man3/getrpcport.3

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   7 .\" @(#)getrpcport.3r   2.2 88/08/02 4.0 RPCSRC; from 1.12 88/02/26 SMI
   8 .TH GETRPCPORT 3 2017-09-15 "" "Linux Programmer's Manual"
   9 .SH NAME
  10 getrpcport \- get RPC port number
  11 .SH SYNOPSIS
  12 .nf
  13 .B "#include <rpc/rpc.h>"
  14 .PP
  15 .BI "int getrpcport(const char *" host ", unsigned long " prognum ,
  16 .BI "               unsigned long " versnum ", unsigned " proto );
  17 .fi
  18 .SH DESCRIPTION
  19 .BR getrpcport ()
  20 returns the port number for version
  21 .I versnum
  22 of the RPC program
  23 .I prognum
  24 running on
  25 .I host
  26 and using protocol
  27 .IR proto .
  28 It returns 0 if it cannot contact the portmapper, or if
  29 .I prognum
  30 is not registered.
  31 If
  32 .I prognum
  33 is registered but not with version
  34 .IR versnum ,
  35 it will still return a port number (for some version of the program)
  36 indicating that the program is indeed registered.
  37 The version mismatch will be detected upon the first call to the service.
  38 .SH ATTRIBUTES
  39 For an explanation of the terms used in this section, see
  40 .BR attributes (7).
  41 .TS
  42 allbox;
  43 lb lb lb
  44 l l l.
  45 Interface       Attribute       Value
  46 T{
  47 .BR getrpcport ()
  48 T}      Thread safety   MT-Safe env locale
  49 .TE
  50 .sp 1
  51 .SH CONFORMING TO
  52 Not in POSIX.1.
  53 Present on the BSDs, Solaris, and many other systems.