dup2 stdin
You are piping the wrong data to the child process. I am assuming var_a and var_b are the strings you want to send to program A. They are both of type array of chars, which in C is the same thing as pointer to char (Actually there is a small difference b,int stdinHolder = dup(0); int stdoutHolder = dup(1); close(0); close(1);. Then after you are done you can dup back to the holders of stdin and stdout. int stdinHolder = dup(1); int stdoutHolder = dup(0); close(0); close(1);.
| 相關軟體 Processing 資訊 | |
|---|---|
 dup2 stdin 相關參考資料
c - read() write() into pipe() via dup2() with stdin and stdout - Stack ...
This looks like homework, so I'll give you a way to approach the problem: Get it working with one calendar, reading in one line at a time and writing to stdout. Now store each line in an array of ... https://stackoverflow.com c - using dup2 and pipe to redirect stdin - Stack Overflow
You are piping the wrong data to the child process. I am assuming var_a and var_b are the strings you want to send to program A. They are both of type array of chars, which in C is the same thing as ... https://stackoverflow.com c - Using Dup2 to Redirect Input and Output - Stack Overflow
int stdinHolder = dup(0); int stdoutHolder = dup(1); close(0); close(1);. Then after you are done you can dup back to the holders of stdin and stdout. int stdinHolder = dup(1); int stdoutHolder = dup(... https://stackoverflow.com C Pipe to STDIN of Another Program - Stack Overflow
I suppose this is what you're going to do: 1. main fork, parent pass message to child via pipe. 2. child receive message from pipe, redirect message to STDIN, execute log. 3. log receive message ... https://stackoverflow.com C restore stdout to terminal - Stack Overflow
#include <unistd.h> ... int saved_stdout; ... /* Save current stdout for use later */ saved_stdout = dup(1); dup2(my_temporary_stdout_fd, 1); ... do some work on your new stdout ... /* Restore ... https://stackoverflow.com dup2() and stdin redirection - Linux Forums
Alright, so up front, I'm obviously taking an operating systems class and writing my own shell. My question is simple. If I have an open file descriptor, say, fd, I know how to execute the dup2 c... http://www.linuxforums.org Redirect stdout of two processes to another process's stdin in ...
Rule of thumb: if you connect one end of a pipe to standard input or standard output via dup2() (or dup() ), you should close both of the file descriptors returned by pipe() . Try this code for size.... https://stackoverflow.com Using dup2 for Redirection and Pipes - CS 702 - Operating Systems ...
... write part of 1st pipe dup2(pipes[1], 1); // close all pipes (very important!); end we're using was safely copied close(pipes[0]); close(pipes[1]); close(pipes[2]); close(pipes[3]); execvp(*ca... http://www.cs.loyola.edu |