Yes, unless you need the program you exec to have access to that file descriptor. You can also close the file descriptor manually in the child process before calling exec, but that’s more error prone.
No. From the man pages: execve() does not return on success, and the text, data, bss, and stack of the calling process are overwritten by that of the program loaded. The program invoked inherits the calling process’s PID, and any open file descriptors that are not set to close on exec. Signals pending on the … Read more
See if this works (sorry can’t test it right now) Runtime.getRuntime().exec(new String[]{“php”,”/var/www/script.php”, “-m”, “2”});
I am completely against this use of __code__. Although I am a curious person, and this is what someone theoretically could do: code # This is your code object that you want to execute def new_func(eggs): pass new_func.__code__ = code new_func(‘eggs’) Again, I never want to see this used, ever. You might want to look … Read more
Here’s a simple, readable solution: pid_t parent = getpid(); pid_t pid = fork(); if (pid == -1) { // error, failed to fork() } else if (pid > 0) { int status; waitpid(pid, &status, 0); } else { // we are the child execve(…); _exit(EXIT_FAILURE); // exec never returns } The child can use the … Read more
In order to be able to use a pipe, you need to execute a shell command, i.e. the command with the pipeline has to be a single command for -exec. find /path/to/dir -type f -print -exec sh -c “cat {} | head -1 | grep yourstring” \; Note that the above is a Useless Use … Read more
After lots of trying different things, I finally had a look at what “npm” actually is on windows, and it turns out to be a bash script called npm, as well as a windows-native batch script called npm.cmd (no idea why it’s .cmd, that should be .bat, but there you have it). Windows’s command resolver … Read more
You have to create a pipe from the parent process to the child, using pipe(). Then you must redirect standard ouput (STDOUT_FILENO) and error output (STDERR_FILENO) using dup or dup2 to the pipe, and in the parent process, read from the pipe. It should work. #include <stdio.h> #include <stdlib.h> #include <unistd.h> #define die(e) do { … Read more
There is no ready-made way or tutorial on how to do create an EXE from a program using the PyPy interpreter, as far as i know. And it’s not exactly trivial to get things going, i am afraid. In principle, there are two ways to consider for using PyPy’s translations to get a EXE file, … Read more