Esse script lista os processos via /proc/.

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#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <pwd.h>
#include <assert.h>
#define PROC "/proc/"

/* ************************************ *
 * Get PIDs and cmdline from /proc/ *
 * Ter Fev 10 18:38:31 BRST 2015    *
 * Author: MMxM | hc0der.blogspot.com   *
 * ************************************ */


void *xmalloc(size_t len);
void safefree(void **ptr);
void die(const char *err);
int cmdline_info(const char *cmd);
void status_info(const char *path, size_t len);

void die(const char *err){
    (errno) ? perror(err) : fprintf(stderr,"%s\n",err);
    exit(1);
}

void *xmalloc(size_t len){
    void *ptr = malloc(len);
    if(ptr == NULL)
        die("malloc error");
    return ptr;
}

void xfree(void **ptr){
    assert(ptr);
    if(ptr != NULL){
        free(*ptr);
        *ptr = NULL;
    }
}

int cmdline_info(const char *cmd){
    FILE *fp = NULL;
    char C = 0;
    size_t x = 0;


    if( (fp = fopen(cmd,"r")) == NULL)
        return 0;

    while( (C = fgetc(fp)) != EOF )
        x += printf("%c",C);

    fclose(fp);

    return x;
}

void status_info(const char *path, size_t len){
    char *status_file = NULL, C = 0;
    FILE *fp = NULL;

    status_file = strncpy( xmalloc( (len+6) * sizeof(char) ), path, len);
    strncat(status_file, "status", 6);

    if( (fp = fopen(status_file, "r")) != NULL){
        fseek(fp, 6, SEEK_SET);
        while( (C = fgetc(fp)) != '\n')
            printf("%c",C);

        fclose(fp);
    }

    xfree((void **)&status_file);

}

int main(void){
    DIR *dip;
    struct dirent *dit;
    struct stat owner;
    struct passwd *pd;
    int pid_nb = 0;

    char *file = NULL, *cmdline = NULL;
    size_t alloc_size = 0;

    if( (dip=opendir(PROC)) == NULL )
        die("opendir() error");


    printf("USER\tPID\tCOMMAND\n");

    while ( (dit = readdir(dip) ) != NULL ){
        if(dit->d_type != 4)
            continue;

        pid_nb = (int) strtol(dit->d_name, NULL, 10);

        if(pid_nb == 0)
            continue;

        alloc_size = 6+strlen(dit->d_name)+2;

        file = xmalloc( alloc_size * sizeof(char));
        snprintf(file, alloc_size, "%s%s/",PROC,dit->d_name);

        if(stat(file, &owner) == -1){
            xfree((void **)&file);
            continue;
        }

        if((pd = getpwuid(owner.st_uid)) == NULL){
            xfree((void **)&file);
            continue;
        }

        printf("%s\t",pd->pw_name);
        printf("%s\t",dit->d_name);

        cmdline = strncpy( xmalloc( alloc_size + 7 ) , file , alloc_size );
        strncat(cmdline,"cmdline",7);

        if(!cmdline_info(cmdline)){
            printf("[");
            status_info(file, alloc_size);
            printf("]");
        }

        printf("\n");

        xfree((void **)&cmdline);
        xfree((void **)&file);
    }

    closedir(dip);

    return 0;

}

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