Windows PowerShell command on Get-command ne_sock

Manual Pages for UNIX Operating System command usage for man ne_sock_init

neon API reference NE_SOCK_INIT(3)

NAME

ne_sock_init, ne_sock_exit - perform library initialization

SYNOPSIS

#include

int ne_sock_init(void);

void ne_sock_exit(void);

DESCRIPTION

In some platforms and configurations, neon may be using some socket or SSL libraries which require global initialization

before use. To perform this initialization, the ne_sock_init

function must be called before any other library functions are used.

Once all use of neon is complete, ne_sock_exit can be called

to perform de-initialization of socket or SSL libraries, if

necessary. Uses of ne_sock_init and ne_sock_exit are

"reference counted"; if N calls to ne_sock_init are made,

only the Nth call to ne_sock_exit will have effect.

ne_sock_init will set the disposition of the SIGPIPE signal

to ignored. No change is made to the SIGPIPE disposition by

ne_sock_exit.

Both the SSL libraries supported by neon - OpenSSL and

GnuTLS - require callbacks to be registered to allow

thread-safe use of SSL. These callbacks are stored as global

variables and so their state persists for as long as the library in question is loaded into the process. If multiple users of the SSL library exist within the process, this can be problematic, particularly if one is dynamically loaded (and may subsequently be unloaded).

If neon is configured using the --enable-threadsafe-ssl

flag, thread-safe SSL support will be enabled automatically,

as covered in the following section. Otherwise, it is not

safe to use neon with SSL in a multi-threaded process. The

ne_has_support function can be used to determine whether

neon is built to enable thread-safety support in the SSL

library.

Thread-safe SSL with OpenSSL

neon follows two simple rules when dealing with the OpenSSL locking callbacks:

+o ne_sock_init will set thread-safety locking callbacks if

and only if no locking callbacks are already registered.

+o ne_sock_exit will unset the thread-safety locking

neon 0.29.0 Last change: 13 September 2009 1

neon API reference NE_SOCK_INIT(3)

callbacks if and only if the locking callbacks

registered are those registered by ne_sock_init.

Applications and libraries should be able to co-operate to

ensure that SSL use is always thread-safe if similar rules

are always followed.

Thread-safe SSL with GnuTLS

The cryptography library used by GnuTLS, libgcrypt, only supports an initialization operation to register

thread-safety callbacks. ne_sock_init will register the

thread-safe locking callbacks on first use; ne_sock_exit

cannot unregister them. If multiple users of GnuTLS are present within the process, it is unsafe to dynamically unload neon from the process if neon is configured with

thread-safe SSL support enabled (since the callbacks would

be left pointing at unmapped memory once neon is unloaded). RETURN VALUE

ne_sock_init returns zero on success, or non-zero on error.

If an error occurs, no further use of the neon library should be attempted.

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

_______________________________________

| ATTRIBUTE TYPE | ATTRIBUTE VALUE|

|____________________|__________________|_

| Availability | library/neon |