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Simplify atomicity of socket creation in bind.

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This commit is contained in:
Samuel Thibault
2014-08-28 00:11:54 +02:00
committed by Samuel Thibault
parent 45ef66289a
commit b0f955c9ac
2 changed files with 25 additions and 22 deletions
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40
sysdeps/mach/hurd/bind.c
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@ -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);