You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
68 lines
1.5 KiB
68 lines
1.5 KiB
/*
|
|
* 测试成功时输出：
|
|
* " Hello, mmap success."
|
|
* 测试失败时输出：
|
|
* "mmap error."
|
|
*/
|
|
#define __LIBRARY__
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <stdarg.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include "new.h"
|
|
|
|
_syscall2(int,munmap,void *,addr,size_t,length)
|
|
|
|
void *mmap(void *addr, size_t length, ...)
|
|
{
|
|
register int res;
|
|
unsigned long argv_list[4];
|
|
va_list arg;
|
|
va_start(arg,length);
|
|
argv_list[0]=(unsigned long)va_arg(arg,int);
|
|
argv_list[1]=(unsigned long)va_arg(arg,int);
|
|
argv_list[2]=(unsigned long)va_arg(arg,int);
|
|
argv_list[3]=(unsigned long)va_arg(arg,int);
|
|
printf("a:%d,%d,%d,%d\n",argv_list[0],argv_list[1],argv_list[2],argv_list[3]);
|
|
__asm__("int $0x80"
|
|
:"=a" (res)
|
|
:"0" (__NR_mmap),"b" (addr),"c" (length),
|
|
"d" (argv_list));
|
|
if (res>=0)
|
|
return (void *)res;
|
|
errno = -res;
|
|
return (void *)-1;
|
|
}
|
|
|
|
static struct stat kst;
|
|
void test_mmap(void){
|
|
char *array;
|
|
const char *str = " Hello, mmap success.";
|
|
int fd;
|
|
|
|
fd = open("test_mmap.txt", O_RDWR | O_CREAT, S_IRUSR|S_IWUSR);
|
|
write(fd, str, strlen(str));
|
|
fstat(fd, &kst);
|
|
printf("file len: %d\n", (int)kst.st_size);
|
|
array = mmap(NULL, kst.st_size, PROT_WRITE | PROT_READ, MAP_FILE | MAP_SHARED, fd, 0);
|
|
printf("mmap addr: %x\n", (unsigned int)array);
|
|
|
|
if (array == MAP_FAILED) {
|
|
printf("mmap error.\n");
|
|
}else{
|
|
printf("mmap content: %s\n", array);
|
|
munmap(array, kst.st_size);
|
|
}
|
|
|
|
close(fd);
|
|
}
|
|
|
|
int main(void){
|
|
test_mmap();
|
|
return 0;
|
|
}
|