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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | VERSIONS | STANDARDS | SEE ALSO | COLOPHON |
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getnetent_r(3) Library Functions Manual getnetent_r(3)
getnetent_r, getnetbyname_r, getnetbyaddr_r - get network entry
(reentrant)
Standard C library (libc, -lc)
#include <netdb.h>
int getnetent_r(struct netent *restrict result_buf,
char buf[restrict .buflen], size_t buflen,
struct netent **restrict result,
int *restrict h_errnop);
int getnetbyname_r(const char *restrict name,
struct netent *restrict result_buf,
char buf[restrict .buflen], size_t buflen,
struct netent **restrict result,
int *restrict h_errnop);
int getnetbyaddr_r(uint32_t net, int type,
struct netent *restrict result_buf,
char buf[restrict .buflen], size_t buflen,
struct netent **restrict result,
int *restrict h_errnop);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
getnetent_r(), getnetbyname_r(), getnetbyaddr_r():
Since glibc 2.19:
_DEFAULT_SOURCE
glibc 2.19 and earlier:
_BSD_SOURCE || _SVID_SOURCE
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.
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.
ENOENT (getnetent_r()) No more records in database.
ERANGE buf is too small. Try again with a larger buffer (and
increased buflen).
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────┬───────────────┬────────────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────┼───────────────┼────────────────┤
│ getnetent_r(), │ Thread safety │ MT-Safe locale │
│ getnetbyname_r(), │ │ │
│ getnetbyaddr_r() │ │ │
└──────────────────────────────┴───────────────┴────────────────┘
Functions with similar names exist on some other systems, though
typically with different calling signatures.
GNU.
getnetent(3), networks(5)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 getnetent_r(3)
Pages that refer to this page: getnetent(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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