diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/clock_settime.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/clock_settime.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/clock_settime.c b/sysdeps/unix/sysv/linux/clock_settime.c index 31ba0225fb..731b7be7b8 100644 --- a/sysdeps/unix/sysv/linux/clock_settime.c +++ b/sysdeps/unix/sysv/linux/clock_settime.c @@ -16,10 +16,65 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ +#include <errno.h> #include <sysdep.h> +#include "kernel-posix-cpu-timers.h" #include <kernel-features.h> +#ifndef HAVE_CLOCK_GETTIME_VSYSCALL +# undef INTERNAL_VSYSCALL +# define INTERNAL_VSYSCALL INTERNAL_SYSCALL +# undef INLINE_VSYSCALL +# define INLINE_VSYSCALL INLINE_SYSCALL +#else +# include <bits/libc-vdso.h> +#endif + +#if __ASSUME_POSIX_CPU_TIMERS <= 0 && defined __NR_clock_settime +extern int __libc_missing_posix_timers attribute_hidden; +extern int __libc_missing_posix_cpu_timers attribute_hidden; + +static int +maybe_syscall_settime_cpu (clockid_t clock_id, const struct timespec *tp) +{ + int e = EINVAL; + + if (!__libc_missing_posix_cpu_timers) + { + INTERNAL_SYSCALL_DECL (err); + int r = INTERNAL_VSYSCALL (clock_settime, err, 2, clock_id, tp); + if (!INTERNAL_SYSCALL_ERROR_P (r, err)) + return 0; + + e = INTERNAL_SYSCALL_ERRNO (r, err); +# ifndef __ASSUME_POSIX_TIMERS + if (e == ENOSYS) + { + __libc_missing_posix_timers = 1; + __libc_missing_posix_cpu_timers = 1; + e = EINVAL; + } + else +# endif + { + if (e == EINVAL) + { + /* Check whether the kernel supports CPU clocks at all. + If not, record it for the future. */ + r = INTERNAL_VSYSCALL (clock_getres, err, 2, + MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED), + NULL); + if (INTERNAL_SYSCALL_ERROR_P (r, err)) + __libc_missing_posix_cpu_timers = 1; + } + } + } + + return e; +} +#endif + #ifdef __ASSUME_POSIX_TIMERS /* This means the REALTIME clock is definitely supported in the @@ -73,4 +128,22 @@ extern int __libc_missing_posix_timers attribute_hidden; # define HANDLED_REALTIME 1 #endif +#if __ASSUME_POSIX_CPU_TIMERS > 0 +# define HANDLED_CPUTIME 1 +# define SYSDEP_SETTIME_CPU \ + retval = INLINE_SYSCALL (clock_settime, 2, clock_id, tp) +#elif defined __NR_clock_settime +# define SYSDEP_SETTIME_CPU \ + retval = maybe_syscall_settime_cpu (clock_id, tp); \ + if (retval == 0) \ + break; \ + if (retval != EINVAL || !__libc_missing_posix_cpu_timers) \ + { \ + __set_errno (retval); \ + retval = -1; \ + break; \ + } \ + do { } while (0) +#endif + #include <sysdeps/unix/clock_settime.c> |