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Comparing libeio/eio.h (file contents):
Revision 1.23 by root, Fri Jun 12 16:48:08 2009 UTC vs.
Revision 1.38 by root, Thu Jul 14 19:19:22 2011 UTC

1/* 1/*
2 * libeio API header 2 * libeio API header
3 * 3 *
4 * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libeio@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libeio@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without modifica- 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met: 8 * tion, are permitted provided that the following conditions are met:
9 * 9 *
… …
43#ifdef __cplusplus 43#ifdef __cplusplus
44extern "C" { 44extern "C" {
45#endif 45#endif
46 46
47#include <stddef.h> 47#include <stddef.h>
48#include <signal.h>
48#include <sys/types.h> 49#include <sys/types.h>
49 50
50typedef struct eio_req eio_req; 51typedef struct eio_req eio_req;
51typedef struct eio_dirent eio_dirent; 52typedef struct eio_dirent eio_dirent;
52 53
… …
55#ifndef EIO_REQ_MEMBERS 56#ifndef EIO_REQ_MEMBERS
56# define EIO_REQ_MEMBERS 57# define EIO_REQ_MEMBERS
57#endif 58#endif
58 59
59#ifndef EIO_STRUCT_STAT 60#ifndef EIO_STRUCT_STAT
61# ifdef _WIN32
62# define EIO_STRUCT_STAT struct _stati64
63# define EIO_STRUCT_STATI64
64# else
60# define EIO_STRUCT_STAT struct stat 65# define EIO_STRUCT_STAT struct stat
66# endif
67#endif
68
69#ifndef EIO_STRUCT_STATVFS
70# define EIO_STRUCT_STATVFS struct statvfs
61#endif 71#endif
62 72
63/* for readdir */ 73/* for readdir */
64 74
65/* eio_readdir flags */ 75/* eio_readdir flags */
66enum { 76enum
77{
67 EIO_READDIR_DENTS = 0x01, /* ptr2 contains eio_dirents, not just the (unsorted) names */ 78 EIO_READDIR_DENTS = 0x01, /* ptr2 contains eio_dirents, not just the (unsorted) names */
68 EIO_READDIR_DIRS_FIRST = 0x02, /* dirents gets sorted into a good stat() ing order to find directories first */ 79 EIO_READDIR_DIRS_FIRST = 0x02, /* dirents gets sorted into a good stat() ing order to find directories first */
69 EIO_READDIR_STAT_ORDER = 0x04, /* dirents gets sorted into a good stat() ing order to quickly stat all files */ 80 EIO_READDIR_STAT_ORDER = 0x04, /* dirents gets sorted into a good stat() ing order to quickly stat all files */
70 EIO_READDIR_FOUND_UNKNOWN = 0x80, /* set by eio_readdir when *_ARRAY was set and any TYPE=UNKNOWN's were found */ 81 EIO_READDIR_FOUND_UNKNOWN = 0x80, /* set by eio_readdir when *_ARRAY was set and any TYPE=UNKNOWN's were found */
71 82
72 EIO_READDIR_CUSTOM1 = 0x100, /* for use by apps */ 83 EIO_READDIR_CUSTOM1 = 0x100, /* for use by apps */
73 EIO_READDIR_CUSTOM2 = 0x200 /* for use by apps */ 84 EIO_READDIR_CUSTOM2 = 0x200 /* for use by apps */
74}; 85};
75 86
76/* using "typical" values in the hope that the compiler will do something sensible */ 87/* using "typical" values in the hope that the compiler will do something sensible */
77enum eio_dtype { 88enum eio_dtype
89{
78 EIO_DT_UNKNOWN = 0, 90 EIO_DT_UNKNOWN = 0,
79 EIO_DT_FIFO = 1, 91 EIO_DT_FIFO = 1,
80 EIO_DT_CHR = 2, 92 EIO_DT_CHR = 2,
81 EIO_DT_MPC = 3, /* multiplexed char device (v7+coherent) */ 93 EIO_DT_MPC = 3, /* multiplexed char device (v7+coherent) */
82 EIO_DT_DIR = 4, 94 EIO_DT_DIR = 4,
… …
92 EIO_DT_DOOR = 13, /* solaris door */ 104 EIO_DT_DOOR = 13, /* solaris door */
93 EIO_DT_WHT = 14, 105 EIO_DT_WHT = 14,
94 EIO_DT_MAX = 15 /* highest DT_VALUE ever, hopefully */ 106 EIO_DT_MAX = 15 /* highest DT_VALUE ever, hopefully */
95}; 107};
96 108
97struct eio_dirent { 109struct eio_dirent
98 char *name; 110{
99 ino_t inode; 111 int nameofs; /* offset of null-terminated name string in (char *)req->ptr2 */
100 unsigned short namelen; 112 unsigned short namelen; /* size of filename without trailing 0 */
101 unsigned char type; 113 unsigned char type; /* one of EIO_DT_* */
102 signed char score; /* internal use */ 114 signed char score; /* internal use */
103 /* 0-4 bytes padding */ 115 ino_t inode; /* the inode number, if available, otherwise unspecified */
116};
117
118/* eio_msync flags */
119enum
120{
121 EIO_MS_ASYNC = 1,
122 EIO_MS_INVALIDATE = 2,
123 EIO_MS_SYNC = 4
124};
125
126/* eio_mtouch flags */
127enum
128{
129 EIO_MT_MODIFY = 1
104}; 130};
105 131
106/* eio_sync_file_range flags */ 132/* eio_sync_file_range flags */
107
108enum { 133enum
134{
109 EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1, 135 EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1,
110 EIO_SYNC_FILE_RANGE_WRITE = 2, 136 EIO_SYNC_FILE_RANGE_WRITE = 2,
111 EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4 137 EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4
112}; 138};
113 139
114typedef double eio_tstamp; /* feel free to use double in your code directly */ 140/* eio_fallocate flags */
141enum
142{
143 EIO_FALLOC_FL_KEEP_SIZE = 1 /* MUST match the value in linux/falloc.h */
144};
145
146/* timestamps and differences - feel free to use double in your code directly */
147typedef double eio_tstamp;
115 148
116/* the eio request structure */ 149/* the eio request structure */
117
118enum { 150enum
151{
119 EIO_CUSTOM, 152 EIO_CUSTOM,
120 EIO_OPEN, EIO_CLOSE, EIO_DUP2, 153 EIO_OPEN, EIO_CLOSE, EIO_DUP2,
121 EIO_READ, EIO_WRITE, 154 EIO_READ, EIO_WRITE,
122 EIO_READAHEAD, EIO_SENDFILE, 155 EIO_READAHEAD, EIO_SENDFILE,
123 EIO_STAT, EIO_LSTAT, EIO_FSTAT, 156 EIO_STAT, EIO_LSTAT, EIO_FSTAT,
157 EIO_STATVFS, EIO_FSTATVFS,
124 EIO_TRUNCATE, EIO_FTRUNCATE, 158 EIO_TRUNCATE, EIO_FTRUNCATE,
125 EIO_UTIME, EIO_FUTIME, 159 EIO_UTIME, EIO_FUTIME,
126 EIO_CHMOD, EIO_FCHMOD, 160 EIO_CHMOD, EIO_FCHMOD,
127 EIO_CHOWN, EIO_FCHOWN, 161 EIO_CHOWN, EIO_FCHOWN,
128 EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, 162 EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC,
129 EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, 163 EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, EIO_FALLOCATE,
164 EIO_MLOCK, EIO_MLOCKALL,
130 EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, 165 EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
131 EIO_MKNOD, EIO_READDIR, 166 EIO_MKNOD, EIO_READDIR,
132 EIO_LINK, EIO_SYMLINK, EIO_READLINK, 167 EIO_LINK, EIO_SYMLINK, EIO_READLINK, EIO_REALPATH,
133 EIO_GROUP, EIO_NOP, 168 EIO_GROUP, EIO_NOP,
134 EIO_BUSY 169 EIO_BUSY
170};
171
172/* mlockall constants */
173enum
174{
175 EIO_MCL_CURRENT = 1,
176 EIO_MCL_FUTURE = 2,
177};
178
179/* request priorities */
180
181enum {
182 EIO_PRI_MIN = -4,
183 EIO_PRI_MAX = 4,
184 EIO_PRI_DEFAULT = 0,
135}; 185};
136 186
137/* eio request structure */ 187/* eio request structure */
138/* this structure is mostly read-only */ 188/* this structure is mostly read-only */
139/* when initialising it, all members must be zero-initialised */ 189/* when initialising it, all members must be zero-initialised */
140struct eio_req 190struct eio_req
141{ 191{
142 eio_req volatile *next; /* private ETP */ 192 eio_req volatile *next; /* private ETP */
143 193
144 ssize_t result; /* result of syscall, e.g. result = read (... */ 194 ssize_t result; /* result of syscall, e.g. result = read (... */
145 off_t offs; /* read, write, truncate, readahead, sync_file_range: file offset */ 195 off_t offs; /* read, write, truncate, readahead, sync_file_range, fallocate: file offset, mknod: dev_t */
146 size_t size; /* read, write, readahead, sendfile, msync, sync_file_range: length */ 196 size_t size; /* read, write, readahead, sendfile, msync, mlock, sync_file_range, fallocate: length */
147 void *ptr1; /* all applicable requests: pathname, old name; readdir: possible output memory buffer */ 197 void *ptr1; /* all applicable requests: pathname, old name; readdir: optional eio_dirents */
148 void *ptr2; /* all applicable requests: new name or memory buffer */ 198 void *ptr2; /* all applicable requests: new name or memory buffer; readdir: name strings */
149 eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ 199 eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */
150 eio_tstamp nv2; /* utime, futime: mtime */ 200 eio_tstamp nv2; /* utime, futime: mtime */
151 201
152 int type; /* EIO_xxx constant ETP */ 202 int type; /* EIO_xxx constant ETP */
153 int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync, readdir: flags */ 203 int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync, mlockall, readdir: flags */
154 long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range: flags */ 204 long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range, fallocate: flags */
155 long int3; /* chown, fchown: gid; mknod: dev_t */ 205 long int3; /* chown, fchown: gid */
156 int errorno; /* errno value on syscall return */ 206 int errorno; /* errno value on syscall return */
207
208#if __i386 || __amd64
209 unsigned char cancelled;
210#else
211 sig_atomic_t cancelled;
212#endif
157 213
158 unsigned char flags; /* private */ 214 unsigned char flags; /* private */
159 signed char pri; /* the priority */ 215 signed char pri; /* the priority */
160 216
161 void *data; 217 void *data;
162 eio_cb finish; 218 eio_cb finish;
163 void (*destroy)(eio_req *req); /* called when requets no longer needed */ 219 void (*destroy)(eio_req *req); /* called when request no longer needed */
164 void (*feed)(eio_req *req); /* only used for group requests */ 220 void (*feed)(eio_req *req); /* only used for group requests */
165 221
166 EIO_REQ_MEMBERS 222 EIO_REQ_MEMBERS
167 223
168 eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */ 224 eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */
169}; 225};
170 226
171/* _private_ flags */ 227/* _private_ request flags */
172enum { 228enum {
173 EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */
174 EIO_FLAG_PTR1_FREE = 0x02, /* need to free(ptr1) */ 229 EIO_FLAG_PTR1_FREE = 0x01, /* need to free(ptr1) */
175 EIO_FLAG_PTR2_FREE = 0x04, /* need to free(ptr2) */ 230 EIO_FLAG_PTR2_FREE = 0x02, /* need to free(ptr2) */
176 EIO_FLAG_GROUPADD = 0x08 /* some request was added to the group */ 231 EIO_FLAG_GROUPADD = 0x04 /* some request was added to the group */
177}; 232};
178 233
179enum { 234/* undocumented/unsupported/private helper */
180 EIO_PRI_MIN = -4, 235/*void eio_page_align (void **addr, size_t *length);*/
181 EIO_PRI_MAX = 4,
182 EIO_PRI_DEFAULT = 0,
183};
184 236
185/* returns < 0 on error, errno set 237/* returns < 0 on error, errno set
186 * need_poll, if non-zero, will be called when results are available 238 * need_poll, if non-zero, will be called when results are available
187 * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). 239 * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself).
188 * done_poll is called when the need to poll is gone. 240 * done_poll is called when the need to poll is gone.
… …
202 * maximum wanted number 254 * maximum wanted number
203 * or maximum idle number of threads */ 255 * or maximum idle number of threads */
204void eio_set_min_parallel (unsigned int nthreads); 256void eio_set_min_parallel (unsigned int nthreads);
205void eio_set_max_parallel (unsigned int nthreads); 257void eio_set_max_parallel (unsigned int nthreads);
206void eio_set_max_idle (unsigned int nthreads); 258void eio_set_max_idle (unsigned int nthreads);
259void eio_set_idle_timeout (unsigned int seconds);
207 260
208unsigned int eio_nreqs (void); /* number of requests in-flight */ 261unsigned int eio_nreqs (void); /* number of requests in-flight */
209unsigned int eio_nready (void); /* number of not-yet handled requests */ 262unsigned int eio_nready (void); /* number of not-yet handled requests */
210unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ 263unsigned int eio_npending (void); /* number of finished but unhandled requests */
211unsigned int eio_nthreads (void); /* number of worker threads in use currently */ 264unsigned int eio_nthreads (void); /* number of worker threads in use currently */
212 265
213/*****************************************************************************/ 266/*****************************************************************************/
214/* convinience wrappers */ 267/* convenience wrappers */
215 268
216#ifndef EIO_NO_WRAPPERS 269#ifndef EIO_NO_WRAPPERS
217eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ 270eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */
218eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ 271eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */
219eio_req *eio_sync (int pri, eio_cb cb, void *data); 272eio_req *eio_sync (int pri, eio_cb cb, void *data);
220eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); 273eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data);
221eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); 274eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data);
222eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data); 275eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
223eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data); 276eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
277eio_req *eio_mlock (void *addr, size_t length, int pri, eio_cb cb, void *data);
278eio_req *eio_mlockall (int flags, int pri, eio_cb cb, void *data);
224eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data); 279eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data);
280eio_req *eio_fallocate (int fd, int mode, off_t offset, size_t len, int pri, eio_cb cb, void *data);
225eio_req *eio_close (int fd, int pri, eio_cb cb, void *data); 281eio_req *eio_close (int fd, int pri, eio_cb cb, void *data);
226eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data); 282eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data);
227eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); 283eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
228eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); 284eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
229eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ 285eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
286eio_req *eio_fstatvfs (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
230eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); 287eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data);
231eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data); 288eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data);
232eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data); 289eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data);
233eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data); 290eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data);
234eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data); 291eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data);
… …
241eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data); 298eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data);
242eio_req *eio_readdir (const char *path, int flags, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ 299eio_req *eio_readdir (const char *path, int flags, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
243eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data); 300eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data);
244eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data); 301eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data);
245eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ 302eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
303eio_req *eio_realpath (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
246eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ 304eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
247eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ 305eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
306eio_req *eio_statvfs (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
248eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data); 307eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data);
249eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data); 308eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
250eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data); 309eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
251eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data); 310eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
252eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data); 311eio_req *eio_custom (void (*execute)(eio_req *), int pri, eio_cb cb, void *data);
253#endif 312#endif
254 313
255/*****************************************************************************/ 314/*****************************************************************************/
256/* groups */ 315/* groups */
257 316
… …
263 322
264/*****************************************************************************/ 323/*****************************************************************************/
265/* request api */ 324/* request api */
266 325
267/* true if the request was cancelled, useful in the invoke callback */ 326/* true if the request was cancelled, useful in the invoke callback */
268#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) 327#define EIO_CANCELLED(req) ((req)->cancelled)
269 328
270#define EIO_RESULT(req) ((req)->result) 329#define EIO_RESULT(req) ((req)->result)
271/* returns a pointer to the result buffer allocated by eio */ 330/* returns a pointer to the result buffer allocated by eio */
272#define EIO_BUF(req) ((req)->ptr2) 331#define EIO_BUF(req) ((req)->ptr2)
273#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) 332#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req))
333#define EIO_STATVFS_BUF(req) ((EIO_STRUCT_STATVFS *)EIO_BUF(req))
274#define EIO_PATH(req) ((char *)(req)->ptr1) 334#define EIO_PATH(req) ((char *)(req)->ptr1)
275 335
276/* submit a request for execution */ 336/* submit a request for execution */
277void eio_submit (eio_req *req); 337void eio_submit (eio_req *req);
278/* cancel a request as soon fast as possible, if possible */ 338/* cancel a request as soon fast as possible, if possible */
279void eio_cancel (eio_req *req); 339void eio_cancel (eio_req *req);
280/* destroy a request that has never been submitted */
281void eio_destroy (eio_req *req);
282 340
283/*****************************************************************************/ 341/*****************************************************************************/
284/* convinience functions */ 342/* convenience functions */
285 343
286ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); 344ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count);
287 345
288#ifdef __cplusplus 346#ifdef __cplusplus
289} 347}

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