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GETNETENT_R
Section: Linux Programmer's Manual (3)
Updated: 2010-09-10
Index
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NAME
getnetent_r, getnetbyname_r, getnetbyaddr_r - get
network entry (reentrant)
SYNOPSIS
#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)):
getnetent_r(),
getnetbyname_r(),
getnetbyaddr_r():
-
_BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
The
getnetent_r(),
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
result_buf.
The
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 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 a network record, then
*result
is set pointing to
result_buf;
otherwise,
*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
h_errno
by the nonreentrant versions of these functions.
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
(getnetbyname_r(),
getnetbyaddr_r()),
or end of input
(getnetent_r())
result
is set to NULL.
ERRORS
- ENOENT
-
(getnetent_r())
No more records in database.
- ERANGE
-
buf
is too small.
Try again with a larger buffer
(and increased
buflen).
CONFORMING TO
These functions are GNU extensions.
Functions with similar names exist on some other systems,
though typically with different calling signatures.
SEE ALSO
getnetent(3),
networks(5)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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