1c274b738e
still some problems, at least with signal handling and locking on SMP. Submitted by: dick
106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
#include "pthread.h"
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#include <netdb.h>
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#include <string.h>
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static pthread_mutex_t getnetby_mutex = PTHREAD_MUTEX_INITIALIZER;
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static int
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convert (struct netent *ret, struct netent *result,
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char *buf, int buflen)
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{
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int len, i;
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if (!buf) return -1;
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*result = *ret;
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result->n_name = (char *) buf;
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/* This is the size. */
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len = strlen (ret->n_name) + 1;
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if (len > buflen) return -1;
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buflen -= len;
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buf += len;
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strcpy (result->n_name, ret->n_name);
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/* How many aliases and how big the buffer should be? There
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is always a NULL pointer. */
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for (len = sizeof (char *), i = 0; ret->n_aliases [i]; i++)
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{
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/* It should be size of (char *) and the length of string
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plus 1. */
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len += strlen (ret->n_aliases [i]) + 1 + sizeof (char *);
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}
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if (len > buflen) return -1;
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/* This is an array of char * for n_aliases. */
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result->n_aliases = (char **) buf;
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buf += (i + 1) * sizeof (char *);
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/* We copy the aliases now. */
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for (i = 0; ret->n_aliases [i]; i++)
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{
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result->n_aliases [i] = (char *) buf;
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strcpy (result->n_aliases [i], ret->n_aliases [i]);
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buf += strlen (ret->n_aliases [i]) + 1;
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}
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/* This is the last one */
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result->n_aliases [i] = NULL;
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return 0;
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}
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struct netent *
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getnetbyaddr_r (long net, int type,
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struct netent *result, char *buffer, int buflen)
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{
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struct netent *ret;
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pthread_mutex_lock (&getnetby_mutex);
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ret = getnetbyaddr (net, type);
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if (!ret ||
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convert (ret, result, buffer, buflen) != 0)
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{
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result = NULL;
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}
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pthread_mutex_unlock (&getnetby_mutex);
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return result;
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}
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struct netent *
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getnetbyname_r (const char *name,
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struct netent *result, char *buffer, int buflen)
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{
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struct netent *ret;
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pthread_mutex_lock (&getnetby_mutex);
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ret = getnetbyname (name);
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if (!ret ||
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convert (ret, result, buffer, buflen) != 0)
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{
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result = NULL;
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}
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pthread_mutex_unlock (&getnetby_mutex);
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return result;
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}
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struct netent *
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getnetent_r (struct netent *result, char *buffer, int buflen)
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{
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struct netent *ret;
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pthread_mutex_lock (&getnetby_mutex);
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ret = getnetent ();
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if (!ret ||
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convert (ret, result, buffer, buflen) != 0)
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{
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result = NULL;
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}
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pthread_mutex_unlock (&getnetby_mutex);
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return result;
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}
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