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getprotobyname(3)
Contents
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getprotobyname, getprotobyname_r - Get a protocol entry by
protocol name
#include <netdb.h>
struct protoent *getprotobyname(
const char *name );
[Tru64 UNIX] The following obsolete function is supported
in order to maintain backward compatibility with previous
versions of the operating system. You should not use it
in new designs. int getprotobyname_r(
const char *name,
struct protoent *proto,
struct protoent_data *proto_data );
Standard C Library (libc)
Interfaces documented on this reference page conform to
industry standards as follows:
getprotobyname(): XNS4.0, XNS5.0
Refer to the standards(5) reference page for more information
about industry standards and associated tags.
Specifies the official protocol name or alias. [Tru64
UNIX] For getprotobyname_r(), points to the protoent
structure. The netdb.h header file defines the protoent
structure. [Tru64 UNIX] For getprotobyname_r(), is data
for the protocols database. The netdb.h header file
defines the protoent_data structure.
The getprotobyname() function returns a pointer to a
structure of type protoent. Its members specify data in
fields from a record line in either the local /etc/protocols
file or the NIS network protocols database file. To
determine which file or files to search, and in which
order, the system uses the switches in the /etc/svc.conf
file. The netdb.h header file defines the protoent structure.
The getprotobyname() function searches the network protocols
database file sequentially until a match with the
name parameter occurs. The name parameter will specify
either the official protocol name or an alias. When EOF
(End-of-File) is reached without a match, an error value
is returned by this function.
When using the getprotobyname() function, use the endprotoent()
function to close the protocols file.
The getprotobyname() function returns a pointer to threadspecific
data. Subsequent calls to this or a related function
from the same thread overwrite this data.
[Tru64 UNIX] The getprotobyname_r() function is an obsolete
reentrant version of the getprotobyname() function.
It is supported in order to maintain backward compatibility
with previous versions of the operating system and
should not be used in new designs. Note that you must
zero-fill the proto_data structure before its first access
by either the setprotoent_r() or getprotobyname_r() function.
Upon successful completion, the getprotobyname() function
returns a pointer to a protoent structure. If it fails or
reaches the end of the network protocols database file, it
returns a null pointer.
[Tru64 UNIX] Upon successful completion, the getprotobyname_r()
function stores the protoent structure in the
location pointed to by proto, and returns a value of 0
(zero). Upon failure, it returns a value of -1.
Current industry standards do not define error values for
the getprotobyname() function.
[Tru64 UNIX] If any of the following conditions occurs,
the getprotobyname_r() function sets errno to the corresponding
value:
The proto_data or proto parameter is invalid. The search
failed.
In addition, if the getprotobyname() or getprotobyname_r()
function fail to open the file, it sets errno to indicate
the cause of the failure.
The Internet network protocols name database file. Each
record in the file occupies a single line and has three
fields: the official protocol name, the protocol number,
and protocol aliases. The database service selection configuration
file.
Functions: getprotobynumber(3), getprotoent(3), setprotoent(3), endprotoent(3).
Files: protocols(4), svc.conf(4)
Networks: nis_intro(7)
Standards: standards(5)
Network Programmer's Guide
getprotobyname(3)
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