freebsd_getprocs_sysctl.c

#### NOTE, this was generated with Claude 3.5 sonnet.

#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

char* get_proc_args(pid_t pid) {
    int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_ARGS, pid};
    static char args[ARG_MAX];
    size_t size = ARG_MAX;

    if (sysctl(mib, 4, args, &size, NULL, 0) == -1) {
        return NULL;
    }

    return args;
}

int main() {
    int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PROC, 0};
    size_t size;
    struct kinfo_proc *proc;
    int count, i;

    // Get the size of the buffer needed
    if (sysctl(mib, 4, NULL, &size, NULL, 0) < 0) {
        perror("sysctl");
        exit(1);
    }

    // Allocate memory for the process information
    proc = malloc(size);
    if (!proc) {
        perror("malloc");
        exit(1);
    }

    // Get the actual process information
    if (sysctl(mib, 4, proc, &size, NULL, 0) < 0) {
        perror("sysctl");
        free(proc);
        exit(1);
    }

    // Calculate the number of processes
    count = size / sizeof(struct kinfo_proc);

    // Print process information
    for (i = 0; i < count; i++) {
        printf("PID: %d, Name (ki_comm): %.19s", proc[i].ki_pid, proc[i].ki_comm);

        // Get full command line
        char *args = get_proc_args(proc[i].ki_pid);
        if (args != NULL) {
            printf(", Command: %s", args);
        }
        printf("\n");
    }

    free(proc);
    return 0;
}