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
|
/* save-cwd.c -- Save and restore current working directory.
Copyright (C) 1995, 1997, 1998, 2000 Free Software Foundation, Inc.
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 2, 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, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by Jim Meyering <meyering@na-net.ornl.gov>. */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#if HAVE_FCNTL_H
# include <fcntl.h>
#else
# include <sys/file.h>
#endif
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#include "save-cwd.h"
#include "error.h"
char *xgetcwd PARAMS ((void));
/* Record the location of the current working directory in CWD so that
the program may change to other directories and later use restore_cwd
to return to the recorded location. This function may allocate
space using malloc (via xgetcwd) or leave a file descriptor open;
use free_cwd to perform the necessary free or close. Upon failure,
no memory is allocated, any locally opened file descriptors are
closed; return non-zero -- in that case, free_cwd need not be
called, but doing so is ok. Otherwise, return zero. */
int
save_cwd (struct saved_cwd *cwd)
{
static int have_working_fchdir = 1;
cwd->desc = -1;
cwd->name = NULL;
if (have_working_fchdir)
{
#if HAVE_FCHDIR
cwd->desc = open (".", O_RDONLY);
if (cwd->desc < 0)
{
error (0, errno, "cannot open current directory");
return 1;
}
# if __sun__ || sun
/* On SunOS 4, fchdir returns EINVAL if accounting is enabled,
so we have to fall back to chdir. */
if (fchdir (cwd->desc))
{
if (errno == EINVAL)
{
close (cwd->desc);
cwd->desc = -1;
have_working_fchdir = 0;
}
else
{
error (0, errno, "current directory");
close (cwd->desc);
cwd->desc = -1;
return 1;
}
}
# endif /* __sun__ || sun */
#else
# define fchdir(x) (abort (), 0)
have_working_fchdir = 0;
#endif
}
if (!have_working_fchdir)
{
cwd->name = xgetcwd ();
if (cwd->name == NULL)
{
error (0, errno, "cannot get current directory");
return 1;
}
}
return 0;
}
/* Change to recorded location, CWD, in directory hierarchy.
If "saved working directory", NULL))
*/
int
restore_cwd (const struct saved_cwd *cwd, const char *dest, const char *from)
{
int fail = 0;
if (cwd->desc >= 0)
{
if (fchdir (cwd->desc))
{
error (0, errno, "cannot return to %s%s%s",
(dest ? dest : "saved working directory"),
(from ? " from " : ""),
(from ? from : ""));
fail = 1;
}
}
else if (chdir (cwd->name) < 0)
{
error (0, errno, "%s", cwd->name);
fail = 1;
}
return fail;
}
void
free_cwd (struct saved_cwd *cwd)
{
if (cwd->desc >= 0)
close (cwd->desc);
if (cwd->name)
free (cwd->name);
}
|
