[PATCH v3 47/48] ldso: Use newer syscalls if arch does not have the deprecated syscalls
Markos Chandras
markos.chandras at gmail.com
Wed Jan 23 11:42:11 UTC 2013
From: Markos Chandras <markos.chandras at imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras at imgtec.com>
---
ldso/include/dl-syscall.h | 33 ++++++++++++++++++++++++++++++++-
ldso/include/ldso.h | 4 ++++
2 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/ldso/include/dl-syscall.h b/ldso/include/dl-syscall.h
index acfef52..b383f48 100644
--- a/ldso/include/dl-syscall.h
+++ b/ldso/include/dl-syscall.h
@@ -23,7 +23,7 @@ extern int _dl_errno;
/* Pull in whatever this particular arch's kernel thinks the kernel version of
* struct stat should look like. It turns out that each arch has a different
* opinion on the subject, and different kernel revs use different names... */
-#if defined(__sparc_v9__) && (__WORDSIZE == 64)
+#if !defined(__NR_stat) || (defined(__sparc_v9__) && (__WORDSIZE == 64))
#define kernel_stat64 stat
#else
#define kernel_stat stat
@@ -48,9 +48,18 @@ static __always_inline _syscall1(void, _dl_exit, int, status)
#define __NR__dl_close __NR_close
static __always_inline _syscall1(int, _dl_close, int, fd)
+#if defined(__NR_openat) && !defined(__NR_open)
+static __always_inline int _dl_open(const char *fn,
+ int flags, __kernel_mode_t mode)
+{
+ return INLINE_SYSCALL(openat, 4, AT_FDCWD, fn, flags, mode);
+}
+
+#elif defined(__NR_open)
#define __NR__dl_open __NR_open
static __always_inline _syscall3(int, _dl_open, const char *, fn, int, flags,
__kernel_mode_t, mode)
+#endif
#define __NR__dl_write __NR_write
static __always_inline _syscall3(unsigned long, _dl_write, int, fd,
@@ -64,11 +73,27 @@ static __always_inline _syscall3(unsigned long, _dl_read, int, fd,
static __always_inline _syscall3(int, _dl_mprotect, const void *, addr,
unsigned long, len, int, prot)
+#if defined(__NR_fstatat64) && !defined(__NR_stat)
+#define __NR__dl_fstatat64 __NR_fstatat64
+static __always_inline _syscall4(int, _dl_fstatat64, int, fd, const char *,
+ fn, struct stat *, stat, int, flags)
+
+static __always_inline int _dl_stat(const char *file_name,
+ struct stat *buf)
+{
+ return _dl_fstatat64(AT_FDCWD, file_name, buf, 0);
+}
+#elif defined(__NR_stat)
#define __NR__dl_stat __NR_stat
static __always_inline _syscall2(int, _dl_stat, const char *, file_name,
struct stat *, buf)
+#endif
+#if defined(__NR_fstat64) && !defined(__NR_fstat)
+#define __NR__dl_fstat __NR_fstat64
+#elif defined(__NR_fstat)
#define __NR__dl_fstat __NR_fstat
+#endif
static __always_inline _syscall2(int, _dl_fstat, int, fd, struct stat *, buf)
#define __NR__dl_munmap __NR_munmap
@@ -104,9 +129,15 @@ static __always_inline _syscall0(gid_t, _dl_getegid)
#define __NR__dl_getpid __NR_getpid
static __always_inline _syscall0(gid_t, _dl_getpid)
+#if defined(__NR_readlinkat) && !defined(__NR_readlink)
+#define __NR__dl_readlink __NR_readlinkat
+static __always_inline _syscall4(int, _dl_readlink, int, id, const char *, path,
+ char *, buf, size_t, bufsiz)
+#elif defined(__NR_readlink)
#define __NR__dl_readlink __NR_readlink
static __always_inline _syscall3(int, _dl_readlink, const char *, path, char *, buf,
size_t, bufsiz)
+#endif
#ifdef __NR_pread64
#define __NR___syscall_pread __NR_pread64
diff --git a/ldso/include/ldso.h b/ldso/include/ldso.h
index e0671f7..1e04653 100644
--- a/ldso/include/ldso.h
+++ b/ldso/include/ldso.h
@@ -30,6 +30,10 @@
#include <stddef.h> /* for ptrdiff_t */
#include <stdbool.h>
#define _FCNTL_H
+/* We need this if arch has only new syscalls defined */
+#ifndef AT_FDCWD
+#define AT_FDCWD -100
+#endif /* AT_FDCWD */
#include <bits/fcntl.h>
#include <bits/wordsize.h>
/* Pull in the arch specific type information */
--
1.8.1.1
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