trusty (3) pmDiscoverServices.3.gz

NAME

       pmDiscoverServices - discover PCP services on the network

C SYNOPSIS

       #include <pcp/pmapi.h>

       int pmDiscoverServices(const char *service, const char *mechanism, char ***urls);

       cc ... -lpcp

DESCRIPTION

       Given  a PCP service name, as identified by service, and using the type of discovery optionally specified
       in mechanism, pmDiscoverServices returns, via urls, a list of URLs representing the  services  discovered
       on the network.

       service  specifies the PCP service to be discovered. Currently, only PM_SERVER_SERVICE_SPEC is supported,
       which searches for pmcd(1) servers.

       mechanism specifies the style of discovery to  be  used.  Currently,  only  "avahi"  is  supported.  This
       searches for services which are broadcasting using mDNS via avahi-daemon(8).  mechanism may also be NULL,
       which means to use all available discovery mechanisms.

       Normally, pmDiscoverServices will return the number of services discovered, else a value less  than  zero
       for an error.  The value zero indicates that no services were discovered.

       The  resulting  list  of  pointers, urls, and the values (the URLs) that the pointers reference will have
       been allocated by pmDiscoverServices with a single call to malloc(3C), and it is  the  responsibility  of
       the pmDiscoverServices caller to free(urls) to release the space when it is no longer required.

       When  an  error  occurs,  or  no  services  are  discovered,  urls  is undefined (no space will have been
       allocated, and so calling free(3C) is a singularly bad idea).

PCP ENVIRONMENT

       Environment variables with the prefix PCP_ are used to parameterize the file and directory names used  by
       PCP.   On  each  installation, the file /etc/pcp.conf contains the local values for these variables.  The
       $PCP_CONF variable may be used to specify an alternative configuration file, as described in pcp.conf(5).
       Values for these variables may be obtained programmatically using the pmGetConfig(3) function.

SEE ALSO

       PMAPI(3), pmcd(1), pmfind(1), pmGetConfig(3), pcp.conf(5), pcp.env(5) and avahi-daemon(8).

DIAGNOSTICS

       EOPNOTSUPP
              The specified mechanism is not supported.