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/*
*
* Author: gplll <gplll1818@gmail.com>, Oct 2014
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/types.h>
#include <pwd.h>
#include <pthread.h>
static int stress = 0;
static int verbose = 0;
static int num_threads = 2;
static char *user = NULL;
static uid_t uid = 0xffffffff;
void get_options (int argc, char *argv[])
{
int opt;
while ((opt = getopt(argc, argv, "hsp:u:i:v")) != -1) {
switch (opt) {
case 's':
stress = 1;
break;
case 'p':
num_threads = atoi (optarg);
break;
case 'u':
user = optarg;
break;
case 'i':
uid = (uid_t) (atoi (optarg));
break;
case 'v':
verbose = 1;
break;
case 'h':
default: /* '?' */
fprintf(stderr, "Usage: %s [-s] [-p parallelism] [-v] [-u user] [-i uid]\n", argv[0]);
fprintf(stderr, " -s: run multithreaded stress test\n");
fprintf(stderr, " -p: specify number of threads for stress test (default is 2)\n");
fprintf(stderr, " -v: verbose during multithreaded stress test\n");
fprintf(stderr, " -u: get user from name\n");
fprintf(stderr, " -i: get user from uid\n");
fprintf(stderr, " -h: display usage\n");
exit(0);
}
}
}
void* getpw (void* arg) {
struct passwd *pwd;
uint mypid = (uint) pthread_self();
int num_loops = 0;
int num_entries = 0;
while (1) {
num_loops++;
num_entries = 0;
setpwent ();
if (verbose)
printf ("thread id = %u, loop# = %d, setpwent() called\n", mypid, num_loops);
while (1) {
pwd = getpwent();
if (verbose)
printf ("thread id = %u, loop# = %d, entries read = %d\n", mypid, num_loops, num_entries);
if (pwd == NULL) {
break;
}
num_entries++;
}
printf ("thread id = %u, loop# = %d, endpwent() called, entries read = %d\n", mypid, num_loops, num_entries);
endpwent ();
}
return NULL;
}
int main(int argc, char *argv[]) {
struct passwd *pwd;
int i;
get_options(argc, argv);
if (stress == 1) {
pthread_t thread;
for (i = 0; i < num_threads; i++) {
pthread_create (&thread, NULL, &getpw, NULL);
}
pthread_join (thread, NULL);
}
if (user != NULL) {
pwd = getpwnam (user);
if (pwd == NULL) {
printf ("user %s not found\n", user);
}
else {
printf ("user=%s, uid=%u, gid=%u\n", pwd->pw_name, pwd->pw_uid, pwd->pw_gid);
}
exit (0);
}
if (uid != 0xffffffff) {
pwd = getpwuid (uid);
if (pwd == NULL) {
printf ("userid %u not found\n", uid);
}
else {
printf ("user=%s, uid=%u, gid=%u\n", pwd->pw_name, pwd->pw_uid, pwd->pw_gid);
}
exit (0);
}
else {
setpwent ();
while (1) {
pwd = getpwent();
if (pwd == NULL) {
exit (0);
}
printf ("user=%s, uid=%u, gid=%u\n", pwd->pw_name, pwd->pw_uid, pwd->pw_gid);
}
}
return (0);
}
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