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 1.2 2012/04/08 11:27:44 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 (-1);
  52
  53         fa->fae = malloc(MIN_SIZE * sizeof(struct posix_spawn_file_actions_entry));
  54         if (fa->fae == NULL)
  55                 return (-1);
  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 (-1);
  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 {
  82         if (fa == NULL)
  83                 return -1;
  84
  85         if (fa->len < fa->size)
  86                 return fa->len;
  87
  88         fa->fae = realloc(fa->fae, (fa->size + MIN_SIZE) *
  89                         sizeof(struct posix_spawn_file_actions_entry));
  90
  91         if (fa->fae == NULL)
  92                 return -1;
  93
  94         fa->size += MIN_SIZE;
  95
  96         return fa->len;
  97 }
  98
  99 int
 100 posix_spawn_file_actions_addopen(posix_spawn_file_actions_t * __restrict fa,
 101     int fildes, const char * __restrict path, int oflag, mode_t mode)
 102 {
 103         int i, error;
 104
 105         if (fildes < 0)
 106                 return (EBADF);
 107
 108         i = posix_spawn_file_actions_getentry(fa);
 109         if (i < 0)
 110                 return (ENOMEM);
 111
 112         fa->fae[i].fae_action = FAE_OPEN;
 113         fa->fae[i].fae_path = strdup(path);
 114         if (fa->fae[i].fae_path == NULL) {
 115                 error = errno;
 116                 return (error);
 117         }
 118         fa->fae[i].fae_fildes = fildes;
 119         fa->fae[i].fae_oflag = oflag;
 120         fa->fae[i].fae_mode = mode;
 121
 122         fa->len++;
 123
 124         return (0);
 125 }
 126
 127 int
 128 posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *fa,
 129     int fildes, int newfildes)
 130 {
 131         int i;
 132
 133         if (fildes < 0 || newfildes < 0)
 134                 return (EBADF);
 135
 136         i = posix_spawn_file_actions_getentry(fa);
 137         if (i < 0)
 138                 return (ENOMEM);
 139
 140         fa->fae[i].fae_action = FAE_DUP2;
 141         fa->fae[i].fae_fildes = fildes;
 142         fa->fae[i].fae_newfildes = newfildes;
 143         fa->len++;
 144
 145         return (0);
 146 }
 147
 148 int
 149 posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *fa,
 150     int fildes)
 151 {
 152         int i;
 153
 154         if (fildes < 0)
 155                 return (EBADF);
 156
 157         i = posix_spawn_file_actions_getentry(fa);
 158         if (i < 0)
 159                 return (ENOMEM);
 160
 161         fa->fae[i].fae_action = FAE_CLOSE;
 162         fa->fae[i].fae_fildes = fildes;
 163         fa->len++;
 164
 165         return (0);
 166 }