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I am trying to exec a python program from another C program where the return value of the py script is

int array[3]

can I grab the this array from the python exit code ??

EDIT: if the question is not clear can I make the return code of python script an array of integers instead of int ?? and catch it from C process ??

What I want to achieve?? I am working on a robot , a Raspberry PI with 3 sensors. The RPi is running arch linux, the C program is the navigator that takes input from a python script that get data from sensors, I am wondering how to get the data ??

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Your question is not clear. the return value from a program on common OSs is an integer. – Elazar 18 hours ago
ok can I make it an array of integers ?? – Ahmed Kato 18 hours ago
Nope. you can try to decode somehow, if the numbers are small, but no. you should use some other form of comunication - I'd say standard output. – Elazar 18 hours ago
Please give some more information about what and why are you trying to achieve. And on which OS. By the way: There is no such thing like "C process" or "Python proces". only "process". – Elazar 18 hours ago
Ok please check the last edit. – Ahmed Kato 18 hours ago

2 Answers

up vote 0 down vote

No. The exit code of a process is a single integer, from 0 to 255. It cannot be an array, nor can it be outside that range.

If you want to return data from a C program to its caller, print it on standard output (e.g, printf()). The exit status can only convey very basic information, like success/failure.

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up vote 0 down vote

You can't use the exit code for this. However, you can use standard input/output:

p.py:

print 1, 2, 3

temp.c:

#include <stdio.h>

int main() {
    int array[3];
    scanf("%d%d%d", &array[0], &array[1], &array[2]);
}

run:

$ gcc temp.c
$ python p.py | ./a.out
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