pararun: run jobs in parallel (fork)

by darkgeem 2 years ago

GNU/Linux • xterm-256color • fish 232 views

here’s the source code for pararun:

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Lmg+CgojZGVmaW5lIFBBUkFSVU5fTkFNRSBhcmd2WzBdCiNkZWZpbmUgRVhFQ1VUQUJMRSBhcmd2
WzFdCgppbnQgbWFpbihpbnQgYXJnYywgY2hhcioqIGFyZ3YpIHsKCWlmIChhcmdjIDwgMikgewoJ
CXByaW50ZigiVXNhZ2U6ICVzIC4vZXhlY3V0YWJsZSBmaWxlMSBmaWxlMiBmaWxlM1xuIiwgUEFS
QVJVTl9OQU1FKTsKCQlyZXR1cm4gMTsKCX0KCWlmIChhcmdjIDwgMykgewoJCXByaW50ZigiVXNh
Z2U6ICVzICVzIGZpbGUxIGZpbGUyIGZpbGUzXG4iLCBQQVJBUlVOX05BTUUsIEVYRUNVVEFCTEUp
OwoJCXJldHVybiAxOwoJfQoJZm9yIChpbnQgaSA9IDI7IGkgPCBhcmdjOyBpICs9IDEpIHsKCQlp
ZiAoZm9yaygpID09IDApIHsKCQkJZXhlY2xwKEVYRUNVVEFCTEUsIEVYRUNVVEFCTEUsIGFyZ3Zb
aV0sIE5VTEwpOwoJCQlicmVhazsKCQl9Cgl9CgoJZm9yIChpbnQgaSA9IDI7IGkgPCBhcmdjOyBp
ICs9IDEpIHsKCQl3YWl0KE5VTEwpOwoJfQoKCXJldHVybiAwOwp9Cg==

and the non-base64 version:

#include <unistd.h>
#include <stdio.h>
#include <sys/wait.h>

#define PARARUN_NAME argv[0]
#define EXECUTABLE argv[1]

int main(int argc, char** argv) {
    if (argc < 2) {
        printf("Usage: %s ./executable file1 file2 file3\n", PARARUN_NAME);
        return 1;
    }
    if (argc < 3) {
        printf("Usage: %s %s file1 file2 file3\n", PARARUN_NAME, EXECUTABLE);
        return 1;
    }
    for (int i = 2; i < argc; i += 1) {
        if (fork() == 0) {
            execlp(EXECUTABLE, EXECUTABLE, argv[i], NULL);
            break;
        }
    }

    for (int i = 2; i < argc; i += 1) {
        wait(NULL);
    }

    return 0;
}

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https://asciinema.org/a/573798

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