Manpage of GETSERVENT

GETSERVENT

Section: Linux Programmer's Manual (3)
Updated: 2015-07-23
Index
 

NAME

getservent, getservbyname, getservbyport, setservent, endservent - get service entry  

SYNOPSIS

#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 serventstructure containing the broken-out fields from the entry. A connection is opened to the database if necessary.

The getservbyname() function returns a serventstructure for the entry from the database that matches the service nameusing protocol proto. If protois NULL, any protocol will be matched. A connection is opened to the database if necessary.

The getservbyport() function returns a serventstructure for the entry from the database that matches the port port(given in network byte order) using protocol proto. If protois 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 stayopenis nonzero, 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 serventstructure 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 serventstructure 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 serventstructure, or NULL if an error occurs or the end of the file is reached.  

FILES

/etc/services
services database file
 

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
getservent() Thread safetyMT-Unsafe race:servent
race:serventbuf locale
getservbyname() Thread safetyMT-Unsafe race:servbyname
locale
getservbyport() Thread safetyMT-Unsafe race:servbyport
locale
setservent(),
endservent()
Thread safetyMT-Unsafe race:servent
locale

In the above table, serventin race:serventsignifies that if any of the functions setservent(3), getservent(3), or endservent(3) are used in parallel in different threads of a program, then data races could occur.  

CONFORMING TO

POSIX.1-2001, POSIX.1-2008, 4.3BSD.  

SEE ALSO

getnetent(3), getprotoent(3), getservent_r(3), services(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
FILES
ATTRIBUTES
CONFORMING TO
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 22:27:58 GMT, June 20, 2016