mirror of https://github.com/lukechilds/node.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
313 lines
13 KiB
313 lines
13 KiB
/*
|
|
* libeio API header
|
|
*
|
|
* Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann <libeio@schmorp.de>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without modifica-
|
|
* tion, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
|
|
* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
|
|
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
|
|
* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
|
|
* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* the GNU General Public License ("GPL") version 2 or any later version,
|
|
* in which case the provisions of the GPL are applicable instead of
|
|
* the above. If you wish to allow the use of your version of this file
|
|
* only under the terms of the GPL and not to allow others to use your
|
|
* version of this file under the BSD license, indicate your decision
|
|
* by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL. If you do not delete the
|
|
* provisions above, a recipient may use your version of this file under
|
|
* either the BSD or the GPL.
|
|
*/
|
|
|
|
#ifndef EIO_H_
|
|
#define EIO_H_
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#include <stddef.h>
|
|
#include <sys/types.h>
|
|
|
|
typedef struct eio_req eio_req;
|
|
typedef struct eio_dirent eio_dirent;
|
|
|
|
typedef int (*eio_cb)(eio_req *req);
|
|
|
|
#ifndef EIO_REQ_MEMBERS
|
|
# define EIO_REQ_MEMBERS
|
|
#endif
|
|
|
|
#ifndef EIO_STRUCT_STAT
|
|
# define EIO_STRUCT_STAT struct stat
|
|
#endif
|
|
|
|
#ifndef EIO_STRUCT_STATVFS
|
|
# define EIO_STRUCT_STATVFS struct statvfs
|
|
#endif
|
|
|
|
/* for readdir */
|
|
|
|
/* eio_readdir flags */
|
|
enum {
|
|
EIO_READDIR_DENTS = 0x01, /* ptr2 contains eio_dirents, not just the (unsorted) names */
|
|
EIO_READDIR_DIRS_FIRST = 0x02, /* dirents gets sorted into a good stat() ing order to find directories first */
|
|
EIO_READDIR_STAT_ORDER = 0x04, /* dirents gets sorted into a good stat() ing order to quickly stat all files */
|
|
EIO_READDIR_FOUND_UNKNOWN = 0x80, /* set by eio_readdir when *_ARRAY was set and any TYPE=UNKNOWN's were found */
|
|
|
|
EIO_READDIR_CUSTOM1 = 0x100, /* for use by apps */
|
|
EIO_READDIR_CUSTOM2 = 0x200 /* for use by apps */
|
|
};
|
|
|
|
/* using "typical" values in the hope that the compiler will do something sensible */
|
|
enum eio_dtype {
|
|
EIO_DT_UNKNOWN = 0,
|
|
EIO_DT_FIFO = 1,
|
|
EIO_DT_CHR = 2,
|
|
EIO_DT_MPC = 3, /* multiplexed char device (v7+coherent) */
|
|
EIO_DT_DIR = 4,
|
|
EIO_DT_NAM = 5, /* xenix special named file */
|
|
EIO_DT_BLK = 6,
|
|
EIO_DT_MPB = 7, /* multiplexed block device (v7+coherent) */
|
|
EIO_DT_REG = 8,
|
|
EIO_DT_NWK = 9, /* HP-UX network special */
|
|
EIO_DT_CMP = 9, /* VxFS compressed */
|
|
EIO_DT_LNK = 10,
|
|
/* DT_SHAD = 11,*/
|
|
EIO_DT_SOCK = 12,
|
|
EIO_DT_DOOR = 13, /* solaris door */
|
|
EIO_DT_WHT = 14,
|
|
EIO_DT_MAX = 15 /* highest DT_VALUE ever, hopefully */
|
|
};
|
|
|
|
struct eio_dirent {
|
|
int nameofs; /* offset of null-terminated name string in (char *)req->ptr2 */
|
|
unsigned short namelen; /* size of filename without trailing 0 */
|
|
unsigned char type; /* one of EIO_DT_* */
|
|
signed char score; /* internal use */
|
|
ino_t inode; /* the inode number, if available, otherwise unspecified */
|
|
};
|
|
|
|
/* eio_msync flags */
|
|
enum {
|
|
EIO_MS_ASYNC = 1,
|
|
EIO_MS_INVALIDATE = 2,
|
|
EIO_MS_SYNC = 4
|
|
};
|
|
|
|
/* eio_mtouch flags */
|
|
|
|
enum {
|
|
EIO_MT_MODIFY = 1
|
|
};
|
|
|
|
/* eio_sync_file_range flags */
|
|
|
|
enum {
|
|
EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1,
|
|
EIO_SYNC_FILE_RANGE_WRITE = 2,
|
|
EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4
|
|
};
|
|
|
|
typedef double eio_tstamp; /* feel free to use double in your code directly */
|
|
|
|
/* the eio request structure */
|
|
|
|
enum {
|
|
EIO_CUSTOM,
|
|
EIO_OPEN, EIO_CLOSE, EIO_DUP2,
|
|
EIO_READ, EIO_WRITE,
|
|
EIO_READAHEAD, EIO_SENDFILE,
|
|
EIO_STAT, EIO_LSTAT, EIO_FSTAT,
|
|
EIO_STATVFS, EIO_FSTATVFS,
|
|
EIO_TRUNCATE, EIO_FTRUNCATE,
|
|
EIO_UTIME, EIO_FUTIME,
|
|
EIO_CHMOD, EIO_FCHMOD,
|
|
EIO_CHOWN, EIO_FCHOWN,
|
|
EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC,
|
|
EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE,
|
|
EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
|
|
EIO_MKNOD, EIO_READDIR,
|
|
EIO_LINK, EIO_SYMLINK, EIO_READLINK,
|
|
EIO_GROUP, EIO_NOP,
|
|
EIO_BUSY
|
|
};
|
|
|
|
/* eio request structure */
|
|
/* this structure is mostly read-only */
|
|
/* when initialising it, all members must be zero-initialised */
|
|
struct eio_req
|
|
{
|
|
eio_req volatile *next; /* private ETP */
|
|
|
|
ssize_t result; /* result of syscall, e.g. result = read (... */
|
|
off_t offs; /* read, write, truncate, readahead, sync_file_range: file offset */
|
|
size_t size; /* read, write, readahead, sendfile, msync, sync_file_range: length */
|
|
void *ptr1; /* all applicable requests: pathname, old name; readdir: optional eio_dirents */
|
|
void *ptr2; /* all applicable requests: new name or memory buffer; readdir: name strings */
|
|
eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */
|
|
eio_tstamp nv2; /* utime, futime: mtime */
|
|
|
|
int type; /* EIO_xxx constant ETP */
|
|
int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync, readdir: flags */
|
|
long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range: flags */
|
|
long int3; /* chown, fchown: gid; mknod: dev_t */
|
|
int errorno; /* errno value on syscall return */
|
|
|
|
unsigned char flags; /* private */
|
|
signed char pri; /* the priority */
|
|
|
|
void *data;
|
|
eio_cb finish;
|
|
void (*destroy)(eio_req *req); /* called when requets no longer needed */
|
|
void (*feed)(eio_req *req); /* only used for group requests */
|
|
|
|
EIO_REQ_MEMBERS
|
|
|
|
eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */
|
|
};
|
|
|
|
/* _private_ flags */
|
|
enum {
|
|
EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */
|
|
EIO_FLAG_PTR1_FREE = 0x02, /* need to free(ptr1) */
|
|
EIO_FLAG_PTR2_FREE = 0x04, /* need to free(ptr2) */
|
|
EIO_FLAG_GROUPADD = 0x08 /* some request was added to the group */
|
|
};
|
|
|
|
enum {
|
|
EIO_PRI_MIN = -4,
|
|
EIO_PRI_MAX = 4,
|
|
EIO_PRI_DEFAULT = 0,
|
|
};
|
|
|
|
/* returns < 0 on error, errno set
|
|
* need_poll, if non-zero, will be called when results are available
|
|
* and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself).
|
|
* done_poll is called when the need to poll is gone.
|
|
*/
|
|
int eio_init (void (*want_poll)(void), void (*done_poll)(void));
|
|
|
|
/* must be called regularly to handle pending requests */
|
|
/* returns 0 if all requests were handled, -1 if not, or the value of EIO_FINISH if != 0 */
|
|
int eio_poll (void);
|
|
|
|
/* stop polling if poll took longer than duration seconds */
|
|
void eio_set_max_poll_time (eio_tstamp nseconds);
|
|
/* do not handle more then count requests in one call to eio_poll_cb */
|
|
void eio_set_max_poll_reqs (unsigned int nreqs);
|
|
|
|
/* set minimum required number
|
|
* maximum wanted number
|
|
* or maximum idle number of threads */
|
|
void eio_set_min_parallel (unsigned int nthreads);
|
|
void eio_set_max_parallel (unsigned int nthreads);
|
|
void eio_set_max_idle (unsigned int nthreads);
|
|
|
|
unsigned int eio_nreqs (void); /* number of requests in-flight */
|
|
unsigned int eio_nready (void); /* number of not-yet handled requests */
|
|
unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */
|
|
unsigned int eio_nthreads (void); /* number of worker threads in use currently */
|
|
|
|
/*****************************************************************************/
|
|
/* convinience wrappers */
|
|
|
|
#ifndef EIO_NO_WRAPPERS
|
|
eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */
|
|
eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */
|
|
eio_req *eio_sync (int pri, eio_cb cb, void *data);
|
|
eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_close (int fd, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
|
|
eio_req *eio_fstatvfs (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
|
|
eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_open (const char *path, int flags, mode_t mode, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_readdir (const char *path, int flags, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
|
|
eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
|
|
eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
|
|
eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
|
|
eio_req *eio_statvfs (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
|
|
eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
|
|
eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data);
|
|
#endif
|
|
|
|
/*****************************************************************************/
|
|
/* groups */
|
|
|
|
eio_req *eio_grp (eio_cb cb, void *data);
|
|
void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit);
|
|
void eio_grp_limit (eio_req *grp, int limit);
|
|
void eio_grp_add (eio_req *grp, eio_req *req);
|
|
void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */
|
|
|
|
/*****************************************************************************/
|
|
/* request api */
|
|
|
|
/* true if the request was cancelled, useful in the invoke callback */
|
|
#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED)
|
|
|
|
#define EIO_RESULT(req) ((req)->result)
|
|
/* returns a pointer to the result buffer allocated by eio */
|
|
#define EIO_BUF(req) ((req)->ptr2)
|
|
#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req))
|
|
#define EIO_STATVFS_BUF(req) ((EIO_STRUCT_STATVFS *)EIO_BUF(req))
|
|
#define EIO_PATH(req) ((char *)(req)->ptr1)
|
|
|
|
/* submit a request for execution */
|
|
void eio_submit (eio_req *req);
|
|
/* cancel a request as soon fast as possible, if possible */
|
|
void eio_cancel (eio_req *req);
|
|
/* destroy a request that has never been submitted */
|
|
void eio_destroy (eio_req *req);
|
|
|
|
/*****************************************************************************/
|
|
/* convinience functions */
|
|
|
|
ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|
|
|
|
|