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111 lines
3.7 KiB
C
111 lines
3.7 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2012, 2013, 2014.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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sortix/fcntl.h
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Declares various constants related to opening files.
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*******************************************************************************/
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#ifndef INCLUDE_SORTIX_FCNTL_H
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#define INCLUDE_SORTIX_FCNTL_H
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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// Remember to update the flag classifications at the top of descriptor.cpp if
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// you add new flags here.
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#define O_READ (1<<0)
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#define O_WRITE (1<<1)
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#define O_EXEC (1<<2)
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#define O_APPEND (1<<3)
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#define O_CLOEXEC (1<<4)
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#define O_CREATE (1<<5)
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#define O_DIRECTORY (1<<6)
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#define O_EXCL (1<<7)
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#define O_TRUNC (1<<8)
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#define O_CLOFORK (1<<9)
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#define O_SEARCH (1<<10)
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#define O_NONBLOCK (1<<11)
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#define O_NOFOLLOW (1<<12)
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#define O_SYMLINK_NOFOLLOW (1<<13)
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#define O_NOCTTY (1<<14)
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#define O_TTY_INIT (1<<15)
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#define O_ACCMODE (O_READ | O_WRITE | O_EXEC | O_SEARCH)
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#define FD_CLOEXEC (1<<0)
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#define FD_CLOFORK (1<<1)
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#define __FD_ALLOWED_FLAGS (FD_CLOEXEC | FD_CLOFORK)
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/* Encode type information about arguments into fcntl commands. Unfortunately
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the fcntl function declaration doesn't include type information, which means
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that the fcntl implementation either needs a list of command type information
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to use va_list correctly - or we can simply embed the information into the
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commands. */
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#define F_TYPE_EXP 3 /* 2^3 kinds of argument types supported.*/
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#define F_TYPE_VOID 0
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#define F_TYPE_INT 1
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#define F_TYPE_LONG 2
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#define F_TYPE_PTR 3
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/* 5-7 is unused in case of future expansion. */
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#define F_ENCODE_CMD(cmd_val, arg_type) ((cmd_val) << F_TYPE_EXP | (arg_type))
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#define F_DECODE_CMD_RAW(cmd) (cmd >> F_TYPE_EXP)
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#define F_DECODE_CMD_TYPE(cmd) ((cmd) & ((1 << F_TYPE_EXP)-1))
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/* Encode small parameters into fcntl commands. This allows adding some flags
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and other modifiers to fcntl commands without declaring a heap of new fcntl
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commands variants. */
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#define F_ENCODE(cmd, small_param) (((cmd) & 0xFFFF) | ((small_param) << 16))
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#define F_DECODE_CMD(val) (val & 0xFFFF)
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#define F_DECODE_FLAGS(val) ((val & ~0xFFFF) >> 16)
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/* Set file descriptor status. */
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#define F_SETFD_NUM 0
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#define F_SETFD F_ENCODE_CMD(F_SETFD_NUM, F_TYPE_INT)
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/* Get file descriptor status. */
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#define F_GETFD_NUM 1
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#define F_GETFD F_ENCODE_CMD(F_GETFD_NUM, F_TYPE_VOID)
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/* Set descriptor table entry flags. */
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#define F_SETFL_NUM 3
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#define F_SETFL F_ENCODE_CMD(F_SETFL_NUM, F_TYPE_INT)
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/* Get descriptor table entry flags. */
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#define F_GETFL_NUM 3
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#define F_GETFL F_ENCODE_CMD(F_GETFL_NUM, F_TYPE_VOID)
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/* Duplicates the file descriptor with at least the given index. */
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#define F_DUPFD_NUM 4
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#define F_DUPFD F_ENCODE_CMD(F_ENCODE(F_DUPFD_NUM, 0), F_TYPE_INT)
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#define F_DUPFD_CLOEXEC F_ENCODE_CMD(F_ENCODE(F_DUPFD_NUM, FD_CLOEXEC), F_TYPE_INT)
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#define F_DUPFD_CLOFORK F_ENCODE_CMD(F_ENCODE(F_DUPFD_NUM, FD_CLOFORK), F_TYPE_INT)
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#define AT_FDCWD (-100)
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#define AT_REMOVEDIR (1<<0)
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#define AT_EACCESS (1<<1)
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#define AT_SYMLINK_NOFOLLOW (1<<2)
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#define AT_REMOVEFILE (1<<3)
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#define AT_SYMLINK_FOLLOW (1<<4)
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__END_DECLS
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#endif
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