1ENDPROTOENT(3P)            POSIX Programmer's Manual           ENDPROTOENT(3P)
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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.
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NAME

12       endprotoent, getprotobyname, getprotobynumber, getprotoent, setprotoent
13       - network protocol database functions
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SYNOPSIS

16       #include <netdb.h>
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18       void endprotoent(void);
19       struct protoent *getprotobyname(const char *name);
20       struct protoent *getprotobynumber(int proto);
21       struct protoent *getprotoent(void);
22       void setprotoent(int stayopen);
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DESCRIPTION

26       These functions shall retrieve information about protocols. 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.
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31       The setprotoent() function shall open a connection to the database, and
32       set the next entry to the first entry. If the stayopen argument is non-
33       zero, the connection to the network  protocol  database  shall  not  be
34       closed after each call to getprotoent() (either directly, or indirectly
35       through one of the other getproto*() functions), and the implementation
36       may maintain an open file descriptor for the database.
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38       The getprotobyname() function shall search the database from the begin‐
39       ning and find the first entry for which the protocol name specified  by
40       name matches the p_name member, opening and closing a connection to the
41       database as necessary.
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43       The getprotobynumber() function shall  search  the  database  from  the
44       beginning and find the first entry for which the protocol number speci‐
45       fied by proto matches the p_proto member, opening and closing a connec‐
46       tion to the database as necessary.
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48       The  getprotoent()  function shall read the next entry of the database,
49       opening and closing a connection to the database as necessary.
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51       The getprotobyname(), getprotobynumber(), and  getprotoent()  functions
52       shall  each  return  a  pointer to a protoent structure, the members of
53       which shall contain the fields of an  entry  in  the  network  protocol
54       database.
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56       The  endprotoent() function shall close the connection to the database,
57       releasing any open file descriptor.
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59       These functions need not be reentrant. A function that is not  required
60       to be reentrant is not required to be thread-safe.
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RETURN VALUE

63       Upon  successful  completion, getprotobyname(), getprotobynumber(), and
64       getprotoent() return a pointer to a protoent structure if the requested
65       entry  was  found,  and  a  null pointer if the end of the database was
66       reached or the requested entry was not found. Otherwise, a null pointer
67       is returned.
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ERRORS

70       No errors are defined.
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72       The following sections are informative.
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EXAMPLES

75       None.
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APPLICATION USAGE

78       The  getprotobyname(),  getprotobynumber(), and getprotoent() functions
79       may return pointers to static data, which may be overwritten by  subse‐
80       quent calls to any of these functions.
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RATIONALE

83       None.
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FUTURE DIRECTIONS

86       None.
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SEE ALSO

89       The Base Definitions volume of IEEE Std 1003.1-2001, <netdb.h>
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92       Portions  of  this text are reprinted and reproduced in electronic form
93       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
94       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
95       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
96       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
97       event of any discrepancy between this version and the original IEEE and
98       The  Open Group Standard, the original IEEE and The Open Group Standard
99       is the referee document. The original Standard can be  obtained  online
100       at http://www.opengroup.org/unix/online.html .
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104IEEE/The Open Group                  2003                      ENDPROTOENT(3P)
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