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sysconf on Linux/ia64 reported outdate versions for some options

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The code is also cleaned up to avoid inefficiencies.
This commit is contained in:
Ulrich Drepper
2011-05-15 11:18:10 -04:00
parent 15a856b109
commit 3b85df2787
4 changed files with 47 additions and 44 deletions
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50
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, 2006, 2008, 2009 Free Software Foundation, Inc.
Copyright (C) 2003,2004,2006 2008,2009,2011 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
@ -35,6 +35,34 @@
static long int posix_sysconf (int name);
#ifndef HAS_CPUCLOCK
static long int
has_cpuclock (void)
{
# if defined __NR_clock_getres || HP_TIMING_AVAIL
/* 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;
# else
return -1;
# endif
}
# define HAS_CPUCLOCK() has_cpuclock ()
#endif
/* Get the value of the system variable NAME. */
long int
__sysconf (int name)
@ -56,27 +84,9 @@ __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
return HAS_CPUCLOCK ();
case _SC_ARG_MAX:
#if __LINUX_KERNEL_VERSION < 0x020617