[PATCH 3/7] leek: if lseek syscall is not available, use lseek64 even for !LFS

Vineet Gupta Vineet.Gupta1 at synopsys.com
Mon Mar 11 13:21:50 UTC 2013


With Busybox and uClibc - both built w/o LFS, this caused ash to be
completely broken, as lseek was simply returning error.

Signed-off-by: Vineet Gupta <vgupta at synopsys.com>
Cc: Markos Chandras <markos.chandras at imgtec.com>
---
 libc/sysdeps/linux/common/lseek.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/libc/sysdeps/linux/common/lseek.c b/libc/sysdeps/linux/common/lseek.c
index 26953ae..500c6bf 100644
--- a/libc/sysdeps/linux/common/lseek.c
+++ b/libc/sysdeps/linux/common/lseek.c
@@ -15,11 +15,20 @@
 # define __NR___lseek_nocancel __NR_lseek
 _syscall3(off_t, __NC(lseek), int, fd, off_t, offset, int, whence)
 /* Use lseek64 if __NR_lseek is not defined but UCLIBC_HAS_LFS is enabled */
-#elif !defined __NR_lseek && defined __NR_llseek \
-	&& __WORDSIZE == 32 && __UCLIBC_HAS_LFS__
+#elif !defined __NR_lseek && defined __NR_llseek
+#include <endian.h>
 off_t __NC(lseek)(int fd, off_t offset, int whence)
 {
+#if defined __UCLIBC_HAS_LFS__
 	return lseek64(fd, offset, whence);
+#elif __WORDSIZE == 32
+	__off64_t result;
+	__off_t high = 0;
+	return INLINE_SYSCALL(llseek, 5, fd,
+				__LONG_LONG_PAIR(high, offset),
+				&result, whence) ?: result;
+#endif
+/* No need to handle __WORDSIZE == 64 as such a kernel won't define __NR_llseek */
 }
 #else
 # include <errno.h>
-- 
1.7.4.1



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