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 -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/20110122202651.13412.40364.reportbug@localhost
