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Get a network host entry by name
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
struct hostent *gethostbyname_r(
const char * name,
struct hostent * result,
char * buffer,
int bufflen,
int * h_errnop );
- name
- The name of the Internet host whose entry you want to find.
- result
- A pointer to a struct hostent where the function can
store the host entry.
- buffer
- A pointer to a buffer that the function can use during the operation
to store host database entries; buffer should be large enough to
hold all of the data associated with the host entry.
A 2K buffer is usually more than enough; a 256-byte buffer is safe in most
cases.
- buflen
- The length of the area pointed to by buffer.
- h_errnop
- A pointer to a location where the function can store an
herrno
value if an error occurs.
libsocket
Use the -l socket option to
qcc
to link against this library.
The gethostbyname_r() function is a thread-safe version of
gethostbyname().
This function gets the network host entry for the host specified by
name, and stores the entry in the struct hostent
pointed to by result.
A pointer to result, or NULL if an error occurs.
If an error occurs, the int pointed to by h_errnop
is set to:
- ERANGE
- The supplied buffer isn't large enough to store the result.
- HOST_NOT_FOUND
- Authoritative answer: Unknown host.
- NO_ADDRESS
- No address associated with name; look for an MX record.
- NO_DATA
- Valid name, but no data record of the requested type.
The name is known to the name server, but has no IP
address associated with it—this isn't a temporary
error. Another type of request to the name server using this
domain name will result in an answer (e.g. a
mail-forwarder may be registered for this domain).
- NO_RECOVERY
- Unknown server error. An unexpected server failure was encountered.
This is a nonrecoverable network error.
- TRY_AGAIN
- Nonauthoritative answer: Host name lookup failure.
This is usually a temporary error and means that the
local server didn't receive a response from an authoritative
server. A retry at some later time may succeed.
- /etc/hosts
- Local host database file.
- /etc/nsswitch.conf
- Name-service switch configuration file.
For information about these files, see the Utilities Reference.
Unix
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
gethostbyaddr(),
gethostbyaddr_r(),
gethostbyname()
/etc/hosts,
/etc/nsswitch.conf
in the Utilities Reference
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