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GETPROTOENT (3) | C library functions | Unix Manual Pages | :man▋
NAME
getprotoent, getprotobynumber, getprotobyname, setprotoent, endprotoent - get protocol entry
CONTENTS
Library
Synopsis
Description
Return Values
Files
See Also
History
Bugs
LIBRARY
.Lb libc
SYNOPSIS
.In 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, getprotobyname, and getprotobynumber functions each return a pointer to an object with the following structure containing the broken-out fields of a line in the network protocol data base, /etc/protocols.
struct protoent {
char *p_name; /* official name of protocol */
char **p_aliases; /* alias list */
intp_proto; /* protocol number */
};
The members of this structure are: | p_name | The official name of the protocol. | | p_aliases | | | A zero terminated list of alternate names for the protocol. | | p_proto | The protocol number. | |
The getprotoent function reads the next line of the file, opening the file if necessary. The setprotoent function opens and rewinds the file. If the stayopen flag is non-zero, the net data base will not be closed after each call to getprotobyname or getprotobynumber. The endprotoent function closes the file. The getprotobyname function and getprotobynumber sequentially search from the beginning of the file until a matching protocol name or protocol number is found, or until EOF is encountered.
RETURN VALUES
Null pointer (0) returned on EOF or error.
FILES
SEE ALSO
protocols(5)
HISTORY
BUGS
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