lib/libc/gen/posix_spawn_fileactions.c

   1 /*-
   2  * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __RCSID("$NetBSD: posix_spawn_fileactions.c,v 1.4 2014/02/02 14:54:39 martin Exp $");
  29
  30 #include "namespace.h"
  31
  32 #include <errno.h>
  33 #include <fcntl.h>
  34 #include <sched.h>
  35 #include <signal.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39 #include <spawn.h>
  40
  41 #define MIN_SIZE        16
  42
  43 /*
  44  * File descriptor actions
  45  */
  46
  47 int
  48 posix_spawn_file_actions_init(posix_spawn_file_actions_t *fa)
  49 {
  50         if (fa == NULL)
  51                 return EINVAL;
  52
  53         fa->fae = malloc(MIN_SIZE * sizeof(struct posix_spawn_file_actions_entry));
  54         if (fa->fae == NULL)
  55                 return ENOMEM;
  56         fa->size = MIN_SIZE;
  57         fa->len = 0;
  58
  59         return 0;
  60 }
  61
  62 int
  63 posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *fa)
  64 {
  65         unsigned int i;
  66
  67         if (fa == NULL)
  68                 return EINVAL;
  69
  70         for (i = 0; i < fa->len; i++) {
  71                 if (fa->fae[i].fae_action == FAE_OPEN)
  72                         free(fa->fae[i].fae_path);
  73         }
  74
  75         free(fa->fae);
  76         return 0;
  77 }
  78
  79 static int
  80 posix_spawn_file_actions_getentry(posix_spawn_file_actions_t *fa,
  81     unsigned int *i)
  82 {
  83         posix_spawn_file_actions_entry_t *fae;
  84
  85         if (fa == NULL)
  86                 return EINVAL;
  87
  88         if (fa->len < fa->size)
  89                 goto out;
  90
  91         fae = realloc(fa->fae, (fa->size + MIN_SIZE) * sizeof(*fa->fae));
  92         if (fae == NULL)
  93                 return ENOMEM;
  94
  95         fa->fae = fae;
  96         fa->size += MIN_SIZE;
  97
  98 out:
  99         *i = fa->len;
 100         return 0;
 101 }
 102
 103 int
 104 posix_spawn_file_actions_addopen(posix_spawn_file_actions_t * __restrict fa,
 105     int fildes, const char * __restrict path, int oflag, mode_t mode)
 106 {
 107         char *faepath;
 108         unsigned int i;
 109         int error;
 110
 111         if (fildes < 0)
 112                 return EBADF;
 113
 114         error = posix_spawn_file_actions_getentry(fa, &i);
 115         if (error)
 116                 return error;
 117
 118         faepath = strdup(path);
 119         if (faepath == NULL)
 120                 return ENOMEM;
 121
 122         fa->fae[i].fae_action = FAE_OPEN;
 123         fa->fae[i].fae_path = faepath;
 124         fa->fae[i].fae_fildes = fildes;
 125         fa->fae[i].fae_oflag = oflag;
 126         fa->fae[i].fae_mode = mode;
 127         fa->len++;
 128
 129         return 0;
 130 }
 131
 132 int
 133 posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *fa,
 134     int fildes, int newfildes)
 135 {
 136         unsigned int i;
 137         int error;
 138
 139         if (fildes < 0 || newfildes < 0)
 140                 return EBADF;
 141
 142         error = posix_spawn_file_actions_getentry(fa, &i);
 143         if (error)
 144                 return error;
 145
 146         fa->fae[i].fae_action = FAE_DUP2;
 147         fa->fae[i].fae_fildes = fildes;
 148         fa->fae[i].fae_newfildes = newfildes;
 149         fa->len++;
 150
 151         return 0;
 152 }
 153
 154 int
 155 posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *fa,
 156     int fildes)
 157 {
 158         unsigned int i;
 159         int error;
 160
 161         if (fildes < 0)
 162                 return EBADF;
 163
 164         error = posix_spawn_file_actions_getentry(fa, &i);
 165         if (error)
 166                 return error;
 167
 168         fa->fae[i].fae_action = FAE_CLOSE;
 169         fa->fae[i].fae_fildes = fildes;
 170         fa->len++;
 171
 172         return 0;
 173 }