From 93b8ce8886e30986be31c1403b606b6367dc258a Mon Sep 17 00:00:00 2001 From: "Peter S. Mazinger" Date: Tue, 26 Apr 2011 23:03:44 +0200 Subject: [PATCH] add posix_madvise.c Signed-off-by: Peter S. Mazinger Signed-off-by: Bernhard Reutner-Fischer Signed-off-by: Mike Frysinger --- libc/sysdeps/linux/common/Makefile.in | 2 +- libc/sysdeps/linux/common/posix_madvise.c | 25 +++++++++++++++++++++++++ 2 files changed, 26 insertions(+), 1 deletion(-) create mode 100644 libc/sysdeps/linux/common/posix_madvise.c diff --git a/libc/sysdeps/linux/common/Makefile.in b/libc/sysdeps/linux/common/Makefile.in index 3b5763c..b39082b 100644 --- a/libc/sysdeps/linux/common/Makefile.in +++ b/libc/sysdeps/linux/common/Makefile.in @@ -81,7 +81,7 @@ CSRC-$(UCLIBC_HAS_REALTIME) += clock_getres.c clock_gettime.c clock_settime.c \ sched_get_priority_max.c sched_get_priority_min.c sched_getscheduler.c \ sched_rr_get_interval.c sched_setparam.c sched_setscheduler.c sigqueue.c # clock_getcpuclockid|clock_nanosleep|mq_timedreceive|mq_timedsend|posix_fadvise|posix_fallocate|posix_madvise|posix_memalign|posix_mem_offset|posix_spawnattr_destroy|posix_spawnattr_init|posix_spawnattr_getflags|posix_spawnattr_setflags|posix_spawnattr_getpgroup|posix_spawnattr_setpgroup|posix_spawnattr_getschedparam|posix_spawnattr_setschedparam|posix_spawnattr_getschedpolicy|posix_spawnattr_setschedpolicy|posix_spawnattr_getsigdefault|posix_spawnattr_setsigdefault|posix_spawnattr_getsigmask|posix_spawnattr_setsigmask|posix_spawnattr_init|posix_spawnattr_setflags|posix_spawnattr_setpgroup|posix_spawnattr_setschedparam|posix_spawnattr_setschedpolicy|posix_spawnattr_setsigdefault|posix_spawnattr_setsigmask|posix_spawn_file_actions_addclose|posix_spawn_file_actions_addopen|posix_spawn_file_actions_adddup2|posix_spawn_file_actions_addopen|posix_spawn_file_actions_destroy|posix_spawn_file_actions_init|posix_spawn_file_actions_init|posix_spawn|posix_spawnp|posix_spawnp|posix_typed_mem_get_info|pthread_mutex_timedlock|sem_timedwait -CSRC-$(UCLIBC_HAS_ADVANCED_REALTIME) += posix_fadvise64.c posix_fadvise.c +CSRC-$(UCLIBC_HAS_ADVANCED_REALTIME) += posix_fadvise64.c posix_fadvise.c posix_madvise.c CSRC-$(UCLIBC_SUSV4_LEGACY) += utime.c CSRC-$(UCLIBC_HAS_EPOLL) += epoll.c CSRC-$(UCLIBC_HAS_XATTR) += xattr.c diff --git a/libc/sysdeps/linux/common/posix_madvise.c b/libc/sysdeps/linux/common/posix_madvise.c new file mode 100644 index 0000000..2f95bcb --- /dev/null +++ b/libc/sysdeps/linux/common/posix_madvise.c @@ -0,0 +1,25 @@ +/* vi: set sw=4 ts=4: */ +/* Licensed under the LGPL v2.1, see the file LICENSE in this tarball. */ + +#include +#include + +#if defined __NR_madvise && defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__ +int posix_madvise(void *addr, size_t len, int advice) +{ + int result; + /* We have one problem: the kernel's MADV_DONTNEED does not + * correspond to POSIX's POSIX_MADV_DONTNEED. The former simply + * discards changes made to the memory without writing it back to + * disk, if this would be necessary. The POSIX behaviour does not + * allow this. There is no functionality mapping for the POSIX + * behaviour so far so we ignore that advice for now. */ + if (advice == POSIX_MADV_DONTNEED) + return 0; + + /* this part might use madvise function */ + INTERNAL_SYSCALL_DECL (err); + result = INTERNAL_SYSCALL (madvise, err, 3, addr, len, advice); + return INTERNAL_SYSCALL_ERRNO (result, err); +} +#endif -- 1.7.10.4