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- From: "Peter S. Mazinger" <ps.m@gmx.net>
- Date: Tue, 26 Apr 2011 23:03:44 +0200
- Subject: [PATCH] add posix_madvise.c
- Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
- Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
- ---
- create mode 100644 libc/sysdeps/linux/common/posix_madvise.c
- --- a/libc/sysdeps/linux/common/Makefile.in
- +++ b/libc/sysdeps/linux/common/Makefile.in
- @@ -81,7 +81,7 @@ CSRC-$(UCLIBC_HAS_REALTIME) += clock_get
- sched_get_priority_max.c sched_get_priority_min.c sched_getscheduler.c \
- sched_rr_get_interval.c sched_setparam.c sched_setscheduler.c sigqueue.c
- # clock_getcpuclockid|clock_nanosleep|mq_timedreceive|mq_timedsend|posix_fadvise|posix_fallocate|posix_madvise|posix_memalign|posix_mem_offset|posix_spawnattr_destroy|posix_spawnattr_init|posix_spawnattr_getflags|posix_spawnattr_setflags|posix_spawnattr_getpgroup|posix_spawnattr_setpgroup|posix_spawnattr_getschedparam|posix_spawnattr_setschedparam|posix_spawnattr_getschedpolicy|posix_spawnattr_setschedpolicy|posix_spawnattr_getsigdefault|posix_spawnattr_setsigdefault|posix_spawnattr_getsigmask|posix_spawnattr_setsigmask|posix_spawnattr_init|posix_spawnattr_setflags|posix_spawnattr_setpgroup|posix_spawnattr_setschedparam|posix_spawnattr_setschedpolicy|posix_spawnattr_setsigdefault|posix_spawnattr_setsigmask|posix_spawn_file_actions_addclose|posix_spawn_file_actions_addopen|posix_spawn_file_actions_adddup2|posix_spawn_file_actions_addopen|posix_spawn_file_actions_destroy|posix_spawn_file_actions_init|posix_spawn_file_actions_init|posix_spawn|posix_spawnp|posix_spawnp|posix_typed_mem_get_info|pthread_mutex_timedlock|sem_timedwait
- -CSRC-$(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
- --- /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 <sys/mman.h>
- +#include <sys/syscall.h>
- +
- +#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
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