[WIP] send to stdin per PID

e.g. send to a program’s stdin via its PID.

echotest.c

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#include <stdio.h>

int main(){
    char buffer[1000];
    while (1){
        scanf("%s", buffer);
        printf("%s\n", buffer);
    }

    return 0;
}

Comiple and run the test. To send iostream to this program from elsewhere (e.g. another terminal):

echo something > /proc/<PID>/fd/0

Don’t try to read from program’s stdout/err (e.g. cat /proc/<PID>/fd/{1,2}), because the buffer could be consumed by other “listeners” and results will be inconsistent.

not so easy! [WIP]

https://serverfault.com/a/962956

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