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* sysdeps/posix/sysconf.c (__sysconf): Use #if _POSIX_FOO > 0

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rather than #ifdef _POSIX_FOO for options.  We should return -1
	at runtime for an option defined to 0 at compile time.

	* sysdeps/mach/hurd/bits/posix_opt.h: Define many missing options,
	many to -1 or 0.

2006-03-05  Roland McGrath  <roland@redhat.com>

	* sysdeps/unix/sysv/linux/sysconf.c (__sysconf)
	[__NR_clock_getres || HP_TIMING_AVAIL]: Handle _SC_CPUTIME,
	_SC_THREAD_CPUTIME.
This commit is contained in:
Roland McGrath
2006-03-06 02:51:01 +00:00
parent 7ccbe1a133
commit 182ed12e71
4 changed files with 215 additions and 92 deletions
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24
sysdeps/unix/sysv/linux/sysconf.c
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@@ -1,5 +1,5 @@
/* Get file-specific information about a file. Linux version.
Copyright (C) 2003, 2004 Free Software Foundation, Inc.
Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -48,6 +48,28 @@ __sysconf (int name)
}
#endif
#if defined __NR_clock_getres || HP_TIMING_AVAIL
case _SC_CPUTIME:
case _SC_THREAD_CPUTIME:
{
/* If we have HP_TIMING, we will fall back on that if the system
call does not work, so we support it either way. */
# if !HP_TIMING_AVAIL
/* Check using the clock_getres system call. */
struct timespec ts;
INTERNAL_SYSCALL_DECL (err);
int r = INTERNAL_SYSCALL (clock_getres, err, 2,
(name == _SC_CPUTIME
? CLOCK_PROCESS_CPUTIME_ID
: CLOCK_THREAD_CPUTIME_ID),
&ts);
if (INTERNAL_SYSCALL_ERROR_P (r, err))
return -1;
# endif
return _POSIX_VERSION;
}
#endif
case _SC_NGROUPS_MAX:
/* Try to read the information from the /proc/sys/kernel/ngroups_max
file. */