This is an archived page. It's not actively maintained.

Looks up a host entry by its network address.


#include <prnetdb.h>

PRStatus PR_GetHostByAddr(
  const PRNetAddr *hostaddr,
  char *buf,
  PRIntn bufsize,
  PRHostEnt *hostentry);


The function has the following parameters:

A pointer to the IP address of host in question.
A pointer to a buffer, allocated by the caller, that is filled in with host data on output. All of the pointers in the hostentry structure point to data saved in this buffer. This buffer is referenced by the runtime during a call to PR_EnumerateHostEnt.
Number of bytes in the buf parameter. The buffer must be at least PR_NETDB_BUF_SIZE bytes.
This structure is allocated by the caller. On output, this structure is filled in by the runtime if the function returns PR_SUCCESS.


The function returns one of the following values:

  • If successful, PR_SUCCESS.
  • If unsuccessful, PR_FAILURE. You can retrieve the reason for the failure by calling PR_GetError.


PR_GetHostByAddr is used to perform reverse lookups of network addresses. That is, given a valid network address (of type PRNetAddr), PR_GetHostByAddr discovers the address' primary name, any aliases, and any other network addresses for the same host.