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dpavlin |
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openisis - an open implementation of the CDS/ISIS database |
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Version 0.8.x (patchlevel see file Version) |
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Copyright (C) 2001-2003 by Erik Grziwotz, erik@openisis.org |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public |
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License along with this library; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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see README for more information |
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EOH */ |
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#ifndef LIO_H |
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/* |
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$Id: lio.h,v 1.22 2003/05/29 18:02:54 kripke Exp $ |
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I/O support for the openisis library. |
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Provides non-blocking, look-ahead network streams and other nice stuff. |
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*/ |
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#include "luti.h" |
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#include "lll.h" |
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/* ************************************************************ |
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time |
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*/ |
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/* struct wrapper just for struct Tm *Time */ |
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typedef struct Tm { |
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lll millis; |
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} Tm; |
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/** |
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set Tm to current time, return difference in millis |
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*/ |
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extern int timeUpd ( Tm * ); |
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/** |
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print generalized time yyyyMMddHHmmss + 0 byte to buffer |
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if Tm is 0, current time is used |
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if Tm.millis is 0, Tm is updated |
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return buffer, which must have 15 bytes |
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*/ |
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extern char *timeGtf ( char *buf, Tm * ); |
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/** |
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like timeAsc, but with additional 3 digits millis |
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return buffer, which must have 18 bytes |
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*/ |
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extern char *timeGtfm ( char *buf, Tm * ); |
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/** |
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nanosl |
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*/ |
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extern void timeSleep ( Tm * ); |
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/* ************************************************************ |
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system files |
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*/ |
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/** |
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system file is a non-negative 32bit int including status bits. |
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main status bits are LIO_IN and LIO_OUT, |
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which are set by open and cleared by close. |
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negative values are reserved for use by non-system based streams. |
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*/ |
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#define LIO_WANT 0xfff00000 /* what we want: open flags */ |
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#define LIO_FD 0x0000ffff /* what we get: system fd */ |
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#define LIO_STAT 0x000f0000 /* how it's going: it's status */ |
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/* status flags */ |
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#define LIO_IN 0x00010000 /* support input */ |
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#define LIO_OUT 0x00020000 /* support output */ |
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#define LIO_INOUT 0x00030000 /* support both */ |
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#define LIO_ISOPEN( file ) (LIO_INOUT & (file)) |
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/* common requirements that are also used by non-system streams. */ |
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#define LIO_RD 0x00100000 /* shall be opened for input */ |
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#define LIO_WR 0x00200000 /* shall be opened for output */ |
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#define LIO_RDWR 0x00300000 /* shall be opened for both */ |
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#define LIO_SYNC 0x00400000 /* with WR: syncing output */ |
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#define LIO_NBLK 0x00800000 /* non blocking IO (not used) */ |
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/* system files only. */ |
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#define LIO_CREAT 0x01000000 /* with WR: shall be created */ |
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#define LIO_TRY 0x01000000 /* w/o WR: do not complain if open fails */ |
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#define LIO_TRUNC 0x02000000 /* with WR: shall be truncated */ |
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#define LIO_SEEK 0x04000000 /* random access (with WR: else append mode) */ |
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#define LIO_SOCK 0x08000000 /* is a socket (support shutdown) */ |
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/* locking */ |
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#define LIO_TLOCK 0x10000000 /* try locking (EX with WR) */ |
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#define LIO_WLOCK 0x20000000 /* lock waiting (EX with WR) */ |
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#define LIO_FLOCK 0x30000000 /* any locking is set */ |
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/** create a new fid based on name and flags. |
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name may be &i to use fd i, esp. for i=0,1 or 2. |
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@return non-negative file or some error code |
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*/ |
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extern int lio_open ( const char *name, int flags ); |
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extern int lio_close ( int *file, int flags ); |
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extern int lio_size ( int file ); |
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extern unsigned lio_time ( int file ); /* mtime sec */ |
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extern int lio_in; |
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extern int lio_out; |
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extern int lio_err; |
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/* |
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Like the syscalls, this returns the number of bytes on success. |
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Unlike the syscalls, it returns 0 rather than an error |
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when no bytes are available after interrupt (EINTR) |
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or on non-blocking IO (EAGAIN); i.e. you may try later. |
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On error, a negative value is returned. |
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On errors that render the file unusable, |
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it is closed for input or output, resp. |
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These are most errors but EFAULT (bad buf) |
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and ESPIPE (which clears the SEEK bit). |
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For files that do not have the SEEK bit set, |
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EOF is considered such an error and -LERR_EOF is returned. |
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If you want to stream a disk file like 'tail -f', set the SEEK bit. |
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*/ |
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extern int lio_read ( int *file, void *buf, unsigned count ); |
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extern int lio_write ( int *file, const void *buf, unsigned count ); |
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extern int lio_pread ( int *file, void *buf, unsigned count, int offset ); |
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extern int lio_pwrite ( int *file, const void *buf, unsigned count, int offset ); |
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extern int lio_seek ( int *file, int offset ); |
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extern int lio_trunc ( int *file, int offset ); |
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/** |
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open, sync or close a memory mapping |
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@param file pointer to open file handle to map. |
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if file is NULL, *map is unmapped (and set to NULL) |
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else if *map is NULL, length bytes are mapped |
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else *map is synced (flushed) |
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@param length number of bytes to map; if 0, size will be used |
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@return mapped length; if <= 0, *map is set to 0, else to memory region |
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*/ |
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extern int lio_mmap ( int *file, void **map, int length ); |
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/** slurp in a whole file at once. |
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@param buf points to buffer of size sz. |
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lio_slurp will allocate one, if *buf is NULL |
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@param sz maximum number of bytes to read |
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@param name of file to slurp |
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@param opt if != 0, do not complain on failure |
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@return number of bytes read or negative on error |
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*/ |
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extern int lio_slurp ( char **buf, int sz, const char *name, int opt ); |
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/* ************************************************************ |
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streams |
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*/ |
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/** an I/O buffered stream similar to stdio's FILE. |
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Unlike FILE with it's stupid ungetc, |
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it supports efficient scanning of the whole input buffer without |
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actually consuming it. |
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Also unlike at least Linux' glibc's stdio, access is not interlocked. |
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The buffer is typically used for input OR output. |
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However, for internal pipes, the same buffer is used from both ends. |
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High level access functions like printf operate directly on the buffer |
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and call the stream function on buffer underflow or overflow |
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(or explicit flush). |
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*/ |
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typedef int lio_sfunc ( struct Ios *s, int op ); |
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enum { |
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LIO_BUFSIZ = 8192 |
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}; |
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typedef struct Buf { |
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/* struct Buf *nxt; chain -- not used */ |
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short fill; /* total #bytes in the buffer */ |
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short done; /* #bytes done */ |
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unsigned char c[LIO_BUFSIZ]; /* actual buffer may be longer */ |
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} Buf; |
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/* fill - done is the number of available bytes */ |
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#define LIO_BAVAIL( b ) ((b)->fill - (b)->done) |
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#define LIO_BINIT( b ) do { \ |
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/*(b)->nxt = 0;*/ (b)->fill = 0; (b)->done = 0; \ |
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} while (0) |
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#define LIO_BINITIALIZER { 0,0,"" } |
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typedef struct Ios { |
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lio_sfunc *func; |
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const char *name; /* stream's name */ |
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int file; /* file "id" and flags as above */ |
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int pos; /* logical position of buffer start within stream */ |
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Buf b; |
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} Ios; |
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#define LIO_SISOPEN( s ) LIO_ISOPEN( (s)->file ) |
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#define LIO_SAVAIL( s ) LIO_BAVAIL( &(s)->b ) |
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#define LIO_SINIT( s, fun, nam, fil ) do { \ |
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(s)->func = fun; (s)->name = nam; (s)->file = fil; \ |
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(s)->pos = 0; \ |
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LIO_BINIT( &(s)->b ); \ |
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} while (0) |
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#define LIO_STDINIT( s, nam, fil ) LIO_SINIT( s, lio_stdio, nam, fil ) |
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#define LIO_SINITIALIZER( fun, nam, fil ) { fun, nam, fil, 0, LIO_BINITIALIZER } |
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#define LIO_STDINITIALIZER( nam, fil ) LIO_SINITIALIZER( lio_stdio, nam, fil ) |
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/** stream operations. |
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*/ |
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enum { |
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LIO_SSIZE, /* tell the size of the stream structure */ |
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LIO_SOPEN, /* initialize the structure */ |
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LIO_SCLOSE, /* close */ |
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LIO_SPURGE, /* kill the done bytes. return fill buffer size */ |
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LIO_SFILL, /* try to refill the buffer (poll input). return # new bytes */ |
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LIO_SFLUSH, /* try to flush the buffer. return # bytes written */ |
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LIO_SPUSH /* push input stream: munge prefilled input */ |
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}; |
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/** |
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"abstract" base implementation of stream. |
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not very useful in itself, but used by derived impl. |
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*/ |
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extern int ioStream ( Ios *s, int op ); |
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/** |
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stream func based on system file to mimic stdio. |
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on LIO_SOPEN, the fid is set by lio_open based on name. |
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other ops used the correponding lio system call. |
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*/ |
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extern int ioStdio ( Ios *s, int op ); |
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#define LIO_OPEN( s ) (s)->func( (s), LIO_SOPEN ) |
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#define LIO_CLOSE( s ) (s)->func( (s), LIO_SCLOSE ) |
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#define LIO_FILL( s ) (s)->func( (s), LIO_SFILL ) |
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#define LIO_FLUSH( s ) (s)->func( (s), LIO_SFLUSH ) |
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/* ************************************************************ |
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inter process communication |
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*/ |
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extern CLockFunc *lio_lock; |
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#define LIO_LOCK() (NULL != lio_lock && lio_lock(OPENISIS_LOCK)) |
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#define LIO_RELE() (NULL != lio_lock && lio_lock(OPENISIS_RELE)) |
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#define LIO_WAIT( c ) (NULL != lio_lock && lio_lock(OPENISIS_WAIT \ |
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| (OPENISIS_COND & (c)))) |
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#define LIO_WAKE( c ) (NULL != lio_lock && lio_lock(OPENISIS_WAKE \ |
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| (OPENISIS_COND & (c)))) |
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#define LIO_H |
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#endif /* LIO_H */ |