Let's add a common implementation for regular file checks, that are
careful to return the right error code (EISDIR/EISLNK/EBADFD) when we
are encountering a wrong file node.
return fd_is_temporary_fs(fd);
}
#endif // 0
+
+int stat_verify_regular(const struct stat *st) {
+ assert(st);
+
+ /* Checks whether the specified stat() structure refers to a regular file. If not returns an appropriate error
+ * code. */
+
+ if (S_ISDIR(st->st_mode))
+ return -EISDIR;
+
+ if (S_ISLNK(st->st_mode))
+ return -ELOOP;
+
+ if (!S_ISREG(st->st_mode))
+ return -EBADFD;
+
+ return 0;
+}
+
+int fd_verify_regular(int fd) {
+ struct stat st;
+
+ assert(fd >= 0);
+
+ if (fstat(fd, &st) < 0)
+ return -errno;
+
+ return stat_verify_regular(&st);
+}
* signed/unsigned comparison, because the magic can be 32 bit unsigned.
*/
#define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
+
+int stat_verify_regular(const struct stat *st);
+int fd_verify_regular(int fd);