diff options
Diffstat (limited to 'libc/sysdeps/unix/sysv/linux/kernel-features.h')
| -rw-r--r-- | libc/sysdeps/unix/sysv/linux/kernel-features.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/libc/sysdeps/unix/sysv/linux/kernel-features.h b/libc/sysdeps/unix/sysv/linux/kernel-features.h index 29afe2771..5478ce670 100644 --- a/libc/sysdeps/unix/sysv/linux/kernel-features.h +++ b/libc/sysdeps/unix/sysv/linux/kernel-features.h @@ -462,6 +462,13 @@ # define __ASSUME_SET_ROBUST_LIST 1 #endif +/* Pessimistically assume that 2.6.18 introduced real handling of + large numbers of requests to readv and writev and that we don't + need a fallback. It likely worked for much longer. */ +#if __LINUX_KERNEL_VERSION >= 0x020612 +# define __ASSUME_COMPLETE_READV_WRITEV 1 +#endif + /* Support for PI futexes was added in 2.6.18. */ #if __LINUX_KERNEL_VERSION >= 0x020612 # define __ASSUME_FUTEX_LOCK_PI 1 @@ -522,3 +529,11 @@ #if __LINUX_KERNEL_VERSION >= 0x02061d # define __ASSUME_FUTEX_CLOCK_REALTIME 1 #endif + +/* Support for preadv and pwritev was added in 2.6.30. */ +#if __LINUX_KERNEL_VERSION >= 0x02061e \ + && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \ + || defined __ia64__ || defined __sparc__) +# define __ASSUME_PREADV 1 +# define __ASSUME_PWRITEV 1 +#endif |