wmii/libixp/transport.c

/*
 * (C)opyright MMIV-MMVI Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>

#include "ixp.h"

#include <cext.h>

unsigned int
ixp_send_message(int fd, void *msg, unsigned int msize, char **errstr)
{
    unsigned int num = 0;
    int r;

    /* send message */
    while(num < msize) {
        r = write(fd, msg + num, msize - num);
        if(r == -1 && errno == EINTR)
            continue;
        if(r < 1) {
            *errstr = "cannot send message";
            return 0;
        }
        num += r;
    }
    return num;
}

static unsigned int
ixp_recv_data(int fd, void *msg, unsigned int msize, char **errstr)
{
    unsigned int num = 0;
    int r = 0;

    /* receive data */
    while(num < msize) {
        r = read(fd, msg + num, msize - num);
        if(r == -1 && errno == EINTR)
            continue;
        if(r < 1) {
            *errstr = "cannot receive data";
            return 0;
        }
        num += r;
    }
    return num;
}

unsigned int
ixp_recv_message(int fd, void *msg, unsigned int msglen, char **errstr)
{
    unsigned int msize;

    /* receive header */
    if(ixp_recv_data(fd, msg, sizeof(unsigned int), errstr) !=
       sizeof(unsigned int))
        return 0;
    ixp_dec_u32(msg, &msize);
    if(msize > msglen) {
        *errstr = "message size exceeds buffer size";
        return 0;
    }
    /* receive message */
    if(ixp_recv_data
       (fd, msg + sizeof(unsigned int), msize - sizeof(unsigned int),
        errstr)
       != msize - sizeof(unsigned int))
        return 0;
    return msize;
}