我的文件应该填充0.我想使用aio_write
来做这个结果我的文件应该看起来像000000000....
但是结果我得到了我的文件充满了垃圾
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
s|▒^@^@^@^@^@^@^@^@^@^@^@^@▒r|▒^@^@^@^@▒▒^?▒(▒▒▒▒s|▒▒
y▒^P^@^@^@^X▒▒▒
s|▒^X^@^@^@▒.....
我甚至无法想象出错是什么。首先,我使用异步写入,所以我需要在da_aio_write
完成时等待
int da_test_wait( struct aiocb *aiorp ){
const struct aiocb *aioptr[1];
int rv;
aioptr[0] = aiorp;
rv = aio_suspend( aioptr, 1, NULL );
if( rv != 0 ){
perror( "aio_suspend failed" );
abort();
}
rv = aio_return( aiorp );
printf( "AIO complete, %d bytes write.\n", rv );
return 1;
}
这也是我的写作功能
int da_aio_write(const int d, struct aiocb *aiorp, void *buf, const int count){
int rv = 0;
memset( (void *)aiorp, 0, sizeof( struct aiocb ) );
aiorp->aio_fildes = d;
aiorp->aio_buf = buf;
aiorp->aio_nbytes = count;
aiorp->aio_offset = 0;
rv = aio_write( aiorp );
if( rv == -1) {
perror("Error da_aio_write\n");
exit(1);
return rv;
}
return rv;
}
和我的主要
int main(int argc, char *argv[] ){
int sk;
int d;
struct aiocb aior;
if(argc == 3){
sk = atoi(argv[2]);
char buffer[MB * MB * sk];
//memset(&aior, 0, sizeof( struct aiocb ));
d = da_open(argv[1]);
da_aio_write( d, &aior, buffer, sizeof(buffer) );
da_test_wait( &aior );
da_close( d );
}
return 0;
}
任何想法我做错了什么? 编辑: 我知道我的da_aio写在main之后结束,因为我编译后得到
File created
dskr1 = 3
AIO complete, 1048576 bytes write.
closed
编辑我的完整更新代码
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/time.h>
#include <string.h>
#include <aio.h>
#include <errno.h>
#define MB 1024
int da_open(const char *name);
int da_aio_write(const int d, struct aiocb *aiorp, void *buf, const int count);
int da_test_wait( struct aiocb *aiorp );
int da_close(int fd);
int da_open(const char *name){
int dskr;
int dskr2;
dskr = open( name, O_RDWR );
if( dskr == -1 ){
printf("File created\n");
dskr2 = open( name, O_WRONLY | O_CREAT, 0644);
}else{
printf("End job!\n");
exit(1);
}
printf( "dskr1 = %d\n", dskr2 );
return dskr2;
}
int da_aio_write(const int d, struct aiocb *aiorp, void *buf, const int count){
int rv = 0;
memset( (void *)aiorp, 0, sizeof( struct aiocb ) );
aiorp->aio_fildes = d;
aiorp->aio_buf = buf;
aiorp->aio_nbytes = count;
aiorp->aio_offset = 0;
rv = aio_write( aiorp );
if( rv == -1) {
perror("Error da_aio_write\n");
exit(1);
return rv;
}
return rv;
}
int da_test_wait( struct aiocb *aiorp ){
const struct aiocb *aioptr[1];
int rv;
aioptr[0] = aiorp;
rv = aio_suspend( aioptr, 1, NULL );
if( rv != 0 ){
perror( "aio_suspend failed" );
abort();
}
rv = aio_return( aiorp );
printf( "AIO complete, %d bytes write.\n", rv );
return 1;
}
int da_close(int fd){
int rv;
rv = close( fd );
if( rv != 0 ) perror ( "close() failed" );
else puts( "closed" );
return rv;
}
int main(int argc, char *argv[] ){
int sk;
int d;
struct aiocb aior;
if(argc == 3){
sk = atoi(argv[2]);
char buffer[MB * MB * sk];
int size;
size = MB * MB * sk;
memset( buffer, '\0', size);
//memset(&aior, '\0', sizeof( struct aiocb ));
d = da_open(argv[1]);
da_aio_write( d, &aior, buffer, sizeof(buffer) );
da_test_wait( &aior );
da_close( d );
}
return 0;
}
答案 0 :(得分:3)
char buffer[MB * MB * sk];
堆栈变量不会自动初始化。所以你的缓冲区包含垃圾。如果那是你要写入文件的内容,则memset
首先为0。