include/sys/fcntl.h

   1 #ifndef _SYS_FCNTL_H_
   2 #define _SYS_FCNTL_H_
   3
   4 /*
   5  * This file includes the definitions for open and fcntl
   6  * described by POSIX for <fcntl.h>.
   7  */
   8 #include <sys/featuretest.h>
   9 #include <sys/types.h>
  10 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
  11 #include <sys/stat.h>
  12 #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
  13
  14 /*
  15  * File status flags: these are used by open(2), fcntl(2).
  16  * They are also used (indirectly) in the kernel file structure f_flags,
  17  * which is a superset of the open/fcntl flags.  Open flags and f_flags
  18  * are inter-convertible using OFLAGS(fflags) and FFLAGS(oflags).
  19  * Open/fcntl flags begin with O_; kernel-internal flags begin with F.
  20  */
  21 /* open-only flags */
  22 #define O_RDONLY        0x00000000      /* open for reading only */
  23 #define O_WRONLY        0x00000001      /* open for writing only */
  24 #define O_RDWR          0x00000002      /* open for reading and writing */
  25 #define O_ACCMODE       0x00000003      /* mask for above modes */
  26
  27 /* File status flags for open() and fcntl().  POSIX Table 6-5. */
  28 #define O_APPEND       02000    /* set append mode */
  29 #define O_NONBLOCK     04000    /* no delay */
  30 #define O_REOPEN      010000    /* automatically re-open device after driver
  31                                  * restart
  32                                  */
  33
  34
  35 #ifndef __minix  /* NOT SUPPORTED! */
  36 #if defined(_NETBSD_SOURCE)
  37 #define O_SHLOCK        0x00000010      /* open with shared file lock */
  38 #define O_EXLOCK        0x00000020      /* open with exclusive file lock */
  39 #define O_ASYNC         0x00000040      /* signal pgrp when data ready */
  40 #endif
  41 #if (_POSIX_C_SOURCE - 0) >= 199309L || \
  42     (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) || \
  43     (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
  44 #define O_SYNC          0x00000080      /* synchronous writes */
  45 #endif
  46 #if defined(_NETBSD_SOURCE)
  47 #define O_NOFOLLOW      0x00000100      /* don't follow symlinks on the last */
  48                                         /* path component */
  49 #endif
  50 #endif /* !__minix */
  51
  52 /* Oflag values for open().  POSIX Table 6-4. */
  53 #define O_CREAT        00100    /* creat file if it doesn't exist */
  54 #define O_EXCL         00200    /* exclusive use flag */
  55 #define O_NOCTTY       00400    /* do not assign a controlling terminal */
  56 #define O_TRUNC        01000    /* truncate flag */
  57
  58 #ifndef __minix /* NOT SUPPORTED! */
  59 #if (_POSIX_C_SOURCE - 0) >= 199309L || (_XOPEN_SOURCE - 0) >= 500 || \
  60     defined(_NETBSD_SOURCE)
  61 #define O_DSYNC         0x00010000      /* write: I/O data completion */
  62 #define O_RSYNC         0x00020000      /* read: I/O completion as for write */
  63 #endif
  64
  65 #if defined(_NETBSD_SOURCE)
  66 #define O_ALT_IO        0x00040000      /* use alternate i/o semantics */
  67 #define O_DIRECT        0x00080000      /* direct I/O hint */
  68 #endif
  69 #endif /* !__minix */
  70
  71 /*
  72  * Constants used for fcntl(2)
  73  */
  74
  75 /* command values */
  76 /* These values are used for cmd in fcntl().  POSIX Table 6-1.  */
  77 #define F_DUPFD            0    /* duplicate file descriptor */
  78 #define F_GETFD            1    /* get file descriptor flags */
  79 #define F_SETFD            2    /* set file descriptor flags */
  80 #define F_GETFL            3    /* get file status flags */
  81 #define F_SETFL            4    /* set file status flags */
  82 #define F_GETLK            5    /* get record locking information */
  83 #define F_SETLK            6    /* set record locking information */
  84 #define F_SETLKW           7    /* set record locking info; wait if blocked */
  85 #define F_FREESP           8    /* free a section of a regular file */
  86
  87 /* File descriptor flags used for fcntl().  POSIX Table 6-2. */
  88 #define FD_CLOEXEC         1    /* close on exec flag for third arg of fcntl */
  89
  90 /* record locking flags (F_GETLK, F_SETLK, F_SETLKW) */
  91 #define F_RDLCK            1    /* shared or read lock */
  92 #define F_WRLCK            2    /* exclusive or write lock */
  93 #define F_UNLCK            3    /* unlock */
  94
  95 /*
  96  * Advisory file segment locking data type -
  97  * information passed to system by user
  98  */
  99 struct flock {
 100   short l_type;                 /* type: F_RDLCK, F_WRLCK, or F_UNLCK */
 101   short l_whence;               /* flag for starting offset */
 102   off_t l_start;                /* relative offset in bytes */
 103   off_t l_len;                  /* size; if 0, then until EOF */
 104   pid_t l_pid;                  /* process id of the locks' owner */
 105 };
 106
 107 #if defined(_NETBSD_SOURCE)
 108 /* lock operations for flock(2) */
 109 #define LOCK_SH         F_RDLCK         /* Shared lock */
 110 #define LOCK_EX         F_WRLCK         /* Exclusive lock */
 111 #define LOCK_NB         0x0080          /* Do not block when locking */
 112 #define LOCK_UN         F_UNLCK         /* Unlock */
 113 #endif
 114
 115 /* Always ensure that these are consistent with <stdio.h> and <unistd.h>! */
 116 #ifndef SEEK_SET
 117 #define SEEK_SET        0       /* set file offset to offset */
 118 #endif
 119 #ifndef SEEK_CUR
 120 #define SEEK_CUR        1       /* set file offset to current plus offset */
 121 #endif
 122 #ifndef SEEK_END
 123 #define SEEK_END        2       /* set file offset to EOF plus offset */
 124 #endif
 125
 126 #include <sys/cdefs.h>
 127
 128 __BEGIN_DECLS
 129 int     open(const char *, int, ...);
 130 int     creat(const char *, mode_t);
 131 int     fcntl(int, int, ...);
 132 #if defined(_NETBSD_SOURCE)
 133 int     flock(int, int);
 134 #endif /* _NETBSD_SOURCE */
 135 __END_DECLS
 136
 137 #endif /* !_SYS_FCNTL_H_ */