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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11

NAME

13       endprotoent, getprotobyname, getprotobynumber, getprotoent, setprotoent
14       — network protocol database functions
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SYNOPSIS

17       #include <netdb.h>
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19       void endprotoent(void);
20       struct protoent *getprotobyname(const char *name);
21       struct protoent *getprotobynumber(int proto);
22       struct protoent *getprotoent(void);
23       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 thread-safe.
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RETURN VALUE

62       Upon successful completion, getprotobyname(),  getprotobynumber(),  and
63       getprotoent() return a pointer to a protoent 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 is returned.
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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  getprotobyname(),  getprotobynum‐
73       ber(), or getprotoent().
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ERRORS

76       No errors are defined.
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78       The following sections are informative.
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EXAMPLES

81       None.
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APPLICATION USAGE

84       None.
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RATIONALE

87       None.
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FUTURE DIRECTIONS

90       None.
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SEE ALSO

93       The Base Definitions volume of POSIX.1‐2008, <netdb.h>
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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 .
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114IEEE/The Open Group                  2013                      ENDPROTOENT(3P)
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