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linux-user: Use safe_syscall for read and write system calls 

Restart read() and write() if signals occur before, or during with SA_RESTART

Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk>
Message-id: 1441497448-32489-15-git-send-email-T.E.Baldwin99@members.leeds.ac.uk
[PMM: Update to new safe_syscall() convention of setting errno]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Timothy E Baldwin 2016-05-12 18:47:47 +01:00 committed by Riku Voipio
parent 4d330cee37
commit 50afd02b84
1 changed files with 5 additions and 2 deletions
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7
linux-user/syscall.c
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@ -707,6 +707,9 @@ static type safe_##name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
return safe_syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5, arg6); \
}
safe_syscall3(ssize_t, read, int, fd, void *, buff, size_t, count)
safe_syscall3(ssize_t, write, int, fd, const void *, buff, size_t, count)
static inline int host_to_target_sock_type(int host_type)
{
int target_type;
@ -5983,7 +5986,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
else {
if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
goto efault;
ret = get_errno(read(arg1, p, arg3));
ret = get_errno(safe_read(arg1, p, arg3));
if (ret >= 0 &&
fd_trans_host_to_target_data(arg1)) {
ret = fd_trans_host_to_target_data(arg1)(p, ret);
@ -5994,7 +5997,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
case TARGET_NR_write:
if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
goto efault;
ret = get_errno(write(arg1, p, arg3));
ret = get_errno(safe_write(arg1, p, arg3));
unlock_user(p, arg2, 0);
break;
#ifdef TARGET_NR_open