From: Thomas Weißschuh <thomas.weisssc...@linutronix.de>
Not all architectures have the old sys_lseek(), notably riscv32.
Implement lseek() in terms of sys_llseek() in that case.
Signed-off-by: Thomas Weißschuh <thomas.weisssc...@linutronix.de>
Signed-off-by: Thomas Weißschuh <li...@weissschuh.net>
---
tools/include/nolibc/sys.h | 29 ++++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index
8c0a55bc9dc3aacd110db0195975fe4f85480fc5..8f44c33b121300e80b41c971019484007d050b17
100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -597,10 +597,37 @@ off_t sys_lseek(int fd, off_t offset, int whence)
#endif
}
+static __attribute__((unused))
+int sys_llseek(int fd, unsigned long offset_high, unsigned long offset_low,
+ __kernel_loff_t *result, int whence)
+{
+#ifdef __NR_llseek
+ return my_syscall5(__NR_llseek, fd, offset_high, offset_low, result,
whence);
+#else
+ return __nolibc_enosys(__func__, fd, offset_high, offset_low, result,
whence);
+#endif
+}
+
static __attribute__((unused))
off_t lseek(int fd, off_t offset, int whence)
{
- return __sysret(sys_lseek(fd, offset, whence));
+ __kernel_loff_t loff = 0;
+ off_t result;
+ int ret;
+
+ result = sys_lseek(fd, offset, whence);
+ if (result == -ENOSYS) {
+ /* Only exists on 32bit where nolibc off_t is also 32bit */
+ ret = sys_llseek(fd, 0, offset, &loff, whence);
+ if (ret < 0)
+ result = ret;
+ else if (loff != (off_t)loff)
+ result = -EOVERFLOW;
+ else
+ result = loff;
+ }
+
+ return __sysret(result);
}
--
2.48.1
