GETPROTOENT

GETPROTOENT

NAME SYNOPSIS DESCRIPTION RETURN VALUE FILES CONFORMING TO SEE ALSO

NAME

getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent - get protocol entry

SYNOPSIS

#include name); struct protoent *getprotobynumber(int proto); void setprotoent(int stayopen); void endprotoent(void);

DESCRIPTION

The getprotoent() function reads the next line from the file /etc/protocols and returns a structure protoent containing the broken out fields from the line. The /etc/protocols file is opened if necessary.

The getprotobyname() function returns a protoent structure for the line from /etc/protocols that matches the protocol name name.

The getprotobynumber() function returns a protoent structure for the line that matches the protocol number number.

The setprotoent() function opens and rewinds the /etc/protocols file. If stayopen is true (1), then the file will not be closed between calls to getprotobyname() or getprotobynumber().

The endprotoent() function closes /etc/protocols.

The protoent structure is defined in 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 zero terminated list of alternative names for the protocol.

p_proto

The protocol number.

RETURN VALUE

The getprotoent(), getprotobyname() and getprotobynumber() functions return the 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

BSD 4.3

SEE ALSO

getservent(3), getnetent(3), protocols(5)