cleanup locking

[unix-history] / usr / src / sys / sys / file.h

/*      file.h  4.17    83/06/09        */

#ifdef KERNEL
/*
* Descriptor table entry.
* One for each kernel object.
*/
struct  file {
       short   f_flag;         /* see below */
       short   f_type;         /* descriptor type */
       short   f_count;        /* reference count */
       short   f_msgcount;     /* references from message queue */
       struct  fileops {
               int     (*fo_rw)();
               int     (*fo_ioctl)();
               int     (*fo_select)();
               int     (*fo_stat)();
               int     (*fo_close)();
       } *f_ops;
       caddr_t f_data;         /* inode */
       off_t   f_offset;
};

struct  file *file, *fileNFILE;
int     nfile;
struct  file *getf();
struct  file *falloc();

/* flags */
#define FOPEN           (-1)
#define FREAD           00001           /* descriptor read/receive'able */
#define FWRITE          00002           /* descriptor write/send'able */
#define FNDELAY         00004           /* no delay */
#define FAPPEND         00010           /* append on each write */
#define FMARK           00020           /* mark during gc() */
#define FDEFER          00040           /* defer for next gc pass */
#define FASYNC          00100           /* signal pgrp when data ready */

/* bits to save after open */
#define FMASK           00117   
#define FCNTLCANT       (FREAD|FWRITE|FMARK|FDEFER)
#endif

/* open only modes */
#define FCREAT          01000           /* create if nonexistant */
#define FTRUNC          02000           /* truncate to zero length */
#define FEXCL           04000           /* error if already created */

/*
* User definitions.
*/

/*
* Open call.
*/
#define O_RDONLY        000             /* open for reading */
#define O_WRONLY        001             /* open for writing */
#define O_RDWR          002             /* open for read & write */
#define O_NDELAY        004             /* non-blocking open */
#define O_APPEND        010             /* append on each write */
#define O_CREAT         FCREAT          /* open with file create */
#define O_TRUNC         FTRUNC          /* open with truncation */
#define O_EXCL          FEXCL           /* error on create if file exists */

/*
* Flock call.
*/
#define LOCK_SH         1       /* shared lock */
#define LOCK_EX         2       /* exclusive lock */
#define LOCK_NB         4       /* don't block when locking */
#define LOCK_UN         8       /* unlock */

/*
* Access call.
*/
#define F_OK            0       /* does file exist */
#define X_OK            1       /* is it executable by caller */
#define W_OK            2       /* writable by caller */
#define R_OK            4       /* readable by caller */

/*
* Lseek call.
*/
#define L_SET           0       /* absolute offset */
#define L_INCR          1       /* relative to current offset */
#define L_XTND          2       /* relative to end of file */

#ifdef KERNEL
#define GETF(fp, fd) { \
       if ((unsigned)(fd) >= NOFILE || ((fp) = u.u_ofile[fd]) == NULL) { \
               u.u_error = EBADF; \
               return; \
       } \
}
#define DTYPE_INODE     1       /* file */
#define DTYPE_SOCKET    2       /* communications endpoint */
#endif