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C Interface
#include <netdb.h>
struct protoent *getprotoent ()
struct protoent *getprotobyname (name)
char *name;
struct protoent *getprotobynumber (proto)
int proto;
setprotoent (stayopen)
int stayopen;
endprotoent ()
Description
The getprotoent, getprotobyname, and
getprotobynumber subroutines each return a pointer to an object with
the following structure. This structure contains fields found in the network
protocol database, /etc/protocols.
struct protoent {
char *p_name; /* official name of protocol */
char **p_aliases; /* alias list */
long p_proto; /* protocol number */
};
The members of this structure are as follows:
- p_name
- The official name of the protocol.
- p_aliases
- A null-terminated list of alternate names for the protocol.
- p_proto
- The protocol number.
The getprotoent subroutine reads the next line of the file, opening
the file if necessary.
The setprotoent subroutine opens and rewinds the file. If the
stayopen flag is non-zero, the protocol database is not closed
after each call to getprotoent (either directly or indirectly through
one of the other getproto calls).
The endprotoent subroutine closes the file.
The getprotobyname and getprotobynumber subroutines
sequentially search from the beginning of the file until a protocol name
matching the parameter name or a protocol number matching the
parameter proto is found, or until EOF is encountered.
Restrictions
All information is contained in a static area, so it must be copied if it is
to be saved. Only the Internet protocols are currently understood.
Return Value
The getprotoent, getprotobyname, and getprotobynumber
subroutines return a null pointer (0) on EOF or when they are unable to open
PROTOCOL.NET.SYS.
MPE/iX Specific
The name of the protocols file on MPE/iX is PROTOCOL.NET.SYS, as
opposed to /etc/protocols on HP-UX.
Author
UCB (University of California at Berkeley)
Files
PROTOCOL.NET.SYS
See Also
protocols
[3kRanger: Topics not located]
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