pmhttpnewclient(3) — Linux manual page


PMHTTPNEWCLIENT(3)      Library Functions Manual      PMHTTPNEWCLIENT(3)

NAME         top

       pmhttpNewClient, pmhttpFreeClient, pmhttpClientFetch - simple
       HTTP client interfaces

C SYNOPSIS         top

       #include <pcp/pmapi.h>
       #include <pcp/pmhttp.h>

       struct http_client *pmhttpNewClient(void);
       void pmhttpFreeClient(struct http_client *client);
       int pmhttpClientFetch(struct http_client *client, const char
               *url, char *bodybuf, size_t bodylen, char *typebuf,
               size_t typelen);

       cc ... -lpcp_web

DESCRIPTION         top

       pmhttpNewClient  allocates  and initializes an opaque HTTP client
       that is ready to make requests from a server.

       The URL request interface pmhttpClientFetch issues  an  HTTP  GET
       request to the server specified in the supplied url.  The body of
       the  response  is returned in the caller supplied bodybuf buffer,
       of bodylen bytes length.  An optional typebuf buffer, of  typelen
       bytes length, can also be supplied and (if non-NULL) will contain
       the value of the content-type header returned from the server.

       The  url parameter is an RFC1630 format URL.  This will typically
       be prefixed with "http://", however these interfaces also support
       Unix domain sockets.  Those are instead  prefixed  by  "unix://",
       followed  by  the full filesystem path to the desired Unix domain

       To free up resources associated with an  HTTP  client,  including
       closing  any  persistent  server  connection that has been estab‐
       lished earlier, is accomplished using the  pmhttpFreeClient  rou‐

DIAGNOSTICS         top

       pmhttpNewClient will return NULL on failure, which can only occur
       when allocation of memory is not possible.

       pmhttpClientFetch will return the number of bytes places into the
       bodybuf  buffer,  else a negated error code indicating the nature
       of the failure.

SEE ALSO         top

       pmdaapache(1),   pmjsonInit(3),   PMAPI(3),    PMWEBAPI(3)    and .

COLOPHON         top

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Performance Co-Pilot               PCP                PMHTTPNEWCLIENT(3)