Bug#610824: libc6-dev: POSIX/SUS defines and functions require GNU specific defines
Package: libc6-dev
Version: 2.11.2-9
Severity: important
Tags: upstream
Several standardized defines and functions which are part of POSIX.1-2008/SUSv4 require nonstandard GNU defines in order to function properly.
I don't know the full range of standardized functions and defines which are affected, but I have found several.
http://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html
Specifies that O_DIRECTORY, O_NOFOLLOW, and O_CLOEXEC are part of the standard for open()/openat().
The manpages incorrectly states regarding some, that they are Linux-specific, when they aren't.
O_DIRECTORY
If pathname is not a directory, cause the open to fail. This flag is Linux-specific, and was added in kernel version 2.1.126, to avoid
denial-of-service problems if opendir(3) is called on a FIFO or tape device, but should not be used outside of the implementation of
opendir(3).
<fcntl.h> ends up wrapping them as follows:
#ifdef __USE_GNU
# define O_DIRECT 040000 /* Direct disk access. */
# define O_DIRECTORY 0200000 /* Must be a directory. */
# define O_NOFOLLOW 0400000 /* Do not follow links. */
# define O_NOATIME 01000000 /* Do not set atime. */
# define O_CLOEXEC 02000000 /* Set close_on_exec. */
#endif
3 out of those 5 should not be wrapped like that.
I found similar issues with pread() and pwrite().
The standard http://pubs.opengroup.org/onlinepubs/9699919799/functions/pread.html states they should be included with <unistd.h>, but they aren't.
The manpages state that _POSIX_C_SOURCE >= 200809L would include them, but it doesn't seem to help.
<unistd.h> contains the following:
#ifdef __USE_UNIX98
# ifndef __USE_FILE_OFFSET64
/* Read NBYTES into BUF from FD at the given position OFFSET without
changing the file pointer. Return the number read, -1 for errors
or 0 for EOF.
This function is a cancellation point and therefore not marked with
__THROW. */
extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
__off_t __offset) __wur;
/* Write N bytes of BUF to FD at the given position OFFSET without
changing the file pointer. Return the number written, or -1.
This function is a cancellation point and therefore not marked with
__THROW. */
extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n,
__off_t __offset) __wur;
Adding -D__USE_UNIX98 when compiling fixes the problem, but that shouldn't be needed.
This problem seems to be quite widespread. Adding -D_POSIX_C_SOURCE=200809L for example seems to no longer include many functions which should
be included as part of POSIX.1-2008, such as the *at() functions.
-- System Information:
Debian Release: 6.0
APT prefers unstable
APT policy: (700, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libc6-dev depends on:
ii libc-dev-bin 2.11.2-9 Embedded GNU C Library: Developmen
ii libc6 2.11.2-9 Embedded GNU C Library: Shared lib
ii linux-libc-dev 2.6.32-30 Linux support headers for userspac
Versions of packages libc6-dev recommends:
ii gcc [c-compiler] 4:4.4.5-2 The GNU C compiler
ii gcc-4.3 [c-compiler] 4.3.5-4 The GNU C compiler
ii gcc-4.4 [c-compiler] 4.4.5-10 The GNU C compiler
ii gcc-4.5 [c-compiler] 4.5.2-1 The GNU C compiler
Versions of packages libc6-dev suggests:
pn glibc-doc <none> (no description available)
ii manpages-dev 3.27-1 Manual pages about using GNU/Linux
-- no debconf information
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