1GETPROTOENT(3)             Linux Programmer's Manual            GETPROTOENT(3)
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NAME

6       getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent
7       - get protocol entry
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SYNOPSIS

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

23       The getprotoent() function reads the  next  entry  from  the  protocols
24       database (see protocols(5)) and returns a protoent structure containing
25       the broken-out fields from the entry.  A connection is  opened  to  the
26       database if necessary.
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28       The  getprotobyname()  function  returns  a  protoent structure for the
29       entry from the database that matches the protocol name name.  A connec‐
30       tion is opened to the database if necessary.
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32       The  getprotobynumber()  function  returns a protoent structure for the
33       entry from the database that matches the  protocol  number  number.   A
34       connection is opened to the database if necessary.
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36       The setprotoent() function opens a connection to the database, and sets
37       the next entry to the first entry.  If stayopen is  nonzero,  then  the
38       connection  to  the database will not be closed between calls to one of
39       the getproto*() functions.
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41       The endprotoent() function closes the connection to the database.
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43       The protoent structure is defined in <netdb.h> as follows:
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45           struct protoent {
46               char  *p_name;       /* official protocol name */
47               char **p_aliases;    /* alias list */
48               int    p_proto;      /* protocol number */
49           }
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51       The members of the protoent structure are:
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53       p_name The official name of the protocol.
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55       p_aliases
56              A NULL-terminated list of alternative names for the protocol.
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58       p_proto
59              The protocol number.
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RETURN VALUE

62       The getprotoent(), getprotobyname()  and  getprotobynumber()  functions
63       return  a  pointer  to  a statically allocated protoent structure, or a
64       NULL pointer if an error occurs or the end of the file is reached.
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FILES

67       /etc/protocols
68              protocol database file
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CONFORMING TO

71       4.3BSD, POSIX.1-2001.
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SEE ALSO

74       getnetent(3), getprotoent_r(3), getservent(3), protocols(5)
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COLOPHON

77       This page is part of release 3.53 of the Linux  man-pages  project.   A
78       description  of  the project, and information about reporting bugs, can
79       be found at http://www.kernel.org/doc/man-pages/.
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83GNU                               2008-08-19                    GETPROTOENT(3)
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