[Qemu-devel] [PATCH 12/18] linux-user: Use safe_syscall wrapper for accept and accept4 syscalls

[Peter Maydell <peter.maydell@linaro.org>]

Use the safe_syscall wrapper for the accept and accept4 syscalls.
accept4 has been in the kernel since 2.6.28 so we can assume it
is always present.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 linux-user/syscall.c | 23 ++++-------------------
 1 file changed, 4 insertions(+), 19 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 8682ab0..aac2bbd 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -708,6 +708,8 @@ safe_syscall3(ssize_t, recvmsg, int, fd, struct msghdr *, msg, int, flags)
 safe_syscall2(int, flock, int, fd, int, operation)
 safe_syscall4(int, rt_sigtimedwait, const sigset_t *, these, siginfo_t *, uinfo,
               const struct timespec *, uts, size_t, sigsetsize)
+safe_syscall4(int, accept4, int, fd, struct sockaddr *, addr, socklen_t *, len,
+              int, flags)
 safe_syscall2(int, nanosleep, const struct timespec *, req,
               struct timespec *, rem)
 #ifdef TARGET_NR_clock_nanosleep
@@ -2427,19 +2429,6 @@ static abi_long do_sendrecvmmsg(int fd, abi_ulong target_msgvec,
     return ret;
 }
 
-/* If we don't have a system accept4() then just call accept.
- * The callsites to do_accept4() will ensure that they don't
- * pass a non-zero flags argument in this config.
- */
-#ifndef CONFIG_ACCEPT4
-static inline int accept4(int sockfd, struct sockaddr *addr,
-                          socklen_t *addrlen, int flags)
-{
-    assert(flags == 0);
-    return accept(sockfd, addr, addrlen);
-}
-#endif
-
 /* do_accept4() Must return target values and target errnos. */
 static abi_long do_accept4(int fd, abi_ulong target_addr,
                            abi_ulong target_addrlen_addr, int flags)
@@ -2452,7 +2441,7 @@ static abi_long do_accept4(int fd, abi_ulong target_addr,
     host_flags = target_to_host_bitmask(flags, fcntl_flags_tbl);
 
     if (target_addr == 0) {
-        return get_errno(accept4(fd, NULL, NULL, host_flags));
+        return get_errno(safe_accept4(fd, NULL, NULL, host_flags));
     }
 
     /* linux returns EINVAL if addrlen pointer is invalid */
@@ -2468,7 +2457,7 @@ static abi_long do_accept4(int fd, abi_ulong target_addr,
 
     addr = alloca(addrlen);
 
-    ret = get_errno(accept4(fd, addr, &addrlen, host_flags));
+    ret = get_errno(safe_accept4(fd, addr, &addrlen, host_flags));
     if (!is_error(ret)) {
         host_to_target_sockaddr(target_addr, addr, addrlen);
         if (put_user_u32(addrlen, target_addrlen_addr))
@@ -7693,11 +7682,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #endif
 #ifdef TARGET_NR_accept4
     case TARGET_NR_accept4:
-#ifdef CONFIG_ACCEPT4
         ret = do_accept4(arg1, arg2, arg3, arg4);
-#else
-        goto unimplemented;
-#endif
         break;
 #endif
 #ifdef TARGET_NR_bind
-- 
1.9.1