138 lines
4.7 KiB
C
138 lines
4.7 KiB
C
#ifndef _SYS_FCNTL_H_
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#define _SYS_FCNTL_H_
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/*
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* This file includes the definitions for open and fcntl
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* described by POSIX for <fcntl.h>.
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*/
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#include <sys/featuretest.h>
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#include <sys/types.h>
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#if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
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#include <sys/stat.h>
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#endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
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/*
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* File status flags: these are used by open(2), fcntl(2).
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* They are also used (indirectly) in the kernel file structure f_flags,
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* which is a superset of the open/fcntl flags. Open flags and f_flags
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* are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
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* Open/fcntl flags begin with O_; kernel-internal flags begin with F.
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*/
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/* open-only flags */
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#define O_RDONLY 0x00000000 /* open for reading only */
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#define O_WRONLY 0x00000001 /* open for writing only */
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#define O_RDWR 0x00000002 /* open for reading and writing */
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#define O_ACCMODE 0x00000003 /* mask for above modes */
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/* File status flags for open() and fcntl(). POSIX Table 6-5. */
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#define O_APPEND 02000 /* set append mode */
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#define O_NONBLOCK 04000 /* no delay */
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#define O_REOPEN 010000 /* automatically re-open device after driver
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* restart
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*/
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#ifndef __minix /* NOT SUPPORTED! */
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#if defined(_NETBSD_SOURCE)
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#define O_SHLOCK 0x00000010 /* open with shared file lock */
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#define O_EXLOCK 0x00000020 /* open with exclusive file lock */
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#define O_ASYNC 0x00000040 /* signal pgrp when data ready */
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#endif
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#if (_POSIX_C_SOURCE - 0) >= 199309L || \
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(defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) || \
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(_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
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#define O_SYNC 0x00000080 /* synchronous writes */
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#endif
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#if defined(_NETBSD_SOURCE)
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#define O_NOFOLLOW 0x00000100 /* don't follow symlinks on the last */
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/* path component */
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#endif
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#endif /* !__minix */
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/* Oflag values for open(). POSIX Table 6-4. */
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#define O_CREAT 00100 /* creat file if it doesn't exist */
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#define O_EXCL 00200 /* exclusive use flag */
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#define O_NOCTTY 00400 /* do not assign a controlling terminal */
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#define O_TRUNC 01000 /* truncate flag */
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#ifndef __minix /* NOT SUPPORTED! */
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#if (_POSIX_C_SOURCE - 0) >= 199309L || (_XOPEN_SOURCE - 0) >= 500 || \
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defined(_NETBSD_SOURCE)
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#define O_DSYNC 0x00010000 /* write: I/O data completion */
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#define O_RSYNC 0x00020000 /* read: I/O completion as for write */
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#endif
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#if defined(_NETBSD_SOURCE)
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#define O_ALT_IO 0x00040000 /* use alternate i/o semantics */
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#define O_DIRECT 0x00080000 /* direct I/O hint */
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#endif
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#endif /* !__minix */
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/*
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* Constants used for fcntl(2)
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*/
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/* command values */
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/* These values are used for cmd in fcntl(). POSIX Table 6-1. */
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#define F_DUPFD 0 /* duplicate file descriptor */
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#define F_GETFD 1 /* get file descriptor flags */
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#define F_SETFD 2 /* set file descriptor flags */
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#define F_GETFL 3 /* get file status flags */
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#define F_SETFL 4 /* set file status flags */
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#define F_GETLK 5 /* get record locking information */
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#define F_SETLK 6 /* set record locking information */
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#define F_SETLKW 7 /* set record locking info; wait if blocked */
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#define F_FREESP 8 /* free a section of a regular file */
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/* File descriptor flags used for fcntl(). POSIX Table 6-2. */
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#define FD_CLOEXEC 1 /* close on exec flag for third arg of fcntl */
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/* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
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#define F_RDLCK 1 /* shared or read lock */
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#define F_WRLCK 2 /* exclusive or write lock */
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#define F_UNLCK 3 /* unlock */
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/*
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* Advisory file segment locking data type -
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* information passed to system by user
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*/
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struct flock {
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short l_type; /* type: F_RDLCK, F_WRLCK, or F_UNLCK */
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short l_whence; /* flag for starting offset */
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off_t l_start; /* relative offset in bytes */
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off_t l_len; /* size; if 0, then until EOF */
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pid_t l_pid; /* process id of the locks' owner */
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};
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#if defined(_NETBSD_SOURCE)
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/* lock operations for flock(2) */
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#define LOCK_SH F_RDLCK /* Shared lock */
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#define LOCK_EX F_WRLCK /* Exclusive lock */
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#define LOCK_NB 0x0080 /* Do not block when locking */
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#define LOCK_UN F_UNLCK /* Unlock */
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#endif
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/* Always ensure that these are consistent with <stdio.h> and <unistd.h>! */
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#ifndef SEEK_SET
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#define SEEK_SET 0 /* set file offset to offset */
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#endif
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#ifndef SEEK_CUR
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#define SEEK_CUR 1 /* set file offset to current plus offset */
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#endif
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#ifndef SEEK_END
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#define SEEK_END 2 /* set file offset to EOF plus offset */
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#endif
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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int open(const char *, int, ...);
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int creat(const char *, mode_t);
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int fcntl(int, int, ...);
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#if defined(_NETBSD_SOURCE)
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int flock(int, int);
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#endif /* _NETBSD_SOURCE */
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__END_DECLS
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#endif /* !_SYS_FCNTL_H_ */
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