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linux-user: Use safe_syscall for wait system calls 

Use safe_syscall for waitpid, waitid and wait4 syscalls. Note that this
change allows us to implement support for waitid's fifth (rusage) argument
in future; for the moment we ignore it as we have done up til now.

Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk>
Message-id: 1441497448-32489-18-git-send-email-T.E.Baldwin99@members.leeds.ac.uk
[PMM: Adjust to new safe_syscall convention. Add fifth waitid syscall argument
 (which isn't present in the libc interface but is in the syscall ABI)]
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 18:47:49 +01:00 committed by Riku Voipio
parent c10a07387b
commit 4af80a3783
1 changed files with 7 additions and 3 deletions
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10
linux-user/syscall.c
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@ -699,6 +699,10 @@ 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)
safe_syscall4(int, openat, int, dirfd, const char *, pathname, \
int, flags, mode_t, mode)
safe_syscall4(pid_t, wait4, pid_t, pid, int *, status, int, options, \
struct rusage *, rusage)
safe_syscall5(int, waitid, idtype_t, idtype, id_t, id, siginfo_t *, infop, \
int, options, struct rusage *, rusage)
static inline int host_to_target_sock_type(int host_type)
{
@ -6037,7 +6041,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
case TARGET_NR_waitpid:
{
int status;
ret = get_errno(waitpid(arg1, &status, arg3));
ret = get_errno(safe_wait4(arg1, &status, arg3, 0));
if (!is_error(ret) && arg2 && ret
&& put_user_s32(host_to_target_waitstatus(status), arg2))
goto efault;
@ -6049,7 +6053,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
{
siginfo_t info;
info.si_pid = 0;
ret = get_errno(waitid(arg1, arg2, &info, arg4));
ret = get_errno(safe_waitid(arg1, arg2, &info, arg4, NULL));
if (!is_error(ret) && arg3 && info.si_pid != 0) {
if (!(p = lock_user(VERIFY_WRITE, arg3, sizeof(target_siginfo_t), 0)))
goto efault;
@ -7761,7 +7765,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
rusage_ptr = &rusage;
else
rusage_ptr = NULL;
ret = get_errno(wait4(arg1, &status, arg3, rusage_ptr));
ret = get_errno(safe_wait4(arg1, &status, arg3, rusage_ptr));
if (!is_error(ret)) {
if (status_ptr && ret) {
status = host_to_target_waitstatus(status);