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28 .\" @(#)getnetent.3 8.1 (Berkeley) 6/4/93
29 .\" $FreeBSD: src/lib/libc/net/getnetent.3,v 1.23 2007/01/09 00:28:02 imp Exp $
51 .Fn getnetent_r "struct netent *ne" "char *buffer" "size_t buflen" "struct netent **result" "int *h_errnop"
53 .Fn getnetbyname "const char *name"
55 .Fn getnetbyname_r "const char *name" "struct netent *ne" "char *buffer" "size_t buflen" "struct netent **result" "int *h_errnop"
57 .Fn getnetbyaddr "uint32_t net" "int type"
59 .Fn getnetbyaddr_r "uint32_t addr" "int af" "struct netent *ne" "char *buffer" "size_t buflen" "struct netent **result" "int *h_errnop"
61 .Fn setnetent "int stayopen"
71 each return a pointer to an object with the
72 following structure describing an internet network.
73 This structure contains either the information obtained
76 broken-out fields of a line in the network data base
78 or entries supplied by the
81 The order of the lookups is controlled by the
84 .Bd -literal -offset indent
86 char *n_name; /* official name of net */
87 char **n_aliases; /* alias list */
88 int n_addrtype; /* net number type */
89 uint32_t n_net; /* net number */
93 The members of this structure are:
94 .Bl -tag -width n_addrtype
96 The official name of the network.
98 A zero terminated list of alternate names for the network.
100 The type of the network number returned; currently only
104 Network numbers are returned in machine byte
111 reads the next line of the file, opening the file if necessary.
116 opens and rewinds the file.
120 the net data base will not be closed after each call to
135 sequentially search from the beginning
136 of the file until a matching
138 net address and type is found,
147 Network numbers are supplied in host order.
154 functions are reentrant versions of the above functions that take a
157 structure which is used to store state information.
158 The structure must be zero-filled before it is used
159 and should be considered opaque for the sake of portability.
160 These functions also take a pointer to another
162 structure which is used to store the results of the database lookup.
169 functions return a pointer to a
171 structure on success or a null pointer if end-of-file
172 is reached or an error occurs.
179 functions return 0 on success or \-1 if end-of-file
180 is reached or an error occurs.
182 .Bl -tag -width ".Pa /etc/nsswitch.conf" -compact
184 .It Pa /etc/nsswitch.conf
185 .It Pa /etc/resolv.conf
207 functions are not currently standardized.
216 functions appeared in
224 functions appeared in
227 The data space used by
228 these functions is thread-specific; if future use requires the data, it should be
229 copied before any subsequent calls to these functions overwrite it.
230 Only Internet network
231 numbers are currently understood.
232 Expecting network numbers to fit
233 in no more than 32 bits is probably