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Get a protocol entry, given a number
#include <netdb.h>
struct protoent * getprotobynumber( int proto );
- proto
- The protocol number whose entry you want to get.
libsocket
Use the -l socket option to
qcc
to link against this library.
The getprotobynumber() function gets the protocol entry
for the given number. It returns a pointer to structure of type
protoent, which
contains the broken-out fields of a line in the network
protocol database, /etc/protocols.
The
setprotoent()
function opens and rewinds the file.
If you pass a nonzero stayopen argument to
setprotoent(), the protocol database isn't closed after each call to
getprotobyname()
or getprotobynumber().
The getprotobyname() and getprotobynumber()
functions sequentially search from the beginning of the file until a
matching protocol name or protocol number is found, or until EOF is encountered.
A pointer to a valid protoent structure, or NULL if an error occurs.
- /etc/protocols
- Protocol name database file.
POSIX 1003.1
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
This function uses static data; if you need the data for future use, copy
it before any subsequent calls overwrite it.
Currently, only the Internet protocols are understood.
endprotoent(),
getprotobyname(),
getprotoent(),
protoent,
setprotoent()
/etc/protocols
in the Utilities Reference
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