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getservbyport
Langue: en
Version: 2008-08-19 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
getservent, getservbyname, getservbyport, setservent, endservent - get service entrySYNOPSIS
#include <netdb.h> struct servent *getservent(void); struct servent *getservbyname(const char *name, const char *proto); struct servent *getservbyport(int port, const char *proto); void setservent(int stayopen); void endservent(void);
DESCRIPTION
The getservent() function reads the next entry from the services database (see services(5)) and returns a servent structure containing the broken-out fields from the entry. A connection is opened to the database if necessary.The getservbyname() function returns a servent structure for the entry from the database that matches the service name using protocol proto. If proto is NULL, any protocol will be matched. A connection is opened to the database if necessary.
The getservbyport() function returns a servent structure for the entry from the database that matches the port port (given in network byte order) using protocol proto. If proto is NULL, any protocol will be matched. A connection is opened to the database if necessary.
The setservent() 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 getserv*() functions.
The endservent() function closes the connection to the database.
The servent structure is defined in <netdb.h> as follows:
struct servent { char *s_name; /* official service name */ char **s_aliases; /* alias list */ int s_port; /* port number */ char *s_proto; /* protocol to use */ }
The members of the servent structure are:
- s_name
- The official name of the service.
- s_aliases
- A NULL-terminated list of alternative names for the service.
- s_port
- The port number for the service given in network byte order.
- s_proto
- The name of the protocol to use with this service.
RETURN VALUE
The getservent(), getservbyname() and getservbyport() functions return a pointer to a statically allocated servent structure, or a NULL pointer if an error occurs or the end of the file is reached.FILES
- /etc/services
- services database file
CONFORMING TO
4.3BSD, POSIX.1-2001.SEE ALSO
getnetent(3), getprotoent(3), getservent_r(3), services(5)COLOPHON
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