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authorSamuel Thibault <samuel.thibault@gnu.org>2014-08-28 00:11:54 +0200
committerSamuel Thibault <samuel.thibault@ens-lyon.org>2014-08-28 00:46:44 +0200
commitb0f955c9ac70181532e93aa78c49c204c2a31dfd (patch)
tree250b5bb13381c37ef41c3ebcb3c0d91093e165fe
parent45ef66289acbab17278a73512f9b2a9d8a7ca79d (diff)
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Simplify atomicity of socket creation in bind.
-rw-r--r--ChangeLog7
-rw-r--r--sysdeps/mach/hurd/bind.c40
2 files changed, 25 insertions, 22 deletions
diff --git a/ChangeLog b/ChangeLog
index 6261ed481c5..8d1eef45583 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2014-08-27 Samuel Thibault <samuel.thibault@ens-lyon.org>
+
+ Simplify atomicity of socket creation in bind.
+
+ * sysdeps/mach/hurd/bind.c (__bind): Use dir_lookup(node, "") instead of
+ looking up the name after linking the file.
+
2014-08-27 Allan McRae <allan@archlinux.org>
* sysdeps/i386/fpu/libm-test-ulps: Update ULPs.
diff --git a/sysdeps/mach/hurd/bind.c b/sysdeps/mach/hurd/bind.c
index 17ef22a7d06..9bd668c4e7a 100644
--- a/sysdeps/mach/hurd/bind.c
+++ b/sysdeps/mach/hurd/bind.c
@@ -39,7 +39,7 @@ __bind (int fd, __CONST_SOCKADDR_ARG addrarg, socklen_t len)
{
/* For the local domain, we must create a node in the filesystem
using the ifsock translator and then fetch the address from it. */
- file_t dir, node;
+ file_t dir, node, ifsock;
char name[len - offsetof (struct sockaddr_un, sun_path) + 1], *n;
strncpy (name, addr->sun_path, sizeof name - 1);
@@ -63,36 +63,32 @@ __bind (int fd, __CONST_SOCKADDR_ARG addrarg, socklen_t len)
MACH_MSG_TYPE_COPY_SEND);
if (! err)
{
- /* Link the node, now a socket, into the target directory. */
- err = __dir_link (dir, node, n, 1);
- if (err == EEXIST)
+ enum retry_type doretry;
+ char retryname[1024];
+ /* Get a port to the ifsock translator. */
+ err = __dir_lookup (node, "", 0, 0, &doretry, retryname, &ifsock);
+ if (! err && (doretry != FS_RETRY_NORMAL || retryname[0] != '\0'))
err = EADDRINUSE;
}
- __mach_port_deallocate (__mach_task_self (), node);
if (! err)
{
- /* Get a port to the ifsock translator. */
- file_t ifsock = __file_name_lookup_under (dir, n, 0, 0);
- if (ifsock == MACH_PORT_NULL)
+ /* Get the address port. */
+ err = __ifsock_getsockaddr (ifsock, &aport);
+ if (err == MIG_BAD_ID || err == EOPNOTSUPP)
+ err = EGRATUITOUS;
+ if (! err)
{
- err = errno;
- /* If we failed, get rid of the node we created. */
- __dir_unlink (dir, n);
- }
- else
- {
- /* Get the address port. */
- err = __ifsock_getsockaddr (ifsock, &aport);
- if (err == MIG_BAD_ID || err == EOPNOTSUPP)
- /* We are not talking to /hurd/ifsock. Probably
- someone came in after we linked our node, unlinked
- it, and replaced it with a different node, before we
- did our lookup. Treat it as if our link had failed
- with EEXIST. */
+ /* Link the node, now a socket with proper mode, into the
+ target directory. */
+ err = __dir_link (dir, node, n, 1);
+ if (err == EEXIST)
err = EADDRINUSE;
+ if (err)
+ __mach_port_deallocate (__mach_task_self (), aport);
}
__mach_port_deallocate (__mach_task_self (), ifsock);
}
+ __mach_port_deallocate (__mach_task_self (), node);
}
__mach_port_deallocate (__mach_task_self (), dir);