#include <netdb.h> void endnetent(void); struct netent *getnetbyaddr(uint32_t net, int type); struct netent *getnetbyname(const char *name); struct netent *getnetent(void); void setnetent(int stayopen);
The setnetent() function shall open and rewind the database. If the stayopen argument is non-zero, the connection to the net database shall not be closed after each call to getnetent() (either directly, or indirectly through one of the other getnet*() functions), and the implementation may maintain an open file descriptor to the database.
The getnetent() function shall read the next entry of the database, opening and closing a connection to the database as necessary.
The getnetbyaddr() function shall search the database from the beginning, and find the first entry for which the address family specified by type matches the n_addrtype member and the network number net matches the n_net member, opening and closing a connection to the database as necessary. The net argument shall be the network number in host byte order.
The getnetbyname() function shall search the database from the beginning and find the first entry for which the network name specified by name matches the n_name member, opening and closing a connection to the database as necessary.
The getnetbyaddr(), getnetbyname(), and getnetent() functions shall each return a pointer to a netent structure, the members of which shall contain the fields of an entry in the network database.
The endnetent() function shall close the database, releasing any open file descriptor.
The application shall not modify the structure to which the return value points, nor any storage areas pointed to by pointers within the structure. The returned pointer, and pointers within the structure, might be invalidated or the structure or the storage areas might be overwritten by a subsequent call to getnetbyaddr(), getnetbyname(), or getnetent(). The returned pointer, and pointers within the structure, might also be invalidated if the calling thread is terminated.
Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .