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CentOS 7.0 - man page for __pmunparsehostspec (centos section 3)

PMPARSEHOSTSPEC(3)			       Library Functions Manual 			   PMPARSEHOSTSPEC(3)

__pmParseHostSpec, __pmUnparseHostSpec, __pmFreeHostSpec - uniform host specification parser
#include <pcp/pmapi.h> #include <pcp/impl.h> int __pmParseHostSpec(const char *string, pmHostSpec **hostsp, int *count, char **errmsg); int __pmUnparseHostSpec(pmHostSpec *hosts, int count, char *string, size_t size); void __pmFreeHostSpec(pmHostSpec *hosts, int count); cc ... -lpcp
__pmParseHostSpec accepts a string specifying the location of a PCP performance metric collector daemon. The syntax of the various formats of this string is described in PCPIntro(1) where several examples are also pre- sented. The syntax allows the initial pmcd(1) hostname to be optionally followed by a list of port numbers, which will be tried in order when connecting to pmcd on that host. The portlist is separated from the hostname using a colon, and each port in the list is comma-separated. In addition, one or more optional pmproxy(1) hosts can be specified (currently, only one proxy host is sup- ported by the PCP protocols). These are separated from each other and from the pmcd component using the @ character. These may also be followed by an optional port list, using the same comma-separated syntax as be- fore. __pmParseHostSpec takes a null-terminated host specification string and returns an array of pmHostSpec struc- tures, where the array has count entries. These pmHostSpec structures that are returned via hostsp represent each individual host in the specification string and has the following declaration: typedef struct { char *name; /* hostname (always valid) */ int *ports; /* array of host port numbers */ int nports; /* number of ports in host port array */ } pmHostSpec; __pmUnparseHostSpec performs the inverse operation, creating a string representation from a number of hosts structures. Where the count of structures indicated by hosts is greater than one, the proxy syntax is used to indicate a chain of proxied hosts. The size of the supplied string buffer must be provided by the caller us- ing the size parameter.
If the given string is successfully parsed __pmParseHostSpec returns zero. In this case the dynamic storage allocated by __pmParseHostSpec can be released by calling __pmFreeHostSpec using the address returned from __pmParseHostSpec via hosts. __pmParseHostSpec returns PM_ERR_GENERIC and a dynamically allocated error message string in errmsg, if the given string does not parse, and the user-supplied errmsg pointer is non-null. Be sure to free(3C) the error message string in this situation. In the case of an error, hosts is undefined. In the case of success, errmsg is undefined. On success __pmUnparseHostSpec returns a positive value indicating the number of characters written into the supplied buffer. However, if the supplied buffer was too small, a negative status code of -E2BIG is returned.
pmcd(1), pmproxy(1), pmchart(1), __pmParseHostAttrsSpec(3), PMAPI(3) and pmNewContext(3). Performance Co-Pilot PCP PMPARSEHOSTSPEC(3)

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