1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/* Auxiliary functions for the creation of subprocesses. OS/2 kLIBC API.
Copyright (C) 2001, 2003-2022 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2003.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "os2-spawn.h"
/* Get _open_osfhandle(). */
#include <io.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "cloexec.h"
#include "error.h"
#include "gettext.h"
#define _(str) gettext (str)
/* Duplicates a file handle, making the copy uninheritable.
Returns -1 for a file handle that is equivalent to closed. */
static int
dup_noinherit (int fd)
{
fd = dup_cloexec (fd);
if (fd < 0 && errno == EMFILE)
error (EXIT_FAILURE, errno, _("_open_osfhandle failed"));
return fd;
}
/* Returns a file descriptor equivalent to FD, except that the resulting file
descriptor is none of STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO.
FD must be open and non-inheritable. The result will be non-inheritable as
well.
If FD < 0, FD itself is returned. */
static int
fd_safer_noinherit (int fd)
{
if (STDIN_FILENO <= fd && fd <= STDERR_FILENO)
{
/* The recursion depth is at most 3. */
int nfd = fd_safer_noinherit (dup_noinherit (fd));
int saved_errno = errno;
close (fd);
errno = saved_errno;
return nfd;
}
return fd;
}
int
dup_safer_noinherit (int fd)
{
return fd_safer_noinherit (dup_noinherit (fd));
}
void
undup_safer_noinherit (int tempfd, int origfd)
{
if (tempfd >= 0)
{
if (dup2 (tempfd, origfd) < 0)
error (EXIT_FAILURE, errno, _("cannot restore fd %d: dup2 failed"),
origfd);
close (tempfd);
}
else
{
/* origfd was closed or open to no handle at all. Set it to a closed
state. This is (nearly) equivalent to the original state. */
close (origfd);
}
}
const char **
prepare_spawn (const char * const *argv, char **mem_to_free)
{
size_t argc;
const char **new_argv;
size_t i;
/* Count number of arguments. */
for (argc = 0; argv[argc] != NULL; argc++)
;
/* Allocate new argument vector. */
new_argv = (const char **) malloc ((1 + argc + 1) * sizeof (const char *));
if (new_argv == NULL)
return NULL;
/* Add an element upfront that can be used when argv[0] turns out to be a
script, not a program.
On Unix, this would be "/bin/sh". */
new_argv[0] = "sh.exe";
/* Put quoted arguments into the new argument vector. */
size_t needed_size = 0;
for (i = 0; i < argc; i++)
{
const char *string = argv[i];
const char *quoted_string = (string[0] == '\0' ? "\"\"" : string);
size_t length = strlen (quoted_string);
needed_size += length + 1;
}
char *mem;
if (needed_size == 0)
mem = NULL;
else
{
mem = (char *) malloc (needed_size);
if (mem == NULL)
{
/* Memory allocation failure. */
free (new_argv);
errno = ENOMEM;
return NULL;
}
}
*mem_to_free = mem;
for (i = 0; i < argc; i++)
{
const char *string = argv[i];
new_argv[1 + i] = mem;
const char *quoted_string = (string[0] == '\0' ? "\"\"" : string);
size_t length = strlen (quoted_string);
memcpy (mem, quoted_string, length + 1);
mem += length + 1;
}
new_argv[1 + argc] = NULL;
return new_argv;
}
|
