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[/] [ao486/] [trunk/] [syn/] [components/] [ps2/] [software/] [exe_bsp/] [HAL/] [src/] [alt_fcntl.c] - Rev 2
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/****************************************************************************** * * * License Agreement * * * * Copyright (c) 2004 Altera Corporation, San Jose, California, USA. * * All rights reserved. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the "Software"), * * to deal in the Software without restriction, including without limitation * * the rights to use, copy, modify, merge, publish, distribute, sublicense, * * and/or sell copies of the Software, and to permit persons to whom the * * Software is furnished to do so, subject to the following conditions: * * * * The above copyright notice and this permission notice shall be included in * * all copies or substantial portions of the Software. * * * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * * DEALINGS IN THE SOFTWARE. * * * * This agreement shall be governed in all respects by the laws of the State * * of California and by the laws of the United States of America. * * * * Altera does not recommend, suggest or require that this reference design * * file be used in conjunction or combination with any other product. * ******************************************************************************/ #include <unistd.h> #include <fcntl.h> #include <stdio.h> #include <stdarg.h> #include "sys/alt_errno.h" #include "priv/alt_file.h" #include "alt_types.h" #include "os/alt_syscall.h" #define ALT_FCNTL_FLAGS_MASK ((alt_u32) (O_APPEND | O_NONBLOCK)) /* * fcntl() is a limited implementation of the standard fcntl() system call. * It can be used to change the state of the flags associated with an open * file descriptor. Normally these flags are set during the call to * open(). It is anticipated that the main use of this function will be to * change the state of a device from blocking to non-blocking (where this is * supported). * * The input argument "fd" is the file descriptor to be manipulated. "cmd" * is the command to execute. This can be either F_GETFL (return the * current value of the flags) or F_SETFL (set the value of the flags). * * If "cmd" is F_SETFL then the argument "arg" is the new value of flags, * otherwise "arg" is ignored. Only the flags: O_APPEND and O_NONBLOCK * can be updated by a call to fcntl(). All other flags remain * unchanged. * * ALT_FCNTL is mapped onto the fcntl() system call in alt_syscall.h */ int ALT_FCNTL (int file, int cmd, ...) { alt_fd* fd; long flags; va_list argp; /* * A common error case is that when the file descriptor was created, the call * to open() failed resulting in a negative file descriptor. This is trapped * below so that we don't try and process an invalid file descriptor. */ fd = (file < 0) ? NULL : &alt_fd_list[file]; if (fd) { switch (cmd) { case F_GETFL: return fd->fd_flags & ~((alt_u32) ALT_FD_FLAGS_MASK); case F_SETFL: va_start(argp, cmd); flags = va_arg(argp, long); fd->fd_flags &= ~ALT_FCNTL_FLAGS_MASK; fd->fd_flags |= (flags & ALT_FCNTL_FLAGS_MASK); va_end(argp); return 0; default: ALT_ERRNO = EINVAL; return -1; } } ALT_ERRNO = EBADFD; return -1; }