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