135 lines
2.5 KiB
C
135 lines
2.5 KiB
C
#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <net/ioctl.h>
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#include <net/netlib.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#define DEBUG 0
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static int _uds_socketpair(int type, int protocol, int sv[2]);
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/*
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* Create a pair of connected sockets
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*/
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int socketpair(int domain, int type, int protocol, int sv[2]) {
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#if DEBUG
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fprintf(stderr, "socketpair: domain %d, type %d, protocol %d\n",
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domain, type, protocol);
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#endif
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if (domain != AF_UNIX)
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{
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errno = EAFNOSUPPORT;
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return -1;
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}
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if (domain == AF_UNIX &&
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(type == SOCK_STREAM || type == SOCK_SEQPACKET))
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return _uds_socketpair(type, protocol, sv);
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#if DEBUG
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fprintf(stderr,
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"socketpair: nothing for domain %d, type %d, protocol %d\n",
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domain, type, protocol);
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#endif
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errno= EPROTOTYPE;
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return -1;
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}
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static int _uds_socketpair(int type, int protocol, int sv[2])
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{
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dev_t dev;
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int r, i;
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struct stat sbuf;
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if (protocol != 0)
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{
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#if DEBUG
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fprintf(stderr, "socketpair(uds): bad protocol %d\n", protocol);
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#endif
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errno= EPROTONOSUPPORT;
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return -1;
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}
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/* in this 'for' loop two unconnected sockets are created */
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for (i = 0; i < 2; i++) {
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sv[i]= open(UDS_DEVICE, O_RDWR);
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if (sv[i] == -1) {
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int open_errno = errno;
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if (i == 1) {
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/* if we failed to open() the 2nd
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* socket, we need to close the 1st
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*/
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close(sv[0]);
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errno = open_errno;
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}
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return -1;
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}
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/* set the type for the socket via ioctl
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* (SOCK_STREAM, SOCK_SEQPACKET, etc)
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*/
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r= ioctl(sv[i], NWIOSUDSTYPE, &type);
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if (r == -1) {
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int ioctl_errno;
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/* if that failed rollback socket creation */
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ioctl_errno= errno;
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close(sv[i]);
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if (i == 1) {
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/* if we just closed the 2nd socket, we
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* need to close the 1st
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*/
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close(sv[0]);
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}
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/* return the error thrown by the call to ioctl */
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errno= ioctl_errno;
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return -1;
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}
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}
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r= fstat(sv[1], &sbuf);
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if (r == -1) {
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int fstat_errno;
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/* if that failed rollback socket creation */
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fstat_errno= errno;
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close(sv[0]);
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close(sv[1]);
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/* return the error thrown by the call to fstat */
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errno= fstat_errno;
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return -1;
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}
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dev = sbuf.st_dev;
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/* connect the sockets sv[0] and sv[1] */
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r= ioctl(sv[0], NWIOSUDSPAIR, &dev);
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if (r == -1) {
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int ioctl_errno;
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/* if that failed rollback socket creation */
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ioctl_errno= errno;
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close(sv[0]);
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close(sv[1]);
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/* return the error thrown by the call to ioctl */
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errno= ioctl_errno;
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return -1;
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}
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return 0;
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}
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