#define STR "xiamanman\n"
#define STR_LEN 10
#define STDOUT 1
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main()
{
int fd = open("./temp", O_CREAT|O_RDWR|O_APPEND);
int s_fd = dup(STDOUT);
dup2(fd, STDOUT);
close(fd);
write(STDOUT, STR, STR_LEN);
dup2(s_fd, STDOUT);
close(s_fd);
write(STDOUT, STR, STR_LEN);
printf("xx\n");
return 0;
}
--------------------------------------------------------------------
参考资料，dup2 百度百科。主要参考英文的代码。
#define STDOUT 1
int main(void)
{
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;
}