Package: libc6-dev
Version: 2.10.2-6
Severity: wishlist
File issock.c:
----------------------------------------
#include <sys/stat.h>
int foo(mode_t mode) { return S_ISSOCK(mode); }
int main(int argc, char *argv[]) { return foo(0); }
----------------------------------------
Compilation results:
----------------------------------------
$ gcc -std=c99 -D_POSIX_C_SOURCE=200112L -o issock issock.c
issock.c: In function ‘foo’:
issock.c:2: warning: implicit declaration of function ‘S_ISSOCK’
/tmp/ccUoCGe4.o: In function `foo':
issock.c:(.text+0x16): undefined reference to `S_ISSOCK'
collect2: ld returned 1 exit status
$ gcc -std=c99 -D_POSIX_C_SOURCE=200809L -o issock issock.c
issock.c: In function ‘foo’:
issock.c:2: warning: implicit declaration of function ‘S_ISSOCK’
/tmp/ccsSvaAx.o: In function `foo':
issock.c:(.text+0x16): undefined reference to `S_ISSOCK'
collect2: ld returned 1 exit status
----------------------------------------
Using gcc -E -dM, it is possible to observe that S_ISSOCK does not get
defined as a macro at any point. With -D_GNU_SOURCE or no feature
test macros at all, issock.c compiles fine. /usr/include/sys/stat.h
on my machine has at line 146:
----------------------------------------
#if (defined __USE_BSD || defined __USE_UNIX98) \
&& defined __S_IFSOCK
# define S_ISSOCK(mode) __S_ISTYPE((mode), __S_IFSOCK)
#endif
----------------------------------------
This seems to be along the lines of only defining S_ISSOCK when BSD or
X/Open features are being selected (my glance at __USE_UNIX98 yielded
vague understanding at best), but according to [1], POSIX:2001
declares that sys/stat.h defines the macro S_ISSOCK without any
extension tags (such as the XSI tag), which would seem to me to make
it a POSIX feature.
[1] http://www.opengroup.org/onlinepubs/000095399/basedefs/sys/stat.h.html
---> Drake Wilson
-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (990, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.29-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages libc6-dev depends on:
ii libc-dev-bin 2.10.2-6 Embedded GNU C Library: Developmen
ii libc6 2.10.2-6 Embedded GNU C Library: Shared lib
ii linux-libc-dev 2.6.32-6 Linux support headers for userspac
Versions of packages libc6-dev recommends:
ii gcc [c-compiler] 4:4.4.2-3 The GNU C compiler
ii gcc-3.4 [c-compiler] 3.4.6-10 The GNU C compiler
ii gcc-4.3 [c-compiler] 4.3.4-6 The GNU C compiler
ii gcc-4.4 [c-compiler] 4.4.3-2 The GNU C compiler
Versions of packages libc6-dev suggests:
ii glibc-doc 2.10.2-5 Embedded GNU C Library: Documentat
ii manpages-dev 3.23-1 Manual pages about using GNU/Linux
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