uClibc: add another missing backport patch

[openwrt.git] / toolchain / uClibc / patches-0.9.33.2 / 021-add-posix_madvise.c.patch

diff --git a/toolchain/uClibc/patches-0.9.33.2/021-add-posix_madvise.c.patch b/toolchain/uClibc/patches-0.9.33.2/021-add-posix_madvise.c.patch
new file mode 100644 (file)
index 0000000..2b18c25
--- /dev/null
+++ b/toolchain/uClibc/patches-0.9.33.2/021-add-posix_madvise.c.patch
@@ -0,0 +1,48 @@
+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