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authorbigbiff bigbiff <bigbiff@teamw.in>2013-02-23 02:55:50 +0100
committerbigbiff bigbiff <bigbiff@teamw.in>2013-02-25 15:06:46 +0100
commite60683a0d553b6488c564863f4e48954944fb0f8 (patch)
tree9364f97cb88b7c1359f5f06dfb32150a78168c31 /libblkid/at.c
parentFix building of updater for 4.2 environment (diff)
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Diffstat (limited to 'libblkid/at.c')
-rw-r--r--libblkid/at.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/libblkid/at.c b/libblkid/at.c
new file mode 100644
index 000000000..f8bfe1399
--- /dev/null
+++ b/libblkid/at.c
@@ -0,0 +1,143 @@
+/*
+ * Portable xxxat() functions.
+ *
+ * No copyright is claimed. This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#include "at.h"
+#include "c.h"
+
+#ifdef HAVE_FSTATAT
+int fstat_at(int dir, const char *dirname __attribute__ ((__unused__)),
+ const char *filename, struct stat *st, int nofollow)
+{
+ return fstatat(dir, filename, st,
+ nofollow ? AT_SYMLINK_NOFOLLOW : 0);
+}
+#else
+int fstat_at(int dir, const char *dirname, const char *filename,
+ struct stat *st, int nofollow)
+{
+
+ if (*filename != '/') {
+ 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);
+ }
+
+ return nofollow ? lstat(filename, st) : stat(filename, st);
+}
+#endif
+
+#ifdef HAVE_FSTATAT
+int open_at(int dir, const char *dirname __attribute__ ((__unused__)),
+ const char *filename, int flags)
+{
+ return openat(dir, filename, flags);
+}
+#else
+int open_at(int dir, const char *dirname, const char *filename, int flags)
+{
+ if (*filename != '/') {
+ 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);
+ }
+ return open(filename, 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 HAVE_FSTATAT
+ssize_t readlink_at(int dir, const char *dirname __attribute__ ((__unused__)),
+ const char *pathname, char *buf, size_t bufsiz)
+{
+ return readlinkat(dir, pathname, buf, bufsiz);
+}
+#else
+ssize_t readlink_at(int dir, const char *dirname, const char *pathname,
+ char *buf, size_t bufsiz)
+{
+ if (*pathname != '/') {
+ char path[PATH_MAX];
+ int len;
+
+ len = snprintf(path, sizeof(path), "%s/%s", dirname, pathname);
+ if (len < 0 || len + 1 > sizeof(path))
+ return -1;
+
+ return readlink(path, buf, bufsiz);
+ }
+ return readlink(pathname, buf, bufsiz);
+}
+#endif
+
+#ifdef TEST_PROGRAM_AT
+#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, "cannot open %s", 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