points and therefore not
  68    marked with __THROW. */
  69 extern int posix_spawn (pid_t *__restrict __pid,
  70                         __const char *__restrict __path,
  71                         __const posix_spawn_file_actions_t *__restrict
  72                         __file_actions,
  73                         __const posix_spawnattr_t *__restrict __attrp,
  74                         char *__const argv[__restrict_arr],
  75                         char *__const envp[__restrict_arr]);
  76
  77 /* Similar to `posix_spawn' but search for FILE in the PATH.
  78
  79    This function is a possible cancellation points and therefore not
  80    marked with __THROW.  */
  81 extern int posix_spawnp (pid_t *__pid, __const char *__file,
  82                          __const posix_spawn_file_actions_t *__file_actions,
  83                          __const posix_spawnattr_t *__attrp,
  84                          char *__const argv[], char *__const envp[]);
  85
  86
  87 /* Initialize data structure with attributes for `spawn' to default values.  */
  88 extern int posix_spawnattr_init (posix_spawnattr_t *__attr) __THROW;
  89
  90 /* Free resources associated with ATTR.  */
  91 extern int posix_spawnattr_destroy (posix_spawnattr_t *__attr) __THROW;
  92
  93 /* Store signal mask for signals with default handling from ATTR in
  94    SIGDEFAULT.  */
  95 extern int posix_spawnattr_getsigdefault (__const posix_spawnattr_t *
  96                                           __restrict __attr,
  97                                           sigset_t *__restrict __sigdefault)
  98      __THROW;
  99
 100 /* Set signal mask for signals with default handling in ATTR to SIGDEFAULT.  */
 101 extern int posix_spawnattr_setsigdefault (posix_spawnattr_t *__restrict __attr,
 102                                           __const sigset_t *__restrict
 103                                           __sigdefault)
 104      __THROW;
 105
 106 /* Store signal mask for the new process from ATTR in SIGMASK.  */
 107 extern int posix_spawnattr_getsigmask (__const posix_spawnattr_t *__restrict
 108                                        __attr,
 109                                        sigset_t *__restrict __sigmask) __THROW;
 110
 111 /* Set signal mask for the new process in ATTR to SIGMASK.  */
 112 extern int posix_spawnattr_setsigmask (posix_spawnattr_t *__restrict __attr,
 113                                        __const sigset_t *__restrict __sigmask)
 114      __THROW;
 115
 116 /* Get flag word from the attribute structure.  */
 117 extern int posix_spawnattr_getflags (__const posix_spawnattr_t *__restrict
 118                                      __attr,
 119                                      short int *__restrict __flags) __THROW;
 120
 121 /* Store flags in the attribute structure.  */
 122 extern int posix_spawnattr_setflags (posix_spawnattr_t *_attr,
 123                                      short int __flags) __THROW;
 124
 125 /* Get process group ID from the attribute structure.  */
 126 extern int posix_spawnattr_getpgroup (__const posix_spawnattr_t *__restrict
 127                                       __attr, pid_t *__restrict __pgroup)
 128      __THROW;
 129
 130 /* Store process group ID in the attribute structure.  */
 131 extern int posix_spawnattr_setpgroup (posix_spawnattr_t *__attr,
 132                                       pid_t __pgroup) __THROW;
 133
 134 /* Get scheduling policy from the attribute structure.  */
 135 extern int posix_spawnattr_getschedpolicy (__const posix_spawnattr_t *
 136                                            __restrict __attr,
 137                                            int *__restrict __schedpolicy)
 138      __THROW;
 139
 140 /* Store scheduling policy in the attribute structure.  */
 141 extern int posix_spawnattr_setschedpolicy (posix_spawnattr_t *__attr,
 142                                            int __schedpolicy) __THROW;
 143
 144 /* Get scheduling parameters from the attribute structure.  */
 145 extern int posix_spawnattr_getschedparam (__const posix_spawnattr_t *
 146                                           __restrict __attr,
 147                                           struct sched_param *__restrict
 148                                           __schedparam) __THROW;
 149
 150 /* Store scheduling parameters in the attribute structure.  */
 151 extern int posix_spawnattr_setschedparam (posix_spawnattr_t *__restrict __attr,
 152                                           const struct sched_param *
 153                                           __restrict __schedparam) __THROW;
 154
 155
 156 /* Initialize data structure for file attribute for `spawn' call.  */
 157 extern int posix_spawn_file_actions_init (posix_spawn_file_actions_t *
 158                                           __file_actions) __THROW;
 159
 160 /* Free resources associated with FILE-ACTIONS.  */
 161 extern int posix_spawn_file_actions_destroy (posix_spawn_file_actions_t *
 162                                              __file_actions) __THROW;
 163
 164 /* Add an action to FILE-ACTIONS which tells the implementation to call
 165    `open' for the given file during the `spawn' call.  */
 166 extern int posix_spawn_file_actions_addopen (posix_spawn_file_actions_t *
 167                                              __restrict __file_actions,
 168                                              int __fd,
 169                                              __const char *__restrict __path,
 170                                              int __oflag, mode_t __mode)
 171      __THROW;
 172
 173 /* Add an action to FILE-ACTIONS which tells the implementation to call
 174    `close' for the given file descriptor during the `spawn' call.  */
 175 extern int posix_spawn_file_actions_addclose (posix_spawn_file_actions_t *
 176                                               __file_actions, int __fd)
 177      __THROW;
 178
 179 /* Add an action to FILE-ACTIONS which tells the implementation to call
 180    `dup2' for the given file descriptors during the `spawn' call.  */
 181 extern int posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *
 182                                              __file_actions,
 183                                              int __fd, int __newfd) __THROW;
 184
 185 __END_DECLS
 186
 187 #endif /* spawn.h */