Table of Contentsgetservent, getservbyname, getservbyport, setservent, endservent - get service entry #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); The getservent() function reads the next line from the file /etc/services and returns a structure servent containing the broken out fields from the line. The /etc/services file is opened if necessary. The getservbyname() function returns a servent structure for the line from /etc/services that matches the service name using protocol proto.
The getservbyport() function returns a servent structure for the line that matches the port port using protocol proto.
The setservent() function opens and rewinds the /etc/services file. If stayopen is true (1), then the file will not be closed between calls to getservbyname() and getservbyport().
The endservent() function closes /etc/services.
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 zero 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.
The getservent(), getservbyname() and getservbyport() functions return the servent structure, or a NULL pointer if an error occurs or the end of the file is reached. /etc/services services database file BSD 4.3 getprotoent(3), getnetent(3), services(5)
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