forked from p7px8vou9/system_call_expand
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63 lines
1.3 KiB
63 lines
1.3 KiB
/*
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* 测试成功时输出：
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* " Hello, mmap success."
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* 测试失败时输出：
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* "mmap error."
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*/
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#define __LIBRARY__
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "new.h"
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_syscall2(int,munmap,void *,addr,size_t,length)
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void *mmap(void *addr, size_t length, ...)
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{
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register int res;
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va_list arg;
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va_start(arg,length);
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__asm__("int $0x80"
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:"=a" (res)
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:"0" (__NR_open),"b" (addr),"c" (length),
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"d" (va_arg(arg,int)));
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if (res>=0)
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return (void *)res;
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errno = -res;
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return (void *)-1;
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}
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static struct stat kst;
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void test_mmap(void){
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char *array;
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const char *str = " Hello, mmap success.";
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int fd;
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fd = open("test_mmap.txt", O_RDWR | O_CREAT, S_IRUSR|S_IWUSR);
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write(fd, str, strlen(str));
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fstat(fd, &kst);
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printf("file len: %d\n", (int)kst.st_size);
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array = mmap(NULL, kst.st_size, PROT_WRITE | PROT_READ, MAP_FILE | MAP_SHARED, fd, 0);
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printf("mmap addr: %x\n", (unsigned int)array);
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if (array == MAP_FAILED) {
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printf("mmap error.\n");
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}else{
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printf("mmap content: %s\n", array);
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munmap(array, kst.st_size);
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}
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close(fd);
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}
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int main(void){
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test_mmap();
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return 0;
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}
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