#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <libaio.h>
int main()
{
io_context_t ctx;
unsigned nr_events = 10;
memset(&ctx, 0, sizeof(ctx));
int errcode = io_setup(nr_events, &ctx);
if (errcode == 0)
printf("io_setup success\n");
else
printf("io_setup error: :%d:%s\n", errcode, strerror(-errcode));
int fd = open("direct.txt", O_CREAT|O_DIRECT|O_WRONLY, S_IRWXU|S_IRWXG|S_IROTH);
printf("open: %s\n", strerror(errno));
char * buf;
errcode = posix_memalign((void**)&buf, sysconf(_SC_PAGESIZE), sysconf(_SC_PAGESIZE));
printf("posix_memalign: %s\n", strerror(errcode));
strcpy(buf, "hello xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
struct iocb *iocbpp = (struct iocb *)malloc(sizeof(struct iocb));
memset(iocbpp, 0, sizeof(struct iocb));
iocbpp[0].data = buf;
iocbpp[0].aio_lio_opcode = IO_CMD_PWRITE;
iocbpp[0].aio_reqprio = 0;
iocbpp[0].aio_fildes = fd;
iocbpp[0].u.c.buf = buf;
iocbpp[0].u.c.nbytes = sysconf(_SC_PAGESIZE);
iocbpp[0].u.c.offset = 0;
int n = io_submit(ctx, 1, &iocbpp);
printf("==io_submit==: %d:\n", n);
struct io_event events[10];
struct timespec timeout = {1, 100};
//n = io_getevents(ctx, 1, 10, events, &timeout);
//printf("io_getevents: %d:\n", n);
close(fd);
io_destroy(ctx);
return 0;
}
编译方法：gcc -0 myaio myaio.c -laio -D_GNU_SOURCE
