summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorIlya Palachev <i.palachev@samsung.com>2014-12-17 10:55:55 (GMT)
committerIlya Palachev <i.palachev@samsung.com>2014-12-17 11:53:18 (GMT)
commit77f41a5cae59c0faa5384af809649f42e6667144 (patch)
tree0d218da3fc585949ef288eb0fdbaeede371e7e30
parent1b2063324897e07f2f16e6f9867bde080d2851ae (diff)
downloadqemu-77f41a5cae59c0faa5384af809649f42e6667144.zip
qemu-77f41a5cae59c0faa5384af809649f42e6667144.tar.gz
qemu-77f41a5cae59c0faa5384af809649f42e6667144.tar.bz2
According to official standard POSIX.1-2001. pread64 and pwrite64 should return 0 for zero-length buffers as mentioned at http://pubs.opengroup.org/onlinepubs/009695399/functions/read.html http://pubs.opengroup.org/onlinepubs/009695399/functions/write.html Change-Id: Icd66ea29658329fbd5e6461d1def0c78c81d2671 Signed-off-by: Ilya Palachev <i.palachev@samsung.com>
-rw-r--r--linux-user/syscall.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index a41dd43..a08f5ef 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8127,6 +8127,10 @@ abi_long do_syscall(void *cpu_env, int num, abi_ulong arg1,
arg4 = arg5;
arg5 = arg6;
}
+ if (!arg3) {
+ ret = 0;
+ break;
+ }
if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
goto efault;
ret = get_errno(pread64(arg1, p, arg3, target_offset64(arg4, arg5)));
@@ -8137,6 +8141,10 @@ abi_long do_syscall(void *cpu_env, int num, abi_ulong arg1,
arg4 = arg5;
arg5 = arg6;
}
+ if (!arg3) {
+ ret = 0;
+ break;
+ }
if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
goto efault;
ret = get_errno(pwrite64(arg1, p, arg3, target_offset64(arg4, arg5)));