This is a simple sample of gwrite(). It reads a file with AsyncRead() and creates a copy of it with gwrite(). Because AsyncRead() can read only 64 KB at a time (or at least the documentation says so), you should modify this sample accordingly to copy large files.
#include <ctype.h>
#include <errno.h>
#include <nwerrno.h>
#include <nwfileio.h>
#include <nwsemaph.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main( int argc, char* argv[]) {
int srcfile;
int dstfile;
LONG loc_sem;
int ccode;
LONG bytes_read;
T_cacheBufferStructure* cache_bufs;
LONG num_of_buffers;
if ( argc != 3) {
puts( "Usage: LOAD GWRITE <src> <dst>\n"
"where <src> - source file name,\n"
" <dst> - destination file name");
return EXIT_FAILURE;
}
if (( srcfile = open( argv[ 1], O_RDONLY)) == -1) {
printf( "open failed, errno = %d ( %s ), NetWareErrno = %d\n",
errno, strerror( errno), NetWareErrno);
return EXIT_FAILURE;
}
if (( dstfile = creat( argv[ 2], 0)) == -1) {
printf( "creat failed, errno = %d ( %s ), NetWareErrno = %d\n",
errno, strerror( errno), NetWareErrno);
close( srcfile);
return EXIT_FAILURE;
}
if (( loc_sem = OpenLocalSemaphore( 0)) == 0) {
printf( "OpenLocalSemaphore failed, errno = %d ( %s ), NetWareErrno = %d\n",
errno, strerror( errno), NetWareErrno);
close( dstfile);
close( srcfile);
return EXIT_FAILURE;
}
if (( ccode = AsyncRead( srcfile,
0,
filelength( srcfile),
&bytes_read,
loc_sem,
&cache_bufs,
&num_of_buffers)) != 0) {
printf( "AsyncRead failed, ccode = %d, errno = %d ( %s ), NetWareErrno = %d\n",
ccode, errno, strerror( errno), NetWareErrno);
CloseLocalSemaphore( loc_sem);
close( dstfile);
close( srcfile);
return EXIT_FAILURE;
}
WaitOnLocalSemaphore( loc_sem);
printf( "bytes_read = %d, num_of_buffers = %d\n", bytes_read, num_of_buffers);
ccode = gwrite( dstfile,
( T_mwriteBufferStructure*) cache_bufs,
num_of_buffers,
&num_of_buffers);
printf( "ccode = %d, written %d buffer(s)\n", ccode, num_of_buffers);
AsyncRelease( cache_bufs);
CloseLocalSemaphore( loc_sem);
close( dstfile);
close( srcfile);
return EXIT_SUCCESS;
}
© 2008 Novell, Inc. All Rights Reserved.
