[git commit] lseek, lseek64: add cancellation for all THREADS
Bernhard Reutner-Fischer
rep.dot.nop at gmail.com
Fri Jun 15 12:00:41 UTC 2012
commit: http://git.uclibc.org/uClibc/commit/?id=24edbbd53a382f35a4365ae065f61d56579f52f1
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/master
LT_OLD provides cancellable versions, do it for all THREADS.
llseek.c: use newly added macros for offset handling.
Add a comment about endianness issue around offset.
Compile llseek.c only on 32bit archs.
Provide aliases for 64bit archs or if syscall is not available.
Signed-off-by: Peter S. Mazinger <ps.m at gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop at gmail.com>
---
include/unistd.h | 6 ++++++
libc/sysdeps/linux/common/llseek.c | 28 +++++++++++-----------------
libc/sysdeps/linux/common/lseek.c | 24 +++++++++++-------------
3 files changed, 28 insertions(+), 30 deletions(-)
diff --git a/include/unistd.h b/include/unistd.h
index 2fb7271..aa8e1e6 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -333,7 +333,10 @@ extern int faccessat (int __fd, __const char *__file, int __type, int __flag)
Return the new file position. */
#ifndef __USE_FILE_OFFSET64
extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW;
+# ifdef _LIBC
+extern __typeof(lseek) __lseek_nocancel attribute_hidden;
libc_hidden_proto(lseek)
+# endif
#else
# ifdef __REDIRECT_NTH
extern __off64_t __REDIRECT_NTH (lseek,
@@ -346,7 +349,10 @@ extern __off64_t __REDIRECT_NTH (lseek,
#ifdef __USE_LARGEFILE64
extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence)
__THROW;
+# ifdef _LIBC
+extern __typeof(lseek64) __lseek64_nocancel attribute_hidden;
libc_hidden_proto(lseek64)
+# endif
#endif
/* Close the file descriptor FD.
diff --git a/libc/sysdeps/linux/common/llseek.c b/libc/sysdeps/linux/common/llseek.c
index 333770a..09f5435 100644
--- a/libc/sysdeps/linux/common/llseek.c
+++ b/libc/sysdeps/linux/common/llseek.c
@@ -9,30 +9,24 @@
#include <_lfs_64.h>
#include <sys/syscall.h>
-#include <unistd.h>
-#include <stdint.h>
+#include <bits/wordsize.h>
/* Newer kernel ports have llseek() instead of _llseek() */
#if !defined __NR__llseek && defined __NR_llseek
# define __NR__llseek __NR_llseek
#endif
-#ifdef __NR__llseek
-off64_t lseek64(int fd, off64_t offset, int whence)
+#if defined __NR__llseek && __WORDSIZE == 32
+# include <unistd.h>
+# include <endian.h>
+# include <cancel.h>
+off64_t __NC(lseek64)(int fd, off64_t offset, int whence)
{
off64_t result;
- return (off64_t)INLINE_SYSCALL(_llseek, 5, fd, (off_t) (offset >> 32),
- (off_t) (offset & 0xffffffff), &result, whence) ?: result;
+ /* do we not need to handle the offset with __LONG_LONG_PAIR depending on endianness? */
+ return (off64_t)INLINE_SYSCALL(_llseek, 5, fd, (off_t) OFF64_HI(offset),
+ (off_t) OFF64_LO(offset), &result, whence) ?: result;
}
-#else
-off64_t lseek64(int fd, off64_t offset, int whence)
-{
- return (off64_t)lseek(fd, (off_t) (offset), whence);
-}
-#endif
-#ifndef __LINUXTHREADS_OLD__
-libc_hidden_def(lseek64)
-#else
-libc_hidden_weak(lseek64)
-strong_alias(lseek64,__libc_lseek64)
+CANCELLABLE_SYSCALL(off64_t, lseek64, (int fd, off64_t offset, int whence), (fd, offset, whence))
+lt_libc_hidden(lseek64)
#endif
diff --git a/libc/sysdeps/linux/common/lseek.c b/libc/sysdeps/linux/common/lseek.c
index 1ed956e..688f2d0 100644
--- a/libc/sysdeps/linux/common/lseek.c
+++ b/libc/sysdeps/linux/common/lseek.c
@@ -9,19 +9,16 @@
#include <sys/syscall.h>
#include <unistd.h>
+#include <cancel.h>
#ifdef __NR_lseek
-_syscall3(__off_t, lseek, int, fildes, __off_t, offset, int, whence)
-#elif defined __UCLIBC_HAS_LFS__ && defined __NR__llseek /* avoid circular dependency */
-__off_t lseek(int fildes, __off_t offset, int whence)
-{
- return lseek64(fildes, offset, whence);
-}
+# define __NR___lseek_nocancel __NR_lseek
+_syscall3(off_t, __NC(lseek), int, fd, off_t, offset, int, whence)
#else
# include <errno.h>
-__off_t lseek(int fildes, __off_t offset attribute_unused, int whence)
+off_t __NC(lseek)(int fd, off_t offset attribute_unused, int whence)
{
- if (fildes < 0) {
+ if (fd < 0) {
__set_errno(EBADF);
return -1;
}
@@ -40,9 +37,10 @@ __off_t lseek(int fildes, __off_t offset attribute_unused, int whence)
return -1;
}
#endif
-#ifndef __LINUXTHREADS_OLD__
-libc_hidden_def(lseek)
-#else
-libc_hidden_weak(lseek)
-strong_alias(lseek,__libc_lseek)
+CANCELLABLE_SYSCALL(off_t, lseek, (int fd, off_t offset, int whence), (fd, offset, whence))
+lt_libc_hidden(lseek)
+#if defined __UCLIBC_HAS_LFS__ && (__WORDSIZE == 64 || !defined __NR__llseek)
+strong_alias_untyped(__NC(lseek),__NC(lseek64))
+strong_alias_untyped(lseek,lseek64)
+lt_libc_hidden(lseek64)
#endif
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