DNSServiceBrowse(3DNDNSDService Discovery Library FunDNSServiceBrowse(3DNS_SD)NAMEDNSServiceBrowse - browse service instances with DNS
SYNOPSIS
cc [ flag ... ] file ... -ldns_sd [ library ... ]
#include <dns_sd.h>
DNSServiceErrorType DNSServiceBrowse(DNSServiceRef *sdRef,
DNSServiceFlags flags, uint32_t interfaceIndex,
const char *regtype, const char *domain,
DNSServiceServiceBrowseReply callBack, void *context);
typedef void(*DNSServiceBrowseReply)(DNSServiceRef sdRef,
DNSServiceFlags flags, uint32_t interfaceIndex,
DNSServiceErrorType errorCode, const char *serviceName,
const char *regtype, const char *replyDomain,
void *context);
DESCRIPTION
The DNSServiceBrowse() function is used to browse for service instances
of a particular service and protocol type. The sdRef argument points to
an uninitialized DNSServiceRef. If the call to DNSServiceBrowse suc‐
ceeds sdRef is initialized. The flags argument to DNSServiceBrowse() is
currently unused and reserved for future use. A nonzero value to inter‐
faceIndex indicates DNSServiceBrowse() should do a browse on all inter‐
faces. Most applications will use an interfaceIndex value of 0 to per‐
form a browse on all interfaces. See the section "Constants for speci‐
fying an interface index" in <dns_sd.h> for more details.
The callback function is invoked for every service instance found
matching the service type and protocol. The callback argument points to
a function of type DNSServiceBrowseReply listed above. The DNSService‐
Browse() call returns browse results asynchronously. The service browse
call can be terminated by applications with a call to DNSSer‐
viceRefDeallocate().
The regtype parameter is used to specify the service type and protocol
(e.g. _ftp._tcp). The protocol type must be TCP or UDP. The domain
argument to DNSServiceBrowse() specifies the domain on which to browse
for services. Most applications will not specify a domain and will per‐
form a browse on the default domain(s). The context argument can be
NULL and points to a value passed to the callback function.
The sdRef argument passed to the callback function is initialized by
DNSServiceBrowse() call. The possible values passed to flags in the
callback function are: kDNSServiceFlagsMoreComing and kDNSService‐
FlagsAdd. The kDNSServiceFlagsMoreComing value indicates to a callback
that at least one more result is immediately available. The kDNSSer‐
viceFlagsAdd value indicates that a service instance was found. The
errorCode argument will be kDNSServiceErr_NoError on success. Other‐
wise, failure is indicated. The discovered service name is returned to
the callback via the serviceName argument. The regtype argument in the
callback holds the service type of the found service instance. The dis‐
covered service type can be different from the requested service type
in the browse request when the discovered service type has subtypes.
The domain argument to the callback holds the domain name of the dis‐
covered service instance. The service type and the domain name must be
stored and passed along with the service name to resolve a service
instance using DNSServiceResolve().
RETURN VALUES
The DNSServiceBrowse function returns kDNSServiceErr_NoError on suc‐
cess. Otherwise, an error code defined in <dns_sd.h> is returned to
indicate an error has occurred. When an error is returned by DNSSer‐
viceBrowse, the callback function is not invoked and the DNSServiceRef
argument is not initialized.
ATTRIBUTES
See attributes(5) for description of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSODNSServiceRefDeallocate(3DNS_SD), DNSServiceResolve(3DNS_SD),
attributes(5)SunOS 5.11 20 Aug 2007 DNSServiceBrowse(3DNS_SD)