getprotobynumber(3xnet)

1endprotoent(3XNET)X/Open Networking Services Library Functionsendprotoent(3XNET)
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NAME

6       endprotoent, getprotobynumber, getprotobyname, getprotoent, setprotoent
7       - network protocol database functions
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SYNOPSIS

10       cc [ flag ... ] file ... -lxnet [ library ... ]
11       #include <netdb.h>
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13       void endprotoent(void)
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16       struct protoent *getprotobyname(const char *name);
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19       struct protoent *getprotobynumber(int proto);
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22       struct protoent *getprotoent(void)
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25       void setprotoent(int stayopen);
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DESCRIPTION

29       The getprotobyname(), getprotobynumber() and  getprotoent(),  functions
30       each  return  a  pointer  to a protoent structure, the members of which
31       contain the fields of an entry in the network protocol database.
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34       The getprotoent() function reads the next entry of the database,  open‐
35       ing a connection to the database if necessary.
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38       The  getprotobyname() function searches the database from the beginning
39       and finds the first entry for which the protocol name specified by name
40       matches the p_name member, opening a connection to the database if nec‐
41       essary.
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44       The getprotobynumber() function searches the database from  the  begin‐
45       ning  and finds the first entry for which the protocol number specified
46       by number matches the p_proto member, opening a connection to the data‐
47       base if necessary.
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50       The setprotoent() function opens a connection to the database, and sets
51       the next entry to the first entry.  If the stayopen  argument  is  non-
52       zero,  the  connection  to  the  network  protocol database will not be
53       closed after each call to getprotoent() (either directly, or indirectly
54       through one of the other getproto*() functions).
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57       The endprotoent() function closes the connection to the database.
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USAGE

60       The  getprotobyname(),  getprotobynumber()  and getprotoent() functions
61       may return pointers to static data, which may be overwritten by  subse‐
62       quent calls to any of these functions.
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65       These functions are generally used with the Internet address family.
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RETURN VALUES

68       On successful completion, getprotobyname(), getprotobynumber() and get‐
69       protoent() functions return a pointer to a protoent  structure  if  the
70       requested  entry  was found, and a null pointer if the end of the data‐
71       base was reached or the requested entry was not  found.   Otherwise,  a
72       null pointer is returned.
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ERRORS

75       No errors are defined.
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ATTRIBUTES

78       See attributes(5) for descriptions of the following attributes:
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83       ┌─────────────────────────────┬─────────────────────────────┐
84       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
85       ├─────────────────────────────┼─────────────────────────────┤
86       │Interface Stability          │Standard                     │
87       ├─────────────────────────────┼─────────────────────────────┤
88       │MT-Level                     │MT-Safe                      │
89       └─────────────────────────────┴─────────────────────────────┘
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