posix_unistd.c
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/*
* Copyright (C) 2017 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @{
*
* @file
* @brief Implements various POSIX syscalls
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#include <errno.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef MODULE_VFS
#include "vfs.h"
#elif defined(MODULE_UART_STDIO)
#include "uart_stdio.h"
#endif
int close(int fd)
{
#ifdef MODULE_VFS
int res = vfs_close(fd);
if (res < 0) {
errno = -res;
return -1;
}
return res;
#else
(void)fd;
errno = ENODEV;
return -1;
#endif
}
off_t lseek(int fd, off_t off, int whence)
{
#ifdef MODULE_VFS
off_t res = vfs_lseek(fd, off, whence);
if (res < 0) {
errno = -res;
return -1;
}
return res;
#else
(void)fd;
(void)off;
(void)whence;
errno = ENODEV;
return -1;
#endif
}
int fcntl(int fd, int cmd, int arg)
{
#ifdef MODULE_VFS
int res = vfs_fcntl(fd, cmd, arg);
if (res < 0) {
errno = -res;
return -1;
}
return res;
#else
(void)fd;
(void)cmd;
(void)arg;
errno = ENODEV;
return -1;
#endif
}
int fstat(int fd, struct stat *buf)
{
#ifdef MODULE_VFS
int res = vfs_fstat(fd, buf);
if (res < 0) {
errno = -res;
return -1;
}
return res;
#else
(void)fd;
(void)buf;
errno = ENODEV;
return -1;
#endif
}
ssize_t read(int fd, void *dest, size_t count)
{
#ifdef MODULE_VFS
ssize_t res = vfs_read(fd, dest, count);
if (res < 0) {
errno = -res;
return -1;
}
return res;
#elif defined(MODULE_UART_STDIO)
if (fd == 0) {
return uart_stdio_read(dest, count);
}
errno = EBADF;
return -1;
#else
(void)fd;
(void)dest;
(void)count;
errno = ENODEV;
return -1;
#endif
}
ssize_t write(int fd, const void *src, size_t count)
{
#ifdef MODULE_VFS
ssize_t res = vfs_write(fd, src, count);
if (res < 0) {
errno = -res;
return -1;
}
return res;
#elif defined(MODULE_UART_STDIO)
if (fd == 0) {
return uart_stdio_write(src, count);
}
errno = EBADF;
return -1;
#else
(void)fd;
(void)src;
(void)count;
errno = ENODEV;
return -1;
#endif
}
/** @} */