minix3/lib/libc/sys/sendmsg.c

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2020-02-21 00:59:27 +05:30
#include <sys/cdefs.h>
#include "namespace.h"
#include <errno.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/ioc_net.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#define DEBUG 0
static ssize_t _uds_sendmsg_conn(int sock, const struct msghdr *msg,
int flags);
static ssize_t _uds_sendmsg_dgram(int sock, const struct msghdr *msg,
int flags);
ssize_t sendmsg(int sock, const struct msghdr *msg, int flags)
{
int r;
int uds_sotype;
if (msg == NULL) {
errno= EFAULT;
return -1;
}
r= ioctl(sock, NWIOGUDSSOTYPE, &uds_sotype);
if (r != -1 || errno != ENOTTY) {
if (r == -1) {
return r;
}
if (uds_sotype == SOCK_DGRAM) {
return _uds_sendmsg_dgram(sock, msg, flags);
} else {
return _uds_sendmsg_conn(sock, msg, flags);
}
}
#if DEBUG
fprintf(stderr, "sendmsg: not implemented for fd %d\n", sock);
#endif
errno= ENOSYS;
return -1;
}
static ssize_t _uds_sendmsg_conn(int sock, const struct msghdr *msg,
int flags)
{
struct msg_control msg_ctrl;
int r;
if (flags != 0) {
#if DEBUG
fprintf(stderr, "sendmsg(uds): flags not implemented\n");
#endif
errno= ENOSYS;
return -1;
}
/* grab the control data */
memset(&msg_ctrl, '\0', sizeof(struct msg_control));
if (msg->msg_controllen > MSG_CONTROL_MAX) {
errno = ENOMEM;
return -1;
} else if (msg->msg_controllen > 0) {
memcpy(&msg_ctrl.msg_control, msg->msg_control,
msg->msg_controllen);
}
msg_ctrl.msg_controllen = msg->msg_controllen;
/* send the control data to PFS */
r= ioctl(sock, NWIOSUDSCTRL, (void *) &msg_ctrl);
if (r == -1) {
return r;
}
/* Silently ignore destination, if given. */
return writev(sock, msg->msg_iov, msg->msg_iovlen);
}
static ssize_t _uds_sendmsg_dgram(int sock, const struct msghdr *msg,
int flags)
{
struct msg_control msg_ctrl;
struct sockaddr_un *dest_addr;
int r;
if (flags != 0) {
#if DEBUG
fprintf(stderr, "sendmsg(uds): flags not implemented\n");
#endif
errno= ENOSYS;
return -1;
}
dest_addr = msg->msg_name;
if (dest_addr == NULL) {
errno= EFAULT;
return -1;
}
/* set the target address */
r= ioctl(sock, NWIOSUDSTADDR, (void *) dest_addr);
if (r == -1) {
return r;
}
/* grab the control data */
memset(&msg_ctrl, '\0', sizeof(struct msg_control));
if (msg->msg_controllen > MSG_CONTROL_MAX) {
errno = ENOMEM;
return -1;
} else if (msg->msg_controllen > 0) {
memcpy(&msg_ctrl.msg_control, msg->msg_control,
msg->msg_controllen);
}
msg_ctrl.msg_controllen = msg->msg_controllen;
/* send the control data to PFS */
r= ioctl(sock, NWIOSUDSCTRL, (void *) &msg_ctrl);
if (r == -1) {
return r;
}
/* do the send */
return writev(sock, msg->msg_iov, msg->msg_iovlen);
}