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getprotoent
Langue: en
Version: 2008-08-19 (fedora - 05/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent - get protocol entrySYNOPSIS
#include <netdb.h> struct protoent *getprotoent(void); struct protoent *getprotobyname(const char *name); struct protoent *getprotobynumber(int proto); void setprotoent(int stayopen); void endprotoent(void);
DESCRIPTION
The getprotoent() function reads the next entry from the protocols database (see protocols(5)) and returns a protoent structure containing the broken-out fields from the entry. A connection is opened to the database if necessary.The getprotobyname() function returns a protoent structure for the entry from the database that matches the protocol name name. A connection is opened to the database if necessary.
The getprotobynumber() function returns a protoent structure for the entry from the database that matches the protocol number number. A connection is opened to the database if necessary.
The setprotoent() function opens a connection to the database, and sets the next entry to the first entry. If stayopen is non-zero, then the connection to the database will not be closed between calls to one of the getproto*() functions.
The endprotoent() function closes the connection to the database.
The protoent structure is defined in <netdb.h> as follows:
struct protoent { char *p_name; /* official protocol name */ char **p_aliases; /* alias list */ int p_proto; /* protocol number */ }
The members of the protoent structure are:
- p_name
- The official name of the protocol.
- p_aliases
- A NULL-terminated list of alternative names for the protocol.
- p_proto
- The protocol number.
RETURN VALUE
The getprotoent(), getprotobyname() and getprotobynumber() functions return a pointer to a statically allocated protoent structure, or a NULL pointer if an error occurs or the end of the file is reached.FILES
- /etc/protocols
- protocol database file
CONFORMING TO
4.3BSD, POSIX.1-2001.SEE ALSO
getnetent(3), getprotent_r(3), getservent(3), protocols(5)COLOPHON
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