10-08-2001
Did you write the code?
Was it written for and compiled on UNIX/Linux?
Does the code interact with any devices or shared resources?
In general (based on your question alone), you can run a
"black box" type of process any number of times from any
number of termials. Much depends on what it is the code
needs to do.
The basics for writing reentrant functions is
a reentrant function does not hold static data over successive
calls, nor does it return a pointer to static data. All data is
provided by the caller of the function. A reentrant function must
not call non-reentrant functions.
In most cases, non-reentrant functions must be replaced by
functions with a modified interface to be reentrant. Non-reentrant
functions cannot be used by multiple threads. Furthermore, it may
be impossible to make a non-reentrant function thread-safe.
You may want to pick up a book or two on advanced unix
programming and programming threads for a more in-depth
discussion on reentrant and thread-safe code.
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LEARN ABOUT HPUX
setprotoent
getprotoent(3N) getprotoent(3N)
NAME
getprotoent(), getprotobynumber(), getprotobyname(), setprotoent(), endprotoent() - get, set, or end protocol entry
SYNOPSIS
_XOPEN_SOURCE_EXTENDED only
DESCRIPTION
The and functions each return a pointer to a structure of type protoent containing the broken-out fields of a line in the network protocol
data base,
The members of this structure are:
The official name of the protocol.
A null-terminated list of alternate names for the protocol.
The protocol number.
Functions behave as follows:
Reads the next line of the file, opening the file if necessary.
Opens and rewinds the file.
If the stayopen flag is non-zero, the protocol data base is not closed after each call to (either directly or
indirectly through one of the other calls).
Closes the file.
Each sequentially searches from the beginning of the file until a matching
protocol name (among either the official names or the aliases) or protocol number is found, or until EOF is
encountered.
In a multithreaded application, and use thread-specific storage that is re-used in each call. The return value should be unique for each
thread and should be saved, if desired, before the thread makes the next call.
For enumeration in multithreaded applications, the position within the enumeration is a process-wide property shared by all threads. may
be used in a multithreaded application, but resets the enumeration position for all threads. enumerates protocol entries: successive calls
to will return either successive protocol entries or NULL. If multiple threads interleave calls to the threads will enumerate disjoint
subsets of the protocol database.
If the system is running the Network Information Service (NIS), and get the protocol information from the NIS server (see ypserv(1M) and
ypfiles(4)).
Name Service Switch-Based Operation
The library routines and their reentrant counterparts, internally call the name service switch to access the "protocols" database lookup
policy configured in the file (see nsswitch.conf(4)). The lookup policy defines the order and the criteria of the supported name services
used to resolve protocol names and numbers.
RETURN VALUE
and return a null pointer(0) on EOF or when they are unable to open
OBSOLESCENT INTERFACES
The above reentrant interfaces have been moved from to They are included to support existing applications and may be removed in a future
release. New multithreaded applications should use the regular APIs without
The reentrant interfaces performs the same operation as their regular counterpart (those without the suffix.) However, and expect to be
passed the address of a parameter and will store the address of the result at this supplied parameter. An additional parameter, an address
to struct protoent_data, which is defined in the file cannot be a NULL pointer.
The reentrant routines return if the operation is unsuccessful, or, in the case of if the end of the services list has been reached. is
returned otherwise.
EXAMPLES
The following code excerpt counts the number of protocols entries:
WARNINGS
Programs that use the interfaces described in this manpage cannot be linked statically because the implementations of these functions
employ dynamic loading and linking of shared objects at run time.
AUTHOR
was developed by Sun Microsystems Inc.
FILES
SEE ALSO
ypserv(1M), nsswitch.conf(4), protocols(4), ypfiles(4), thread_safety(5).
STANDARDS CONFORMANCE
getprotoent(3N)