execvp - w3toppers.com

How to use execvp()

The first argument is the file you wish to execute, and the second argument is an array of null-terminated strings that represent the appropriate arguments to the file as specified in the man page. For example: char *cmd = “ls”; char *argv[3]; argv[0] = “ls”; argv[1] = “-la”; argv[2] = NULL; execvp(cmd, argv); //This will … Read more

Classic C. Using pipes in execvp function, stdin and stdout redirection

You need to close the pipe fds in the parent, or the child won’t receive EOF, because the pipe’s still open for writing in the parent. This would cause the second wait() to hang. Works for me: #include <unistd.h> #include <stdlib.h> int main(int argc, char** argv) { int des_p[2]; if(pipe(des_p) == -1) { perror(“Pipe failed”); … Read more