NAME

       curl_global_init - Global libcurl initialisation

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_global_init(long flags);

DESCRIPTION

       This  function  sets  up  the  program  environment that libcurl needs.  Think of it as an
       extension of the library loader.

       This function must be called at least once within a program (a program  is  all  the  code
       that  shares  a memory space) before the program calls any other function in libcurl.  The
       environment it sets up is constant for the life of the program and is the same  for  every
       program, so multiple calls have the same effect as one call.

       The  flags  option  is  a bit pattern that tells libcurl exactly what features to init, as
       described below. Set the desired bits by ORing the values together.  In normal  operation,
       you  must specify CURL_GLOBAL_ALL.  Don't use any other value unless you are familiar with
       it and mean to control internal operations of libcurl.

       This function is not thread safe. You must not call  it  when  any  other  thread  in  the
       program  (i.e.  a  thread  sharing the same memory) is running.  This doesn't just mean no
       other thread that is using libcurl.  Because curl_global_init(3) calls functions of  other
       libraries  that  are similarly thread unsafe, it could conflict with any other thread that
       uses these other libraries.

       If you are initializing libcurl from a Windows DLL  you  should  not  initialize  it  from
       DllMain or a static initializer because Windows holds the loader lock during that time and
       it could cause a deadlock.

       See the description in libcurl(3) of global environment requirements for details of how to
       use this function.

FLAGS

       CURL_GLOBAL_ALL
            Initialize    everything    possible.    This    sets    all    known   bits   except
            CURL_GLOBAL_ACK_EINTR.

       CURL_GLOBAL_SSL
            Initialize SSL

       CURL_GLOBAL_WIN32
            Initialize the Win32 socket libraries.

       CURL_GLOBAL_NOTHING
            Initialise nothing extra. This sets no bit.

       CURL_GLOBAL_DEFAULT
            A sensible default. It will init both SSL and  Win32.  Right  now,  this  equals  the
            functionality of the CURL_GLOBAL_ALL mask.

       CURL_GLOBAL_ACK_EINTR
            When  this flag is set, curl will acknowledge EINTR condition when connecting or when
            waiting for data.  Otherwise, curl  waits  until  full  timeout  elapses.  (Added  in
            7.30.0)

RETURN VALUE

       If  this function returns non-zero, something went wrong and you cannot use the other curl
       functions.

SEE ALSO

       curl_global_init_mem(3), curl_global_cleanup(3), curl_easy_init(3) libcurl(3)