sys/sys5/write.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1999 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "../common/compat.h"
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

/*
 * If writing to a utmp-like file, map the utmp structure to
 * new format on the fly.
 */
extern int conv2utmpx(char *, char *, int);

int
write(int fd, char *buf, int size)
{
    return (bc_write(fd, buf, size));
}

int
bc_write(int fd, char *buf, int size)
{
    int ret, off;
    int nsize;
    char *nbuf;

    if (fd_get(fd) != -1) {
        nsize = getmodsize(size, sizeof (struct compat_utmp),
            sizeof (struct utmpx));

        if ((nbuf = (void *)malloc(nsize)) == NULL) {
            (void) fprintf(stderr, "write: malloc failed\n");
            exit(-1);
        }

        (void) memset(nbuf, 0, nsize);

        ret = conv2utmpx(nbuf, buf, size);

        if ((ret = _write(fd, nbuf, ret)) == -1) {
            free(nbuf);
            return (-1);
        }

        free(nbuf);

        ret = getmodsize(ret, sizeof (struct utmpx),
            sizeof (struct compat_utmp));
        return (ret);
    }

    return (_write(fd, buf, size));
}

/* From SunOS/SVR4 utmp.h */
#define USER_PROCESS 7
#define DEAD_PROCESS 8

extern int
conv2utmpx(char *nbuf, char *buf, int len)
{
    struct compat_utmp *ut;
    struct utmpx *utx;

    utx = (struct utmpx *) nbuf;
    ut  = (struct compat_utmp  *) buf;

    while ((char *)ut < (buf + len)) {
                (void) strcpy(utx->ut_user, ut->ut_name);
        (void) memset(utx->ut_id, 0, sizeof (utx->ut_id));
        (void) strcpy(utx->ut_line, ut->ut_line);
        utx->ut_pid = 0;
        if ((strcmp(utx->ut_user, "") == 0) &&
            (strcmp(utx->ut_host, "") == 0))
            utx->ut_type = DEAD_PROCESS;
        else
            utx->ut_type = USER_PROCESS;
        utx->ut_exit.e_termination = 0;
        utx->ut_exit.e_exit = 0;
        utx->ut_tv.tv_sec = ut->ut_time;
        utx->ut_tv.tv_usec = 0;
        utx->ut_session = 0;
        utx->ut_syslen = sizeof (ut->ut_name) + 1;
        (void) strcpy(utx->ut_host, ut->ut_host);
        ut++;
        utx++;
    }
    return ((char *) utx - nbuf);
}