getnetent_r, getnetbyname_r, getnetbyaddr_r - get network entry (reentrant)
#include <netdb.h> int getnetent_r(struct netent *result_buf, char *buf, size_t buflen, struct netent **result, int *h_errnop); int getnetbyname_r(const char *name, struct netent *result_buf, char *buf, size_t buflen, struct netent **result, int *h_errnop); int getnetbyaddr_r(uint32_t net, int type, struct netent *result_buf, char *buf, size_t buflen, struct netent **result, int *h_errnop);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
getnetbyname_r(), and getnetbyaddr_r()
functions are the reentrant equivalents of, respectively,
getnetent(3), getnetbyname(3), and
getnetbynumber(3). They differ in the way that the
netent 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
netent structure as the function result, these functions copy
the structure into the location pointed to by
buf array is used to store the string fields pointed to
by the returned
netent structure. (The nonreentrant functions
allocate these strings in static storage.) The size of this array is
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 a network record, then
*result is set pointing to
*result is set to NULL.
The buffer pointed to by
h_errnop is used to return the
value that would be stored in the global variable
the nonreentrant versions of these functions.
(getnetent_r()) No more records in database.
buf is too small. Try again with a larger buffer (and
These functions are GNU extensions. Functions with similar names exist on some other systems, though typically with different calling signatures.
This page is part of release 5.10 of the Linux
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