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authorEdgar E. Iglesias <edgar.iglesias@gmail.com>2013-09-23 14:11:53 +0200
committerRiku Voipio <riku.voipio@linaro.org>2013-09-24 10:47:07 +0300
commit53d09b761f032f50c4424e8649396a9041070bae (patch)
treee670304a2aabd0a3217b674b7f33142f8647ccf2 /linux-user/syscall.c
parent89aaf1a6ad91c4cb3224fcca461d71dac9fa3fa6 (diff)
linux-user: Handle SOCK_CLOEXEC/NONBLOCK if unavailable on host
If the host lacks SOCK_CLOEXEC, bail out with -EINVAL. If the host lacks SOCK_ONONBLOCK, try to emulate it with fcntl() and O_NONBLOCK. Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user/syscall.c')
-rw-r--r--linux-user/syscall.c40
1 files changed, 37 insertions, 3 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index b3822b32a0..4a14a43037 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1773,7 +1773,7 @@ static void unlock_iovec(struct iovec *vec, abi_ulong target_addr,
free(vec);
}
-static inline void target_to_host_sock_type(int *type)
+static inline int target_to_host_sock_type(int *type)
{
int host_type = 0;
int target_type = *type;
@@ -1790,22 +1790,56 @@ static inline void target_to_host_sock_type(int *type)
break;
}
if (target_type & TARGET_SOCK_CLOEXEC) {
+#if defined(SOCK_CLOEXEC)
host_type |= SOCK_CLOEXEC;
+#else
+ return -TARGET_EINVAL;
+#endif
}
if (target_type & TARGET_SOCK_NONBLOCK) {
+#if defined(SOCK_NONBLOCK)
host_type |= SOCK_NONBLOCK;
+#elif !defined(O_NONBLOCK)
+ return -TARGET_EINVAL;
+#endif
}
*type = host_type;
+ return 0;
+}
+
+/* Try to emulate socket type flags after socket creation. */
+static int sock_flags_fixup(int fd, int target_type)
+{
+#if !defined(SOCK_NONBLOCK) && defined(O_NONBLOCK)
+ if (target_type & TARGET_SOCK_NONBLOCK) {
+ int flags = fcntl(fd, F_GETFL);
+ if (fcntl(fd, F_SETFL, O_NONBLOCK | flags) == -1) {
+ close(fd);
+ return -TARGET_EINVAL;
+ }
+ }
+#endif
+ return fd;
}
/* do_socket() Must return target values and target errnos. */
static abi_long do_socket(int domain, int type, int protocol)
{
- target_to_host_sock_type(&type);
+ int target_type = type;
+ int ret;
+
+ ret = target_to_host_sock_type(&type);
+ if (ret) {
+ return ret;
+ }
if (domain == PF_NETLINK)
return -EAFNOSUPPORT; /* do not NETLINK socket connections possible */
- return get_errno(socket(domain, type, protocol));
+ ret = get_errno(socket(domain, type, protocol));
+ if (ret >= 0) {
+ ret = sock_flags_fixup(ret, target_type);
+ }
+ return ret;
}
/* do_bind() Must return target values and target errnos. */