96 lines
1.7 KiB
C
96 lines
1.7 KiB
C
#undef NDEBUG
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#include <errno.h>
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#include <net/ioctl.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#define DEBUG 0
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static ssize_t _uds_recvmsg_conn(int socket, struct msghdr *msg, int flags);
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static ssize_t _uds_recvmsg_dgram(int socket, struct msghdr *msg, int flags);
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ssize_t recvmsg(int socket, struct msghdr *msg, int flags)
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{
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int r;
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int uds_sotype;
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if (msg == NULL) {
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errno= EFAULT;
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return -1;
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}
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r= ioctl(socket, NWIOGUDSSOTYPE, &uds_sotype);
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if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
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{
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if (r == -1) {
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return r;
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}
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if (uds_sotype == SOCK_DGRAM) {
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return _uds_recvmsg_dgram(socket, msg, flags);
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} else {
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return _uds_recvmsg_conn(socket, msg, flags);
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}
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}
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#if DEBUG
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fprintf(stderr, "recvmsg: not implemented for fd %d\n", socket);
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#endif
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errno= ENOSYS;
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return -1;
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}
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static ssize_t _uds_recvmsg_conn(int socket, struct msghdr *msg, int flags)
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{
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int r;
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if (flags != 0) {
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#if DEBUG
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fprintf(stderr, "recvmsg(uds): flags not implemented\n");
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#endif
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errno= ENOSYS;
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return -1;
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}
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r = readv(socket, msg->msg_iov, msg->msg_iovlen);
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if (r >= 0 && msg->msg_name && msg->msg_namelen > 0)
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{
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getpeername(socket, msg->msg_name, &msg->msg_namelen);
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}
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msg->msg_flags = 0;
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return r;
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}
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static ssize_t _uds_recvmsg_dgram(int socket, struct msghdr *msg, int flags)
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{
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int r;
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if (flags != 0) {
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#if DEBUG
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fprintf(stderr, "recvmsg(uds): flags not implemented\n");
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#endif
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errno= ENOSYS;
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return -1;
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}
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r = readv(socket, msg->msg_iov, msg->msg_iovlen);
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if (r >= 0 && msg->msg_name && msg->msg_namelen > 0)
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{
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ioctl(socket, NWIOGUDSFADDR, msg->msg_name);
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msg->msg_namelen= sizeof(struct sockaddr_un);
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}
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msg->msg_flags = 0;
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return r;
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}
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