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/*

 * l4/posix glue for write()

 *

 * Copyright (C) 2007 Bahadir Balban

 */

#include <errno.h>

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>

#include <l4lib/ipcdefs.h>

#include <libposix.h>

static inline int l4_write(int fd, const void *buf, size_t count)

{

        int wrcnt;

        write_mr(L4SYS_ARG0, fd);

        write_mr(L4SYS_ARG1, (const unsigned long)buf);

        write_mr(L4SYS_ARG2, count);

        /* Call pager with write() request. Check ipc error. */

        if ((wrcnt = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_WRITE)) < 0) {

                print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, wrcnt);

                return wrcnt;

        }

        /* Check if syscall itself was successful */

        if ((wrcnt = l4_get_retval()) < 0) {

                print_err("%s: WRITE Error: %d.\n", __FUNCTION__, (int)wrcnt);

                return wrcnt;

        }

        return wrcnt;

}

ssize_t write(int fd, const void *buf, size_t count)

{

        int ret;

        if (!count)

                return 0;

        ret = l4_write(fd, buf, count);

        /* If error, return positive error code */

        if (ret < 0) {

                errno = -ret;

                return -1;

        }

        /* else return value */

        return ret;

}