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/* |
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* libeio API header |
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* |
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* Copyright (c) 2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann <libeio@schmorp.de> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without modifica- |
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* tion, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* Alternatively, the contents of this file may be used under the terms of |
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* the GNU General Public License ("GPL") version 2 or any later version, |
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* in which case the provisions of the GPL are applicable instead of |
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* the above. If you wish to allow the use of your version of this file |
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* only under the terms of the GPL and not to allow others to use your |
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* version of this file under the BSD license, indicate your decision |
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* by deleting the provisions above and replace them with the notice |
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* and other provisions required by the GPL. If you do not delete the |
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* provisions above, a recipient may use your version of this file under |
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* either the BSD or the GPL. |
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*/ |
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|
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#ifndef EIO_H_ |
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#define EIO_H_ |
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|
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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|
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#include <stddef.h> |
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#include <signal.h> |
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#include <sys/types.h> |
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|
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typedef struct eio_req eio_req; |
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typedef struct eio_dirent eio_dirent; |
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|
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typedef int (*eio_cb)(eio_req *req); |
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|
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#ifndef EIO_REQ_MEMBERS |
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# define EIO_REQ_MEMBERS |
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#endif |
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|
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#ifndef EIO_STRUCT_STAT |
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# ifdef _WIN32 |
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# define EIO_STRUCT_STAT struct _stati64 |
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# define EIO_STRUCT_STATI64 |
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# else |
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# define EIO_STRUCT_STAT struct stat |
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# endif |
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#endif |
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|
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#ifdef _WIN32 |
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typedef int eio_uid_t; |
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typedef int eio_gid_t; |
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#ifdef __MINGW32__ /* no intptr_t */ |
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typedef ssize_t eio_ssize_t; |
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#else |
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typedef intptr_t eio_ssize_t; /* or SSIZE_T */ |
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#endif |
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#if __GNUC__ |
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typedef long long eio_ino_t; /* signed for compatibility to msvc */ |
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#else |
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typedef __int64 eio_ino_t; /* unsigned not supported by msvc */ |
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#endif |
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#else |
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typedef uid_t eio_uid_t; |
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typedef gid_t eio_gid_t; |
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typedef ssize_t eio_ssize_t; |
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typedef ino_t eio_ino_t; |
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#endif |
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|
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#ifndef EIO_STRUCT_STATVFS |
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# define EIO_STRUCT_STATVFS struct statvfs |
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#endif |
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|
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/* managing working directories */ |
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|
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typedef struct eio_pwd *eio_wd; |
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|
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#define EIO_CWD 0 /* the current working directory of the process, guaranteed to be a null pointer */ |
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#define EIO_INVALID_WD ((eio_wd)(int)-1) /* failure return for eio_wd_open */ |
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|
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eio_wd eio_wd_open_sync (eio_wd wd, const char *path); |
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void eio_wd_close_sync (eio_wd wd); |
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|
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/* for readdir */ |
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|
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/* eio_readdir flags */ |
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enum |
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{ |
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EIO_READDIR_DENTS = 0x01, /* ptr2 contains eio_dirents, not just the (unsorted) names */ |
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EIO_READDIR_DIRS_FIRST = 0x02, /* dirents gets sorted into a good stat() ing order to find directories first */ |
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EIO_READDIR_STAT_ORDER = 0x04, /* dirents gets sorted into a good stat() ing order to quickly stat all files */ |
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EIO_READDIR_FOUND_UNKNOWN = 0x80, /* set by eio_readdir when *_ARRAY was set and any TYPE=UNKNOWN's were found */ |
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|
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EIO_READDIR_CUSTOM1 = 0x100, /* for use by apps */ |
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EIO_READDIR_CUSTOM2 = 0x200 /* for use by apps */ |
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}; |
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|
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/* using "typical" values in the hope that the compiler will do something sensible */ |
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enum eio_dtype |
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{ |
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EIO_DT_UNKNOWN = 0, |
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EIO_DT_FIFO = 1, |
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EIO_DT_CHR = 2, |
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EIO_DT_MPC = 3, /* multiplexed char device (v7+coherent) */ |
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EIO_DT_DIR = 4, |
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EIO_DT_NAM = 5, /* xenix special named file */ |
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EIO_DT_BLK = 6, |
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EIO_DT_MPB = 7, /* multiplexed block device (v7+coherent) */ |
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EIO_DT_REG = 8, |
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EIO_DT_NWK = 9, /* HP-UX network special */ |
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EIO_DT_CMP = 9, /* VxFS compressed */ |
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EIO_DT_LNK = 10, |
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/* DT_SHAD = 11,*/ |
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EIO_DT_SOCK = 12, |
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EIO_DT_DOOR = 13, /* solaris door */ |
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EIO_DT_WHT = 14, |
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EIO_DT_MAX = 15 /* highest DT_VALUE ever, hopefully */ |
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}; |
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|
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struct eio_dirent |
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{ |
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int nameofs; /* offset of null-terminated name string in (char *)req->ptr2 */ |
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unsigned short namelen; /* size of filename without trailing 0 */ |
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unsigned char type; /* one of EIO_DT_* */ |
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signed char score; /* internal use */ |
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eio_ino_t inode; /* the inode number, if available, otherwise unspecified */ |
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}; |
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|
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/* eio_msync flags */ |
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enum |
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{ |
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EIO_MS_ASYNC = 1, |
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EIO_MS_INVALIDATE = 2, |
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EIO_MS_SYNC = 4 |
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}; |
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|
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/* eio_mtouch flags */ |
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enum |
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{ |
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EIO_MT_MODIFY = 1 |
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}; |
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|
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/* eio_sync_file_range flags */ |
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enum |
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{ |
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EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1, |
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EIO_SYNC_FILE_RANGE_WRITE = 2, |
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EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4 |
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}; |
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|
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/* eio_fallocate flags */ |
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enum |
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{ |
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/* these MUST match the value in linux/falloc.h */ |
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EIO_FALLOC_FL_KEEP_SIZE = 1, |
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EIO_FALLOC_FL_PUNCH_HOLE = 2 |
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}; |
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|
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/* timestamps and differences - feel free to use double in your code directly */ |
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typedef double eio_tstamp; |
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|
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/* the eio request structure */ |
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enum |
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{ |
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EIO_CUSTOM, |
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EIO_WD_OPEN, EIO_WD_CLOSE, |
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|
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EIO_CLOSE, EIO_DUP2, |
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EIO_SEEK, EIO_READ, EIO_WRITE, |
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EIO_READAHEAD, EIO_SENDFILE, |
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EIO_FSTAT, EIO_FSTATVFS, |
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EIO_FTRUNCATE, EIO_FUTIME, EIO_FCHMOD, EIO_FCHOWN, |
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EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, EIO_SYNCFS, |
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EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, EIO_FALLOCATE, |
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EIO_MLOCK, EIO_MLOCKALL, |
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EIO_GROUP, EIO_NOP, |
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EIO_BUSY, |
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|
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/* these use wd + ptr1, but are emulated */ |
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EIO_REALPATH, |
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EIO_READDIR, |
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|
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/* all the following requests use wd + ptr1 as path in xxxat functions */ |
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EIO_OPEN, |
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EIO_STAT, EIO_LSTAT, EIO_STATVFS, |
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EIO_TRUNCATE, |
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EIO_UTIME, |
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EIO_CHMOD, |
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EIO_CHOWN, |
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EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, |
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EIO_MKNOD, |
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EIO_LINK, EIO_SYMLINK, EIO_READLINK, |
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|
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EIO_REQ_TYPE_NUM |
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}; |
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|
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/* seek whence modes */ |
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/* these are guaranteed to hasve the traditional 0, 1, 2 values, */ |
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/* so you might as wlel use those */ |
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enum |
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{ |
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EIO_SEEK_SET = 0, |
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EIO_SEEK_CUR = 1, |
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EIO_SEEK_END = 2 |
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}; |
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|
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|
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/* mlockall constants */ |
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enum |
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{ |
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EIO_MCL_CURRENT = 1, |
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EIO_MCL_FUTURE = 2 |
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}; |
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|
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/* request priorities */ |
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|
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enum { |
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EIO_PRI_MIN = -4, |
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EIO_PRI_MAX = 4, |
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EIO_PRI_DEFAULT = 0 |
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}; |
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|
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/* eio request structure */ |
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/* this structure is mostly read-only */ |
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/* when initialising it, all members must be zero-initialised */ |
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struct eio_req |
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{ |
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eio_req volatile *next; /* private ETP */ |
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|
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eio_wd wd; /* all applicable requests: working directory of pathname, old name; wd_open: return wd */ |
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|
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eio_ssize_t result; /* result of syscall, e.g. result = read (... */ |
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off_t offs; /* read, write, truncate, readahead, sync_file_range, fallocate: file offset, mknod: dev_t */ |
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size_t size; /* read, write, readahead, sendfile, msync, mlock, sync_file_range, fallocate: length */ |
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void *ptr1; /* all applicable requests: pathname, old name; readdir: optional eio_dirents */ |
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void *ptr2; /* all applicable requests: new name or memory buffer; readdir: name strings */ |
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eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ |
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eio_tstamp nv2; /* utime, futime: mtime */ |
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|
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int type; /* EIO_xxx constant ETP */ |
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int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync, mlockall, readdir: flags */ |
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long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, seek: whence, sync_file_range, fallocate: flags */ |
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long int3; /* chown, fchown: gid; rename, link: working directory of new name */ |
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int errorno; /* errno value on syscall return */ |
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|
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#if __i386 || __amd64 |
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unsigned char cancelled; |
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#else |
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sig_atomic_t cancelled; |
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#endif |
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|
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unsigned char flags; /* private */ |
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signed char pri; /* the priority */ |
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|
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void *data; |
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eio_cb finish; |
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void (*destroy)(eio_req *req); /* called when request no longer needed */ |
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void (*feed)(eio_req *req); /* only used for group requests */ |
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|
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EIO_REQ_MEMBERS |
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|
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eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */ |
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}; |
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|
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/* _private_ request flags */ |
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enum { |
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EIO_FLAG_PTR1_FREE = 0x01, /* need to free(ptr1) */ |
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EIO_FLAG_PTR2_FREE = 0x02, /* need to free(ptr2) */ |
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EIO_FLAG_GROUPADD = 0x04 /* some request was added to the group */ |
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}; |
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|
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/* undocumented/unsupported/private helper */ |
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/*void eio_page_align (void **addr, size_t *length);*/ |
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|
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/* returns < 0 on error, errno set |
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* need_poll, if non-zero, will be called when results are available |
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* and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). |
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* done_poll is called when the need to poll is gone. |
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*/ |
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int eio_init (void (*want_poll)(void), void (*done_poll)(void)); |
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|
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/* must be called regularly to handle pending requests */ |
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/* returns 0 if all requests were handled, -1 if not, or the value of EIO_FINISH if != 0 */ |
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int eio_poll (void); |
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|
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/* stop polling if poll took longer than duration seconds */ |
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void eio_set_max_poll_time (eio_tstamp nseconds); |
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/* do not handle more then count requests in one call to eio_poll_cb */ |
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void eio_set_max_poll_reqs (unsigned int nreqs); |
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|
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/* set minimum required number |
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* maximum wanted number |
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* or maximum idle number of threads */ |
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void eio_set_min_parallel (unsigned int nthreads); |
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void eio_set_max_parallel (unsigned int nthreads); |
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void eio_set_max_idle (unsigned int nthreads); |
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void eio_set_idle_timeout (unsigned int seconds); |
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|
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unsigned int eio_nreqs (void); /* number of requests in-flight */ |
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unsigned int eio_nready (void); /* number of not-yet handled requests */ |
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unsigned int eio_npending (void); /* number of finished but unhandled requests */ |
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unsigned int eio_nthreads (void); /* number of worker threads in use currently */ |
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|
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/*****************************************************************************/ |
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/* convenience wrappers */ |
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|
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#ifndef EIO_NO_WRAPPERS |
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eio_req *eio_wd_open (const char *path, int pri, eio_cb cb, void *data); /* result=wd */ |
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eio_req *eio_wd_close (eio_wd wd, int pri, eio_cb cb, void *data); |
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eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ |
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eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ |
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eio_req *eio_sync (int pri, eio_cb cb, void *data); |
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eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); |
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eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); |
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eio_req *eio_syncfs (int fd, int pri, eio_cb cb, void *data); |
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eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data); |
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eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data); |
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eio_req *eio_mlock (void *addr, size_t length, int pri, eio_cb cb, void *data); |
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eio_req *eio_mlockall (int flags, int pri, eio_cb cb, void *data); |
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eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data); |
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eio_req *eio_fallocate (int fd, int mode, off_t offset, size_t len, int pri, eio_cb cb, void *data); |
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eio_req *eio_close (int fd, int pri, eio_cb cb, void *data); |
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eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data); |
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eio_req *eio_seek (int fd, off_t offset, int whence, int pri, eio_cb cb, void *data); |
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eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
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eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
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eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
| 347 |
eio_req *eio_fstatvfs (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
| 348 |
eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); |
| 349 |
eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data); |
| 350 |
eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data); |
| 351 |
eio_req *eio_fchown (int fd, eio_uid_t uid, eio_gid_t gid, int pri, eio_cb cb, void *data); |
| 352 |
eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data); |
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eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void *data); |
| 354 |
eio_req *eio_open (const char *path, int flags, mode_t mode, int pri, eio_cb cb, void *data); |
| 355 |
eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); |
| 356 |
eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data); |
| 357 |
eio_req *eio_chown (const char *path, eio_uid_t uid, eio_gid_t gid, int pri, eio_cb cb, void *data); |
| 358 |
eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data); |
| 359 |
eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data); |
| 360 |
eio_req *eio_readdir (const char *path, int flags, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
| 361 |
eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data); |
| 362 |
eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data); |
| 363 |
eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
| 364 |
eio_req *eio_realpath (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
| 365 |
eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
| 366 |
eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
| 367 |
eio_req *eio_statvfs (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
| 368 |
eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data); |
| 369 |
eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
| 370 |
eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
| 371 |
eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
| 372 |
eio_req *eio_custom (void (*execute)(eio_req *), int pri, eio_cb cb, void *data); |
| 373 |
#endif |
| 374 |
|
| 375 |
/*****************************************************************************/ |
| 376 |
/* groups */ |
| 377 |
|
| 378 |
eio_req *eio_grp (eio_cb cb, void *data); |
| 379 |
void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); |
| 380 |
void eio_grp_limit (eio_req *grp, int limit); |
| 381 |
void eio_grp_add (eio_req *grp, eio_req *req); |
| 382 |
void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ |
| 383 |
|
| 384 |
/*****************************************************************************/ |
| 385 |
/* request api */ |
| 386 |
|
| 387 |
/* true if the request was cancelled, useful in the invoke callback */ |
| 388 |
#define EIO_CANCELLED(req) ((req)->cancelled) |
| 389 |
|
| 390 |
#define EIO_RESULT(req) ((req)->result) |
| 391 |
/* returns a pointer to the result buffer allocated by eio */ |
| 392 |
#define EIO_BUF(req) ((req)->ptr2) |
| 393 |
#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) |
| 394 |
#define EIO_STATVFS_BUF(req) ((EIO_STRUCT_STATVFS *)EIO_BUF(req)) |
| 395 |
#define EIO_PATH(req) ((char *)(req)->ptr1) |
| 396 |
|
| 397 |
/* submit a request for execution */ |
| 398 |
void eio_submit (eio_req *req); |
| 399 |
/* cancel a request as soon fast as possible, if possible */ |
| 400 |
void eio_cancel (eio_req *req); |
| 401 |
|
| 402 |
/*****************************************************************************/ |
| 403 |
/* convenience functions */ |
| 404 |
|
| 405 |
eio_ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); |
| 406 |
|
| 407 |
#ifdef __cplusplus |
| 408 |
} |
| 409 |
#endif |
| 410 |
|
| 411 |
#endif |
| 412 |
|
