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1 | /* |
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2 | * libeio API header |
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3 | * |
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4 | * Copyright (c) 2007,2008 Marc Alexander Lehmann <libeio@schmorp.de> |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without modifica- |
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8 | * tion, are permitted provided that the following conditions are met: |
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9 | * |
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10 | * 1. Redistributions of source code must retain the above copyright notice, |
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11 | * this list of conditions and the following disclaimer. |
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12 | * |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | * |
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28 | * Alternatively, the contents of this file may be used under the terms of |
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29 | * the GNU General Public License ("GPL") version 2 or any later version, |
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30 | * in which case the provisions of the GPL are applicable instead of |
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31 | * the above. If you wish to allow the use of your version of this file |
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32 | * only under the terms of the GPL and not to allow others to use your |
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33 | * version of this file under the BSD license, indicate your decision |
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34 | * by deleting the provisions above and replace them with the notice |
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35 | * and other provisions required by the GPL. If you do not delete the |
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36 | * provisions above, a recipient may use your version of this file under |
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37 | * either the BSD or the GPL. |
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38 | */ |
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39 | |
1 | #ifndef EIO_H_ |
40 | #ifndef EIO_H_ |
2 | #define EIO_H_ |
41 | #define EIO_H_ |
3 | |
42 | |
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43 | #ifdef __cplusplus |
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44 | extern "C" { |
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45 | #endif |
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46 | |
4 | #include <stddef.h> |
47 | #include <stddef.h> |
5 | #include <sys/types.h> |
48 | #include <sys/types.h> |
6 | |
49 | |
7 | typedef struct eio_req eio_req; |
50 | typedef struct eio_req eio_req; |
8 | |
51 | |
9 | typedef int (*eio_cb)(eio_req *req); |
52 | typedef int (*eio_cb)(eio_req *req); |
10 | |
53 | |
11 | #ifndef EIO_COMMON |
54 | #ifndef EIO_REQ_MEMBERS |
12 | # define EIO_COMMON |
55 | # define EIO_REQ_MEMBERS |
13 | #endif |
56 | #endif |
14 | |
57 | |
15 | #ifndef EIO_STRUCT_STAT |
58 | #ifndef EIO_STRUCT_STAT |
16 | # define EIO_STRUCT_STAT struct stat |
59 | # define EIO_STRUCT_STAT struct stat |
17 | #endif |
60 | #endif |
18 | |
61 | |
19 | enum { |
62 | enum { |
20 | EIO_QUIT, |
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21 | EIO_OPEN, EIO_CLOSE, EIO_DUP2, |
63 | EIO_OPEN, EIO_CLOSE, EIO_DUP2, |
22 | EIO_READ, EIO_WRITE, |
64 | EIO_READ, EIO_WRITE, |
23 | EIO_READAHEAD, EIO_SENDFILE, |
65 | EIO_READAHEAD, EIO_SENDFILE, |
24 | EIO_STAT, EIO_LSTAT, EIO_FSTAT, |
66 | EIO_STAT, EIO_LSTAT, EIO_FSTAT, |
25 | EIO_TRUNCATE, EIO_FTRUNCATE, |
67 | EIO_TRUNCATE, EIO_FTRUNCATE, |
… | |
… | |
29 | EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, |
71 | EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, |
30 | EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, |
72 | EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, |
31 | EIO_MKNOD, EIO_READDIR, |
73 | EIO_MKNOD, EIO_READDIR, |
32 | EIO_LINK, EIO_SYMLINK, EIO_READLINK, |
74 | EIO_LINK, EIO_SYMLINK, EIO_READLINK, |
33 | EIO_GROUP, EIO_NOP, |
75 | EIO_GROUP, EIO_NOP, |
34 | EIO_BUSY, |
76 | EIO_BUSY, EIO_CUSTOM |
35 | }; |
77 | }; |
36 | |
78 | |
37 | typedef double eio_tstamp; /* feel free to use double in your code directly */ |
79 | typedef double eio_tstamp; /* feel free to use double in your code directly */ |
38 | |
80 | |
39 | /* eio request structure */ |
81 | /* eio request structure */ |
40 | /* this structure is mostly read-only */ |
82 | /* this structure is mostly read-only */ |
41 | struct eio_req |
83 | struct eio_req |
42 | { |
84 | { |
43 | eio_req volatile *next; /* private */ |
85 | eio_req volatile *next; /* private ETP */ |
44 | |
86 | |
45 | ssize_t result; /* result of syscall, e.g. result = read (... */ |
87 | ssize_t result; /* result of syscall, e.g. result = read (... */ |
46 | off_t offs; /* read, write, truncate, readahead: file offset; mknod: dev_t */ |
88 | off_t offs; /* read, write, truncate, readahead: file offset */ |
47 | size_t size; /* read, write, readahead, sendfile: length */ |
89 | size_t size; /* read, write, readahead, sendfile: length */ |
48 | void *ptr1; /* all applicable requests: pathname, old name */ |
90 | void *ptr1; /* all applicable requests: pathname, old name */ |
49 | void *ptr2; /* all applicable requests: new name or memory buffer */ |
91 | void *ptr2; /* all applicable requests: new name or memory buffer */ |
50 | eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ |
92 | eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ |
51 | eio_tstamp nv2; /* utime, futime: mtime */ |
93 | eio_tstamp nv2; /* utime, futime: mtime */ |
52 | |
94 | |
53 | int type; /* EIO_xxx constant */ |
95 | int type; /* EIO_xxx constant ETP */ |
54 | int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */ |
96 | int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */ |
55 | long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */ |
97 | long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */ |
56 | long int3; /* chown, fchown: gid */ |
98 | long int3; /* chown, fchown: gid; mknod: dev_t */ |
57 | int errorno; /* errno value on syscall return */ |
99 | int errorno; /* errno value on syscall return */ |
58 | |
100 | |
59 | unsigned char flags; /* private */ |
101 | unsigned char flags; /* private */ |
60 | signed char pri; /* the priority */ |
102 | signed char pri; /* the priority */ |
61 | |
103 | |
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… | |
76 | }; |
118 | }; |
77 | |
119 | |
78 | enum { |
120 | enum { |
79 | EIO_PRI_MIN = -4, |
121 | EIO_PRI_MIN = -4, |
80 | EIO_PRI_MAX = 4, |
122 | EIO_PRI_MAX = 4, |
81 | |
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82 | EIO_PRI_DEFAULT = 0, |
123 | EIO_PRI_DEFAULT = 0, |
83 | EIO_PRI_BIAS = -EIO_PRI_MIN, |
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84 | EIO_NUM_PRI = EIO_PRI_MAX + EIO_PRI_BIAS + 1 |
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85 | }; |
124 | }; |
86 | |
125 | |
87 | /* returns < 0 on error, errno set |
126 | /* returns < 0 on error, errno set |
88 | * need_poll, if non-zero, will be called when results are available |
127 | * need_poll, if non-zero, will be called when results are available |
89 | * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). |
128 | * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). |
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111 | unsigned int eio_nready (void); /* number of not-yet handled requests */ |
150 | unsigned int eio_nready (void); /* number of not-yet handled requests */ |
112 | unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ |
151 | unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ |
113 | unsigned int eio_nthreads (void); /* number of worker threads in use currently */ |
152 | unsigned int eio_nthreads (void); /* number of worker threads in use currently */ |
114 | |
153 | |
115 | /*****************************************************************************/ |
154 | /*****************************************************************************/ |
116 | /* high-level request API */ |
155 | /* convinience wrappers */ |
117 | |
156 | |
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157 | #ifndef EIO_NO_WRAPPERS |
118 | eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ |
158 | eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ |
119 | eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ |
159 | eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ |
120 | eio_req *eio_sync (int pri, eio_cb cb, void *data); |
160 | eio_req *eio_sync (int pri, eio_cb cb, void *data); |
121 | eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); |
161 | eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); |
122 | eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); |
162 | eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); |
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145 | eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
185 | eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
146 | eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data); |
186 | eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data); |
147 | eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
187 | eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
148 | eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
188 | eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
149 | eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
189 | eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
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190 | eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data); |
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191 | #endif |
150 | |
192 | |
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193 | /*****************************************************************************/ |
151 | /* for groups */ |
194 | /* groups */ |
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195 | |
152 | eio_req *eio_grp (eio_cb cb, void *data); |
196 | eio_req *eio_grp (eio_cb cb, void *data); |
153 | void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); |
197 | void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); |
154 | void eio_grp_limit (eio_req *grp, int limit); |
198 | void eio_grp_limit (eio_req *grp, int limit); |
155 | void eio_grp_add (eio_req *grp, eio_req *req); |
199 | void eio_grp_add (eio_req *grp, eio_req *req); |
156 | void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ |
200 | void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ |
157 | |
201 | |
158 | /* cancel a request as soon fast as possible */ |
202 | /*****************************************************************************/ |
159 | void eio_cancel (eio_req *req); |
203 | /* request api */ |
160 | /* destroy a request that has never been submitted */ |
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161 | void eio_destroy (eio_req *req); |
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162 | |
204 | |
163 | /* true if the request was cancelled, useful in the invoke callback */ |
205 | /* true if the request was cancelled, useful in the invoke callback */ |
164 | #define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) |
206 | #define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) |
165 | |
207 | |
166 | #define EIO_RESULT(req) ((req)->result) |
208 | #define EIO_RESULT(req) ((req)->result) |
167 | /* returns a pointer to the result buffer allocated by eio */ |
209 | /* returns a pointer to the result buffer allocated by eio */ |
168 | #define EIO_BUF(req) ((req)->ptr2) |
210 | #define EIO_BUF(req) ((req)->ptr2) |
169 | #define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) |
211 | #define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) |
170 | #define EIO_PATH(req) ((char *)(req)->ptr1) |
212 | #define EIO_PATH(req) ((char *)(req)->ptr1) |
171 | |
213 | |
172 | /*****************************************************************************/ |
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173 | /* low-level request API */ |
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174 | |
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175 | /* must be used to initialise eio_req's */ |
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176 | #define EIO_INIT(req,prio,finish_cb, destroy_cb) \ |
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177 | memset ((req), 0, sizeof (eio_req)); \ |
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178 | (req)->pri = (prio) + EIO_PRI_BIAS; \ |
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179 | (req)->finish = (finish_cb); \ |
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180 | (req)->destroy = (destroy_cb) |
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181 | |
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182 | /* submit a request for execution */ |
214 | /* submit a request for execution */ |
183 | void eio_submit (eio_req *req); |
215 | void eio_submit (eio_req *req); |
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216 | /* cancel a request as soon fast as possible, if possible */ |
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217 | void eio_cancel (eio_req *req); |
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218 | /* destroy a request that has never been submitted */ |
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219 | void eio_destroy (eio_req *req); |
184 | |
220 | |
185 | /*****************************************************************************/ |
221 | /*****************************************************************************/ |
186 | /* convinience functions */ |
222 | /* convinience functions */ |
187 | |
223 | |
188 | ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); |
224 | ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); |
189 | |
225 | |
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226 | #ifdef __cplusplus |
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227 | } |
190 | #endif |
228 | #endif |
191 | |
229 | |
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230 | #endif |
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231 | |