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https://github.com/riba2534/TCP-IP-NetworkNote.git
synced 2026-02-02 17:48:55 +08:00
24 lines
630 B
C
24 lines
630 B
C
#include <stdio.h>
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#include <unistd.h>
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int main(int argc, char *argv[])
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{
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int cfd1, cfd2;
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char str1[] = "Hi~ \n";
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char str2[] = "It's nice day~ \n";
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cfd1 = dup(1); //复制文件描述符 1
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cfd2 = dup2(cfd1, 7); //再次复制文件描述符,定为数值 7
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printf("fd1=%d , fd2=%d \n", cfd1, cfd2);
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write(cfd1, str1, sizeof(str1));
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write(cfd2, str2, sizeof(str2));
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close(cfd1);
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close(cfd2); //终止复制的文件描述符，但是仍有一个文件描述符
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write(1, str1, sizeof(str1));
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close(1);
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write(1, str2, sizeof(str2)); //无法完成输出
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return 0;
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}
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