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Get a service entry, given a port
#include <netdb.h>
struct servent * getservbyport( int port,
const char * proto );
- port
- The port number for the service.
- proto
- NULL, or the protocol for the service.
libsocket
Use the -l socket option to
qcc
to link against this library.
The getservbyport() function gets the entry for the given
port from the services database,
/etc/services.
This function returns a pointer to a structure of type
servent, which contains
the broken-out fields of a line in the network services database.
The
setservent()
function opens and rewinds the file.
If you pass a nonzero stayopen argument to setservent(),
the services database isn't closed after each call to
getservbyname()
or getservbyport().
The getservbyport() function sequentially searches
from the beginning of the file until a matching protocol
name or port number is found, or until EOF is encountered.
If a protocol name is also supplied (non-NULL), searches
must also match the protocol.
A valid pointer to a servent structure, or
NULL if an error occurs.
- /etc/services
- Network services 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.
endservent(),
getservbyname(),
getservent(),
servent,
setservent()
/etc/services
in the Utilities Reference
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