1ENDNETENT(3P)              POSIX Programmer's Manual             ENDNETENT(3P)
2
3
4

PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
10
11

NAME

13       endnetent, getnetbyaddr, getnetbyname, getnetent, setnetent  —  network
14       database functions
15

SYNOPSIS

17       #include <netdb.h>
18
19       void endnetent(void);
20       struct netent *getnetbyaddr(uint32_t net, int type);
21       struct netent *getnetbyname(const char *name);
22       struct netent *getnetent(void);
23       void setnetent(int stayopen);
24

DESCRIPTION

26       These  functions shall retrieve information about networks. This infor‐
27       mation is considered to be stored in a database that  can  be  accessed
28       sequentially  or  randomly.  The  implementation  of  this  database is
29       unspecified.
30
31       The setnetent() function shall open and rewind  the  database.  If  the
32       stayopen argument is non-zero, the connection to the net database shall
33       not be closed after each call to getnetent() (either directly, or indi‐
34       rectly through one of the other getnet*() functions), and the implemen‐
35       tation may maintain an open file descriptor to the database.
36
37       The getnetent() function shall read the next  entry  of  the  database,
38       opening and closing a connection to the database as necessary.
39
40       The  getnetbyaddr()  function shall search the database from the begin‐
41       ning, and find the first entry for which the address  family  specified
42       by  type  matches  the  n_addrtype  member  and  the network number net
43       matches the n_net member, opening and closing a connection to the data‐
44       base  as  necessary.   The  net argument shall be the network number in
45       host byte order.
46
47       The getnetbyname() function shall search the database from  the  begin‐
48       ning  and  find the first entry for which the network name specified by
49       name matches the n_name member, opening and closing a connection to the
50       database as necessary.
51
52       The  getnetbyaddr(),  getnetbyname(),  and  getnetent() functions shall
53       each return a pointer to a netent structure, the members of which shall
54       contain the fields of an entry in the network database.
55
56       The  endnetent()  function shall close the database, releasing any open
57       file descriptor.
58
59       These functions need not be thread-safe.
60

RETURN VALUE

62       Upon successful completion, getnetbyaddr(), getnetbyname(), and  getne‐
63       tent()  shall  return  a pointer to a netent structure if the requested
64       entry was found, and a null pointer if the  end  of  the  database  was
65       reached  or  the  requested  entry  was  not  found.  Otherwise, a null
66       pointer shall be returned.
67
68       The application shall not modify the  structure  to  which  the  return
69       value  points,  nor any storage areas pointed to by pointers within the
70       structure. The returned pointer, and  pointers  within  the  structure,
71       might  be  invalidated  or  the structure or the storage areas might be
72       overwritten by a subsequent call to getnetbyaddr(), getnetbyname(),  or
73       getnetent().
74

ERRORS

76       No errors are defined.
77
78       The following sections are informative.
79

EXAMPLES

81       None.
82

APPLICATION USAGE

84       None.
85

RATIONALE

87       None.
88

FUTURE DIRECTIONS

90       None.
91

SEE ALSO

93       The Base Definitions volume of POSIX.1‐2008, <netdb.h>
94
96       Portions  of  this text are reprinted and reproduced in electronic form
97       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
98       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
99       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
100       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
101       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
102       event of any discrepancy between this version and the original IEEE and
103       The Open Group Standard, the original IEEE and The Open Group  Standard
104       is  the  referee document. The original Standard can be obtained online
105       at http://www.unix.org/online.html .
106
107       Any typographical or formatting errors that appear  in  this  page  are
108       most likely to have been introduced during the conversion of the source
109       files to man page format. To report such errors,  see  https://www.ker
110       nel.org/doc/man-pages/reporting_bugs.html .
111
112
113
114IEEE/The Open Group                  2013                        ENDNETENT(3P)
Impressum