-/* macros used by openat-like functions
- Copyright (C) 2005 Free Software Foundation, Inc.
+/* Internals for openat-like functions.
+
+ Copyright (C) 2005, 2006 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
/* written by Jim Meyering */
-#include <stdio.h>
-#include <string.h>
#include <errno.h>
-#include "alloca.h"
-#include "intprops.h"
-
-/* Set PROC_FD_FILENAME to the expansion of "/proc/self/fd/%d/%s" in
- alloca'd memory, using FD and FILE, respectively for %d and %s. */
-#define BUILD_PROC_NAME(Proc_fd_filename, Fd, File) \
- do \
- { \
- size_t filelen = strlen (File); \
- static const char procfd[] = "/proc/self/fd/%d/%s"; \
- /* Buffer for the file name we are going to use. It consists of \
- - the string /proc/self/fd/ \
- - the file descriptor number \
- - the file name provided. \
- The final NUL is included in the sizeof. \
- Subtract 4 to account for %d and %s. */ \
- size_t buflen = sizeof (procfd) - 4 + INT_STRLEN_BOUND (Fd) + filelen; \
- (Proc_fd_filename) = alloca (buflen); \
- snprintf ((Proc_fd_filename), buflen, procfd, (Fd), (File)); \
- } \
- while (0)
+#include <stdlib.h>
+
+#define OPENAT_BUFFER_SIZE 512
+char *openat_proc_name (char buf[OPENAT_BUFFER_SIZE], int fd, char const *file);
/* Some systems don't have ENOSYS. */
#ifndef ENOSYS
# endif
#endif
+/* Some systems don't have EOPNOTSUPP. */
+#ifndef EOPNOTSUPP
+# ifdef ENOTSUP
+# define EOPNOTSUPP ENOTSUP
+# else
+/* Some systems don't have ENOTSUP either. */
+# define EOPNOTSUPP EINVAL
+# endif
+#endif
+
/* Trying to access a BUILD_PROC_NAME file will fail on systems without
/proc support, and even on systems *with* ProcFS support. Return
nonzero if the failure may be legitimate, e.g., because /proc is not