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#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <net/netlib.h>
#include <sys/ioctl.h>
#include <sys/ioc_net.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#define DEBUG 0
static int _uds_socketpair(int type, int protocol, int sv[2]);
/*
* Create a pair of connected sockets.
*/
static int
__socketpair(int domain, int type, int protocol, int sv[2])
{
message m;
memset(&m, 0, sizeof(m));
m.m_lc_vfs_socket.domain = domain;
m.m_lc_vfs_socket.type = type;
m.m_lc_vfs_socket.protocol = protocol;
if (_syscall(VFS_PROC_NR, VFS_SOCKETPAIR, &m) < 0)
return -1;
sv[0] = m.m_vfs_lc_fdpair.fd0;
sv[1] = m.m_vfs_lc_fdpair.fd1;
return 0;
}
int
socketpair(int domain, int type, int protocol, int sv[2])
{
int r;
r = __socketpair(domain, type, protocol, sv);
if (r != -1 || (errno != EAFNOSUPPORT && errno != ENOSYS))
return r;
#if DEBUG
fprintf(stderr, "socketpair: domain %d, type %d, protocol %d\n",
domain, type, protocol);
#endif
if (domain == AF_UNIX)
return _uds_socketpair(type, protocol, sv);
errno = EAFNOSUPPORT;
return -1;
}
static int _uds_socketpair(int type, int protocol, int sv[2])
{
dev_t dev;
int r, i;
struct stat sbuf;
if (type != SOCK_STREAM && type != SOCK_SEQPACKET) {
errno = EPROTOTYPE;
return -1;
}
if (protocol != 0)
{
#if DEBUG
fprintf(stderr, "socketpair(uds): bad protocol %d\n", protocol);
#endif
errno= EPROTONOSUPPORT;
return -1;
}
/* in this 'for' loop two unconnected sockets are created */
for (i = 0; i < 2; i++) {
sv[i]= open(UDS_DEVICE, O_RDWR);
if (sv[i] == -1) {
int open_errno = errno;
if (i == 1) {
/* if we failed to open() the 2nd
* socket, we need to close the 1st
*/
close(sv[0]);
errno = open_errno;
}
return -1;
}
/* set the type for the socket via ioctl
* (SOCK_STREAM, SOCK_SEQPACKET, etc)
*/
r= ioctl(sv[i], NWIOSUDSTYPE, &type);
if (r == -1) {
int ioctl_errno;
/* if that failed rollback socket creation */
ioctl_errno= errno;
close(sv[i]);
if (i == 1) {
/* if we just closed the 2nd socket, we
* need to close the 1st
*/
close(sv[0]);
}
/* return the error thrown by the call to ioctl */
errno= ioctl_errno;
return -1;
}
}
r= fstat(sv[1], &sbuf);
if (r == -1) {
int fstat_errno;
/* if that failed rollback socket creation */
fstat_errno= errno;
close(sv[0]);
close(sv[1]);
/* return the error thrown by the call to fstat */
errno= fstat_errno;
return -1;
}
dev = sbuf.st_rdev;
/* connect the sockets sv[0] and sv[1] */
r= ioctl(sv[0], NWIOSUDSPAIR, &dev);
if (r == -1) {
int ioctl_errno;
/* if that failed rollback socket creation */
ioctl_errno= errno;
close(sv[0]);
close(sv[1]);
/* return the error thrown by the call to ioctl */
errno= ioctl_errno;
return -1;
}
return 0;
}
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