152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
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// Projectname: SWEB
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// Simple operating system for educational purposes
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//
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// Copyright (C) 2005 Andreas Niederl
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#pragma once
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#include "unistd.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* The basic flags for files
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*/
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#ifndef O_RDONLY
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#define O_RDONLY 0x0001
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#endif
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#ifndef O_WRONLY
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#define O_WRONLY 0x0002
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#endif
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#ifndef O_RDWR
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#define O_RDWR 0x0004
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#endif
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#ifndef O_CREAT
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#define O_CREAT 0x0008
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#endif
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#ifndef O_APPEND
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#define O_APPEND 0x0010
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#endif
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#ifndef O_EXCL
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#define O_EXCL 0x0020
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#endif
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#ifndef O_NONBLOCK
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#define O_NONBLOCK 0x0040
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#endif
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#ifndef O_TRUNC
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#define O_TRUNC 0x0080
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#endif
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#ifndef O_SYNC
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#define O_SYNC 0x0100
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#endif
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#ifndef O_DSYNC
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#define O_DSYNC 0x0200
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#endif
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#ifndef O_RSYNC
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#define O_RSYNC O_SYNC
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#endif
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/**
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* The basic access modes for files
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*/
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#define A_READABLE 0x0001
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#define A_WRITABLE 0x0002
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#define A_EXECABLE 0x0004
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/**
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* Structure for describing a file lock
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*
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*/
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struct flock
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{
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/**
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* Type of lock
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* F_RDLCK, F_WRLCK or F_UNLCK
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*
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*/
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short l_type;
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/**
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* Flag for starting offset
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*
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*/
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short l_whence;
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/**
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* Relative offset in bytes
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*
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*/
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off_t l_start;
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/**
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* Size, if 0 then until EOF
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*
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*/
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off_t l_len;
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/**
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* Process ID of the process holding the lock.
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*
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*/
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pid_t l_pid;
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};
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/**
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* Equivalent to open() with flags equal to O_CREAT | O_WRONLY | O_TRUNC.
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*
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* @param path A pathname pointing to the file to open
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* @param mode
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* @return A valid file descriptor or -1 if an error occured
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*
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*/
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extern int creat(const char *path, mode_t mode);
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/**
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* Converts a pathname into a file descriptor which can be used in subsequent
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* read and write operations.
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* If successfull, the lowest file descriptor not currently open for the
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* process will be returned.
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*
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* Possible values for the flags parameter are:
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* - O_RDONLY Open for reading only
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* - O_WRONLY Open for writing only
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* - O_RDWR Open for reading and writing
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*
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* which can be bitwise combined (or'd) with:
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* - O_APPEND Open in append mode
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* - O_CREAT Create file if it does not exist
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* - O_TRUNC Truncate file to 0 length if it already exists and is a
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* regular file
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*
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* @param path A pathname pointing to the file to open
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* @param flags Flags to specify how the file is opened
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* @return A valid file descriptor or -1 if an error occured
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*
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*/
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extern int open(const char *path, int flags, ...);
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#ifdef __cplusplus
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}
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#endif
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