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linux-user: Implement accept4

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Implement the accept4 syscall (which is identical to accept
but has an additional flags argument).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Peter Maydell 2013-02-08 04:35:04 +00:00 committed by Riku Voipio
parent a8fd1aba85
commit a94b4987e2
1 changed files with 31 additions and 8 deletions
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39
linux-user/syscall.c
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@ -2004,16 +2004,30 @@ out2:
return ret;
}
/* do_accept() Must return target values and target errnos. */
static abi_long do_accept(int fd, abi_ulong target_addr,
abi_ulong target_addrlen_addr)
/* 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)
{
socklen_t addrlen;
void *addr;
abi_long ret;
if (target_addr == 0)
return get_errno(accept(fd, NULL, NULL));
if (target_addr == 0) {
return get_errno(accept4(fd, NULL, NULL, flags));
}
/* linux returns EINVAL if addrlen pointer is invalid */
if (get_user_u32(addrlen, target_addrlen_addr))
@ -2028,7 +2042,7 @@ static abi_long do_accept(int fd, abi_ulong target_addr,
addr = alloca(addrlen);
ret = get_errno(accept(fd, addr, &addrlen));
ret = get_errno(accept4(fd, addr, &addrlen, flags));
if (!is_error(ret)) {
host_to_target_sockaddr(target_addr, addr, addrlen);
if (put_user_u32(addrlen, target_addrlen_addr))
@ -2254,7 +2268,7 @@ static abi_long do_socketcall(int num, abi_ulong vptr)
|| get_user_ual(target_addrlen, vptr + 2 * n))
return -TARGET_EFAULT;
ret = do_accept(sockfd, target_addr, target_addrlen);
ret = do_accept4(sockfd, target_addr, target_addrlen, 0);
}
break;
case SOCKOP_getsockname:
@ -6677,7 +6691,16 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
#endif
#ifdef TARGET_NR_accept
case TARGET_NR_accept:
ret = do_accept(arg1, arg2, arg3);
ret = do_accept4(arg1, arg2, arg3, 0);
break;
#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