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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
/*
* Copyright (C) 2012 Sami Kerola <kerolasa@iki.fi>
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "c.h"
#include "fileutils.h"
#include "pathnames.h"
int mkstemp_cloexec(char *template)
{
#ifdef HAVE_MKOSTEMP
return mkostemp(template, O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC);
#else
int fd, old_flags, errno_save;
fd = mkstemp(template);
if (fd < 0)
return fd;
old_flags = fcntl(fd, F_GETFD, 0);
if (old_flags < 0)
goto unwind;
if (fcntl(fd, F_SETFD, old_flags | O_CLOEXEC) < 0)
goto unwind;
return fd;
unwind:
errno_save = errno;
unlink(template);
close(fd);
errno = errno_save;
return -1;
#endif
}
/* Create open temporary file in safe way. Please notice that the
* file permissions are -rw------- by default. */
int xmkstemp(char **tmpname, const char *dir, const char *prefix)
{
char *localtmp;
const char *tmpenv;
mode_t old_mode;
int fd, rc;
/* Some use cases must be capable of being moved atomically
* with rename(2), which is the reason why dir is here. */
tmpenv = dir ? dir : getenv("TMPDIR");
if (!tmpenv)
tmpenv = _PATH_TMP;
rc = asprintf(&localtmp, "%s/%s.XXXXXX", tmpenv, prefix);
if (rc < 0)
return -1;
old_mode = umask(077);
fd = mkstemp_cloexec(localtmp);
umask(old_mode);
if (fd == -1) {
free(localtmp);
localtmp = NULL;
}
*tmpname = localtmp;
return fd;
}
int dup_fd_cloexec(int oldfd, int lowfd)
{
int fd, flags, errno_save;
#ifdef F_DUPFD_CLOEXEC
fd = fcntl(oldfd, F_DUPFD_CLOEXEC, lowfd);
if (fd >= 0)
return fd;
#endif
fd = dup(oldfd);
if (fd < 0)
return fd;
flags = fcntl(fd, F_GETFD);
if (flags < 0)
goto unwind;
if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0)
goto unwind;
return fd;
unwind:
errno_save = errno;
close(fd);
errno = errno_save;
return -1;
}
/*
* portable getdtablesize()
*/
int get_fd_tabsize(void)
{
int m;
#if defined(HAVE_GETDTABLESIZE)
m = getdtablesize();
#elif defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
struct rlimit rl;
getrlimit(RLIMIT_NOFILE, &rl);
m = rl.rlim_cur;
#elif defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
m = sysconf(_SC_OPEN_MAX);
#else
m = OPEN_MAX;
#endif
return m;
}
#ifdef TEST_PROGRAM_FILEUTILS
int main(void)
{
FILE *f;
char *tmpname;
f = xfmkstemp(&tmpname, NULL, "test");
unlink(tmpname);
free(tmpname);
fclose(f);
return EXIT_FAILURE;
}
#endif
int mkdir_p(const char *path, mode_t mode)
{
char *p, *dir;
int rc = 0;
if (!path || !*path)
return -EINVAL;
dir = p = strdup(path);
if (!dir)
return -ENOMEM;
if (*p == '/')
p++;
while (p && *p) {
char *e = strchr(p, '/');
if (e)
*e = '\0';
if (*p) {
rc = mkdir(dir, mode);
if (rc && errno != EEXIST)
break;
rc = 0;
}
if (!e)
break;
*e = '/';
p = e + 1;
}
free(dir);
return rc;
}
/* returns basename and keeps dirname in the @path, if @path is "/" (root)
* then returns empty string */
char *stripoff_last_component(char *path)
{
char *p = path ? strrchr(path, '/') : NULL;
if (!p)
return NULL;
*p = '\0';
return p + 1;
}
|
