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
|
/*
* Portable xxxat() functions.
*
* Copyright (C) 2010 Karel Zak <kzak@redhat.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "at.h"
int fstat_at(int dir, const char *dirname, const char *filename,
struct stat *st, int nofollow)
{
#ifdef HAVE_FSTATAT
return fstatat(dir, filename, st,
nofollow ? AT_SYMLINK_NOFOLLOW : 0);
#else
char path[PATH_MAX];
int len;
len = snprintf(path, sizeof(path), "%s/%s", dirname, filename);
if (len < 0 || len + 1 > sizeof(path))
return -1;
return nofollow ? lstat(path, st) : stat(path, st);
#endif
}
int open_at(int dir, const char *dirname, const char *filename, int flags)
{
#ifdef HAVE_FSTATAT
return openat(dir, filename, flags);
#else
char path[PATH_MAX];
int len;
len = snprintf(path, sizeof(path), "%s/%s", dirname, filename);
if (len < 0 || len + 1 > sizeof(path))
return -1;
return open(path, flags);
#endif
}
FILE *fopen_at(int dir, const char *dirname, const char *filename, int flags,
const char *mode)
{
int fd = open_at(dir, dirname, filename, flags);
if (fd < 0)
return NULL;
return fdopen(fd, mode);
}
#ifdef TEST_PROGRAM
#include <err.h>
#include <errno.h>
#include <sys/types.h>
#include <dirent.h>
#include <string.h>
int main(int argc, char *argv[])
{
DIR *dir;
struct dirent *d;
char *dirname;
if (argc != 2) {
fprintf(stderr, "usage: %s <directory>\n", argv[0]);
exit(EXIT_FAILURE);
}
dirname = argv[1];
dir = opendir(dirname);
if (!dir)
err(EXIT_FAILURE, "%s: open failed", dirname);
while ((d = readdir(dir))) {
struct stat st;
FILE *f;
printf("%32s ", d->d_name);
if (fstat_at(dirfd(dir), dirname, d->d_name, &st, 0) == 0)
printf("%16jd bytes ", st.st_size);
else
printf("%16s bytes ", "???");
f = fopen_at(dirfd(dir), dirname, d->d_name, O_RDONLY, "r");
printf(" %s\n", f ? "OK" : strerror(errno));
if (f)
fclose(f);
}
closedir(dir);
return EXIT_SUCCESS;
}
#endif
|
