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
posix_spawn_file_actions_init(posix_spawn_file_actions_t * fa)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
posix_spawn_file_actions_destroy(posix_spawn_file_actions_t * fa)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
posix_spawn_file_actions_getentry(posix_spawn_file_actions_t * fa,unsigned int * i)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
posix_spawn_file_actions_addopen(posix_spawn_file_actions_t * __restrict fa,int fildes,const char * __restrict path,int oflag,mode_t mode)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
posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t * fa,int fildes,int newfildes)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
posix_spawn_file_actions_addclose(posix_spawn_file_actions_t * fa,int fildes)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 }
174