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[Qemu-devel] [PATCH] linux-user: Emulate SOCK_CLOEXEC/NONBLOCK if unavai
From: |
edgar . iglesias |
Subject: |
[Qemu-devel] [PATCH] linux-user: Emulate SOCK_CLOEXEC/NONBLOCK if unavailable |
Date: |
Mon, 16 Sep 2013 15:08:06 +0200 |
From: "Edgar E. Iglesias" <address@hidden>
If the host lacks support for SOCK_CLOEXEC or SOCK_NONBLOCK,
try to emulate them with fcntl() FD_CLOEXEC and O_NONBLOCK.
Signed-off-by: Edgar E. Iglesias <address@hidden>
---
linux-user/syscall.c | 48 +++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 45 insertions(+), 3 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index c62d875..6aa8cd7 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1701,7 +1701,7 @@ 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;
@@ -1718,22 +1718,64 @@ 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;
+#elif !defined(FD_CLOEXEC)
+ 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_CLOEXEC) && defined(FD_CLOEXEC)
+ if (target_type & TARGET_SOCK_CLOEXEC) {
+ if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) {
+ close(fd);
+ return -TARGET_EINVAL;
+ }
+ }
+#endif
+#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. */
--
1.7.10.4
- [Qemu-devel] [PATCH] linux-user: Emulate SOCK_CLOEXEC/NONBLOCK if unavailable,
edgar . iglesias <=