getservbyname(3xnet)

1endservent(3XNET)X/Open Networking Services Library Functionsendservent(3XNET)
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NAME

6       endservent, getservbyport, getservbyname, getservent, setservent - net‐
7       work services database functions
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SYNOPSIS

10       cc [ flag ... ] file ... -lxnet [ library ... ]
11       #include <netdb.h>
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13       void endservent(void)
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16       struct servent *getservbyname(const char *name, const char *proto);
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19       struct servent *getservbyport(int port, const char *proto);
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22       struct servent *getservent(void)
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25       void setservent(int stayopen);
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DESCRIPTION

29       The getservbyname(), getservbyport() and  getservent()  functions  each
30       return  a  pointer to a servent structure, the members of which contain
31       the fields of an entry in the network services database.
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34       The getservent() function reads the next entry of the database, opening
35       a connection to the database if necessary.
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38       The  getservbyname()  function searches the database from the beginning
39       and finds the first entry for which the service name specified by  name
40       matches  the  s_name  member  and  the protocol name specified by proto
41       matches the s_proto member, opening a connection  to  the  database  if
42       necessary.  If proto is a null pointer, any value of the s_proto member
43       will be matched.
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46       The getservbyport() function searches the database from  the  beginning
47       and  finds the first entry for which the port specified by port matches
48       the s_port member and the protocol name specified by proto matches  the
49       s_proto  member, opening a connection to the database if necessary.  If
50       proto is a null pointer, any  value  of  the  s_proto  member  will  be
51       matched.  The port argument must be in network byte order.
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54       The  setservent() function opens a connection to the database, and sets
55       the next entry to the first entry.  If the stayopen  argument  is  non-
56       zero,  the  net database will not be closed after each call to the get‐
57       servent() function, either directly, or indirectly through one  of  the
58       other getserv*() functions.
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61       The endservent() function closes the database.
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USAGE

64       The  port  argument  of getservbyport() need not be compatible with the
65       port values of all address families.
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68       The getservent(), getservbyname()  and  getservbyport()  functions  may
69       return  pointers to static data, which may be overwritten by subsequent
70       calls to any of these functions.
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73       These functions are generally used with the Internet address family.
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RETURN VALUES

76       On successful completion, getservbyname(), getservbyport() and  getser‐
77       vent()  return  a pointer to a servent structure if the requested entry
78       was found, and a null pointer if the end of the database was reached or
79       the  requested  entry  was  not  found.   Otherwise,  a null pointer is
80       returned.
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ERRORS

83       No errors are defined.
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ATTRIBUTES

86       See attributes(5) for descriptions of the following attributes:
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91       ┌─────────────────────────────┬─────────────────────────────┐
92       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
93       ├─────────────────────────────┼─────────────────────────────┤
94       │Interface Stability          │Standard                     │
95       ├─────────────────────────────┼─────────────────────────────┤
96       │MT-Level                     │MT-Safe                      │
97       └─────────────────────────────┴─────────────────────────────┘
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