| 词条 | dup2 |
| 释义 | § 解释 函数名: dup2 功 能: 复制文件句柄 用 法: int dup2(int oldhandle, int newhandle); § 程序例 #include <sys\\stat.h> #include <string.h> #include <fcntl.h> #include <io.h> int main(void) { #define STDOUT 1 int nul, oldstdout; char msg【】 = "This is a test"; /* create a file */ nul = open("DUMMY.FIL", O_CREAT | O_RDWR, S_IREAD | S_IWRITE); /* create a duplicate handle for standard output */ oldstdout = dup(STDOUT); /* redirect standard output to DUMMY.FIL by duplicating the file handle onto the file handle for standard output. */ dup2(nul, STDOUT); /* close the handle for DUMMY.FIL */ close(nul); /* will be redirected into DUMMY.FIL */ write(STDOUT, msg, strlen(msg)); /* restore original standard output handle */ dup2(oldstdout, STDOUT); /* close duplicate handle for STDOUT */ close(oldstdout); return 0; } |
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