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| author | Ulrich Drepper <drepper@redhat.com> | 2007-12-10 23:51:42 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2007-12-10 23:51:42 +0000 |
| commit | ae18718f58a619abf463eca538c497972d24e173 (patch) | |
| tree | f5846c2f572d694a81e6ec7d59b3c729550ef0c3 /sysdeps | |
| parent | b4354cf42008f12cac246759b64db0439a82ce67 (diff) | |
| download | glibc-ae18718f58a619abf463eca538c497972d24e173.tar.gz glibc-ae18718f58a619abf463eca538c497972d24e173.tar.xz glibc-ae18718f58a619abf463eca538c497972d24e173.zip | |
* sysdeps/unix/sysv/linux/adjtime.c: Use ADJ_OFFSET_SS_READ if
possible. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_ADJ_OFFSET_SS_READ): Define for 2.6.24. * sysdeps/unix/sysv/linux/sys/timex.h (ADJ_OFFSET_SS_READ): Define.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/adjtime.c | 24 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/kernel-features.h | 5 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/sys/timex.h | 3 |
3 files changed, 28 insertions, 4 deletions
diff --git a/sysdeps/unix/sysv/linux/adjtime.c b/sysdeps/unix/sysv/linux/adjtime.c index 38ef805cd5..202bb14485 100644 --- a/sysdeps/unix/sysv/linux/adjtime.c +++ b/sysdeps/unix/sysv/linux/adjtime.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1995, 1996, 1997, 1998, 2002, 2004 +/* Copyright (C) 1995, 1996, 1997, 1998, 2002, 2004, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -22,6 +22,8 @@ #include <sys/time.h> #include <sys/timex.h> +#include <kernel-features.h> + #define MAX_SEC (INT_MAX / 1000000L - 2) #define MIN_SEC (INT_MIN / 1000000L + 2) @@ -69,13 +71,29 @@ ADJTIME (const struct TIMEVAL *itv, struct TIMEVAL *otv) return -1; } tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L; +#ifdef ADJ_OFFSET_SS_READ + tntx.modes = ADJ_OFFSET_SS_READ; +#else tntx.modes = ADJ_OFFSET_SINGLESHOT; +#endif } else tntx.modes = 0; - if (ADJTIMEX (&tntx) < 0) - return -1; +#if defined ADJ_OFFSET_SS_READ && !defined __ASSUME_ADJ_OFFSET_SS_READ + again: +#endif + if (__builtin_expect (ADJTIMEX (&tntx) < 0, 0)) + { +#if defined ADJ_OFFSET_SS_READ && !defined __ASSUME_ADJ_OFFSET_SS_READ + if (itv && errno == EINVAL && tntx.modes == ADJ_OFFSET_SS_READ) + { + tntx.modes = ADJ_OFFSET_SINGLESHOT; + goto again; + } +#endif + return -1; + } if (otv) { diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h index aab3df348e..01baab0903 100644 --- a/sysdeps/unix/sysv/linux/kernel-features.h +++ b/sysdeps/unix/sysv/linux/kernel-features.h @@ -487,3 +487,8 @@ || (__LINUX_KERNEL_VERSION >= 0x020618 && defined __s390__)) # define __ASSUME_FALLOCATE 1 #endif + +/* Support for ADJ_OFFSET_SS_READ was added in 2.6.24. */ +#if __LINUX_KERNEL_VERSION >= 0x020618 +# define __ASSUME_ADJ_OFFSET_SS_READ 1 +#endif diff --git a/sysdeps/unix/sysv/linux/sys/timex.h b/sysdeps/unix/sysv/linux/sys/timex.h index 773a5ab8d0..f7bd6e7929 100644 --- a/sysdeps/unix/sysv/linux/sys/timex.h +++ b/sysdeps/unix/sysv/linux/sys/timex.h @@ -1,4 +1,4 @@ -/* Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc. +/* Copyright (C) 1995, 1996, 1997, 1999, 2007 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 @@ -69,6 +69,7 @@ struct timex #define ADJ_TIMECONST 0x0020 /* pll time constant */ #define ADJ_TICK 0x4000 /* tick value */ #define ADJ_OFFSET_SINGLESHOT 0x8001 /* old-fashioned adjtime */ +#define ADJ_OFFSET_SS_READ 0xa001 /* read-only adjtime */ /* xntp 3.4 compatibility names */ #define MOD_OFFSET ADJ_OFFSET |