[C] LINUX C ±à³Ìdup2ÎÊÌâ
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
void get_cal(const char *arg)
{
char cmd[64];
strcpy(cmd, arg);
int pfds[2],bak_stdout;
if(pipe(pfds)==0)
{
printf("2\n");
printf("fd_11 is %d\n",pfds[1]);
printf("2.1\n");
bak_stdout=dup(1);
printf("2.1.1\n");
// close(1);
printf("2.1.1.1\n");
dup2( pfds[1], 1);
close(pfds[0]);
printf("1.2\n");
system(cmd);
close(pfds[1]);
dup2(bak_stdout,1);
}
else
printf("pipe open error!\n");
}
void read_cal(char *data)
{
char cmd[64], line[199];
*data = 0;
int pfds[2];
if(pipe(pfds)==0)
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#include <stdio.h>
int main()
{
char x, y, z;
int i;
int a[16];
for(i=0; i<=16; i++)
{
a[i] = 0;
......
#include"stdio.h"
#include"stdlib.h"
void ContrTwo(char i)
{
char str1[8];
itoa(i,str1,2);
printf("%s",str1);
}
unsigned char leftRot(char str,int i);
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