在linux下,关闭stdin,stdout,stderr后重新打开的方法:先用dup2(...)函数复制stdin,stdout,stderr文件描述符,然后复制回去。代码示例:
#include <stdio.h> #include <unistd.h>
int main(int argc, char* argv[]) { //this integer variable must be a value between 0 to 255
int fd = 100;
dup2( 1, fd ); printf("copy 1 to fd\n");
//close standard output close(1); printf("close 1\n");
//reopen standard output dup2(fd, 1); printf("cope fd to 1\n"); return 0; }
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输出结果:
copy 1 to fd
copy fd to 1
因为标准输出被close所以close 1没有被输出。
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