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GETRPCENT_R(3)                                                          Linux Programmer's Manual                                                         GETRPCENT_R(3)

NAME
       getrpcent_r, getrpcbyname_r, getrpcbynumber_r - get RPC entry (reentrant)

SYNOPSIS
       #include <netdb.h>

       int getrpcent_r(struct rpcent *result_buf, char *buf,
                       size_t buflen, struct rpcent **result);
       int getrpcbyname_r(const char *name,
                       struct rpcent *result_buf, char *buf,
                       size_t buflen, struct rpcent **result);
       int getrpcbynumber_r(int number,
                       struct rpcent *result_buf, char *buf,
                       size_t buflen, struct rpcent **result);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getrpcent_r(), getrpcbyname_r(), getrpcbynumber_r():
           Since glibc 2.19:
               _DEFAULT_SOURCE
           Glibc 2.19 and earlier:
               _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION
       The  getrpcent_r(),  getrpcbyname_r(),  and getrpcbynumber_r() functions are the reentrant equivalents of, respectively, getrpcent(3), getrpcbyname(3), and getr‐
       pcbynumber(3).  They differ in the way that the rpcent structure is returned, and in the function calling signature and return value.  This manual page describes
       just the differences from the nonreentrant functions.

       Instead of returning a pointer to a statically allocated rpcent structure as the function result, these functions copy the structure into the location pointed to
       by result_buf.

       The buf array is used to store the string fields pointed to by the returned rpcent structure.  (The nonreentrant functions allocate these strings in static stor‐
       age.)   The  size  of  this array is specified in buflen.  If buf is too small, the call fails with the error ERANGE, and the caller must try again with a larger
       buffer.  (A buffer of length 1024 bytes should be sufficient for most applications.)

       If the function call successfully obtains an RPC record, then *result is set pointing to result_buf; otherwise, *result is set to NULL.

RETURN VALUE
       On success, these functions return 0.  On error, they return one of the positive error numbers listed in ERRORS.

       On error, record not found (getrpcbyname_r(), getrpcbynumber_r()), or end of input (getrpcent_r()) result is set to NULL.

ERRORS
       ENOENT (getrpcent_r()) No more records in database.

       ERANGE buf is too small.  Try again with a larger buffer (and increased buflen).

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬────────────────┐
       │Interface                                                                                                                      │ Attribute     │ Value          │
       ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼────────────────┤
       │getrpcent_r(), getrpcbyname_r(), getrpcbynumber_r()                                                                            │ Thread safety │ MT-Safe locale │
       └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴────────────────┘

CONFORMING TO
       These functions are GNU extensions.  Functions with similar names exist on some other systems, though typically with different calling signatures.

SEE ALSO
       getrpcent(3), rpc(5)

GNU                                                                            2021-03-22                                                                 GETRPCENT_R(3)