107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
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#include <sys/types.h>
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#include <errno.h>
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#include <grp.h>
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#include <nss.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#define MODULE "db"
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#define NUMTHREADS 512
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static pthread_rwlock_t startlock, outlock;
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static int
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compare_gid(const void *a, const void *b)
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{
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gid_t ga, gb;
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long la, lb;
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ga = *(gid_t *) a;
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gb = *(gid_t *) b;
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la = ga;
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lb = gb;
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return (int)(la - lb);
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}
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static void *
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thread_main(void *arg)
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{
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gid_t *groups;
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int result, n_groups, i;
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pthread_rwlock_rdlock(&startlock);
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n_groups = 32;
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groups = malloc(sizeof(groups[0]) * n_groups);
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if (groups != NULL) {
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do {
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result = getgrouplist((const char *)arg, 0,
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groups, &n_groups);
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if ((result == -1) && (errno == ERANGE)) {
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n_groups += 2;
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free(groups);
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groups = malloc(sizeof(groups[0]) * n_groups);
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}
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} while ((result == -1) && (errno == ERANGE));
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}
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if (result >= 0) {
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qsort(groups, n_groups, sizeof(groups[0]), &compare_gid);
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pthread_rwlock_wrlock(&outlock);
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for (i = 0; i < n_groups; i++) {
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if (i > 0) {
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printf(":");
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}
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printf("%lu", (unsigned long)groups[i]);
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}
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printf("\n");
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pthread_rwlock_unlock(&outlock);
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} else {
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result = errno;
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pthread_rwlock_wrlock(&outlock);
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printf("%s: %s\n", (const char *)arg, strerror(result));
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pthread_rwlock_unlock(&outlock);
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}
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return NULL;
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}
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int
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main(int argc, char **argv)
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{
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unsigned int i, j;
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char *guser;
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pthread_t tids[NUMTHREADS];
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__nss_configure_lookup("group", MODULE);
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guser = argc > 1 ? argv[1] : "root";
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if (pthread_rwlock_init(&startlock, NULL) != 0) {
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fprintf(stderr, "pthread_rwlock_init: %s\n", strerror(errno));
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return 1;
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}
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pthread_rwlock_wrlock(&startlock);
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if (pthread_rwlock_init(&outlock, NULL) != 0) {
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fprintf(stderr, "pthread_rwlock_init: %s\n", strerror(errno));
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return 1;
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}
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for (i = 0; i < sizeof(tids) / sizeof(tids[0]); i++) {
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if (pthread_create(&tids[i], NULL, &thread_main, guser) != 0) {
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break;
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}
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}
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if (i < sizeof(tids) / sizeof(tids[0])) {
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fprintf(stderr, "error starting thread #%d, continuing\n", i);
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}
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pthread_rwlock_unlock(&startlock);
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for (j = 0; j < i; j++) {
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pthread_join(tids[j], NULL);
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}
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return 0;
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}
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