toolchain/uClibc/patches-0.9.33.2/021-add-posix_madvise.c.patch

   1 From: "Peter S. Mazinger" <ps.m@gmx.net>
   2 Date: Tue, 26 Apr 2011 23:03:44 +0200
   3 Subject: [PATCH] add posix_madvise.c
   4
   5 Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
   6 Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
   7 ---
   8  create mode 100644 libc/sysdeps/linux/common/posix_madvise.c
   9
  10 --- a/libc/sysdeps/linux/common/Makefile.in
  11 +++ b/libc/sysdeps/linux/common/Makefile.in
  12 @@ -81,7 +81,7 @@ CSRC-$(UCLIBC_HAS_REALTIME) += clock_get
  13         sched_get_priority_max.c sched_get_priority_min.c sched_getscheduler.c \
  14         sched_rr_get_interval.c sched_setparam.c sched_setscheduler.c sigqueue.c
  15  # clock_getcpuclockid|clock_nanosleep|mq_timedreceive|mq_timedsend|posix_fadvise|posix_fallocate|posix_madvise|posix_memalign|posix_mem_offset|posix_spawnattr_destroy|posix_spawnattr_init|posix_spawnattr_getflags|posix_spawnattr_setflags|posix_spawnattr_getpgroup|posix_spawnattr_setpgroup|posix_spawnattr_getschedparam|posix_spawnattr_setschedparam|posix_spawnattr_getschedpolicy|posix_spawnattr_setschedpolicy|posix_spawnattr_getsigdefault|posix_spawnattr_setsigdefault|posix_spawnattr_getsigmask|posix_spawnattr_setsigmask|posix_spawnattr_init|posix_spawnattr_setflags|posix_spawnattr_setpgroup|posix_spawnattr_setschedparam|posix_spawnattr_setschedpolicy|posix_spawnattr_setsigdefault|posix_spawnattr_setsigmask|posix_spawn_file_actions_addclose|posix_spawn_file_actions_addopen|posix_spawn_file_actions_adddup2|posix_spawn_file_actions_addopen|posix_spawn_file_actions_destroy|posix_spawn_file_actions_init|posix_spawn_file_actions_init|posix_spawn|posix_spawnp|posix_spawnp|posix_typed_mem_get_info|pthread_mutex_timedlock|sem_timedwait
  16 -CSRC-$(UCLIBC_HAS_ADVANCED_REALTIME) += posix_fadvise64.c posix_fadvise.c
  17 +CSRC-$(UCLIBC_HAS_ADVANCED_REALTIME) += posix_fadvise64.c posix_fadvise.c posix_madvise.c
  18  CSRC-$(UCLIBC_SUSV4_LEGACY) += utime.c
  19  CSRC-$(UCLIBC_HAS_EPOLL) += epoll.c
  20  CSRC-$(UCLIBC_HAS_XATTR) += xattr.c
  21 --- /dev/null
  22 +++ b/libc/sysdeps/linux/common/posix_madvise.c
  23 @@ -0,0 +1,25 @@
  24 +/* vi: set sw=4 ts=4: */
  25 +/* Licensed under the LGPL v2.1, see the file LICENSE in this tarball. */
  26 +
  27 +#include <sys/mman.h>
  28 +#include <sys/syscall.h>
  29 +
  30 +#if defined __NR_madvise && defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
  31 +int posix_madvise(void *addr, size_t len, int advice)
  32 +{
  33 +       int result;
  34 +       /* We have one problem: the kernel's MADV_DONTNEED does not
  35 +        * correspond to POSIX's POSIX_MADV_DONTNEED.  The former simply
  36 +        * discards changes made to the memory without writing it back to
  37 +        * disk, if this would be necessary.  The POSIX behaviour does not
  38 +        * allow this.  There is no functionality mapping for the POSIX
  39 +        * behaviour so far so we ignore that advice for now. */
  40 +       if (advice == POSIX_MADV_DONTNEED)
  41 +               return 0;
  42 +
  43 +       /* this part might use madvise function */
  44 +       INTERNAL_SYSCALL_DECL (err);
  45 +       result = INTERNAL_SYSCALL (madvise, err, 3, addr, len, advice);
  46 +       return INTERNAL_SYSCALL_ERRNO (result, err);
  47 +}
  48 +#endif