import Options
import sys

def set_options(opt):
  pass
  #opt.tool_options('compiler_cc')

def configure(conf):
  print "--- libeio ---"
  #conf.check_tool('compiler_cc')

  conf.check(lib='pthread', uselib_store='PTHREAD')
  conf.check_cc(lib="pthread", header_name="pthread.h", function_name="pthread_create", mandatory=True)
  if not sys.platform.startswith("cygwin"):
    conf.check_cc(lib="pthread", header_name="pthread.h", function_name="pthread_atfork", mandatory=True)
  else:
    conf.check_cc(lib="pthread", header_name="unistd.h", function_name="pthread_atfork", mandatory=True)

  conf.check_cc(msg="Checking for futimes(2)", define_name="HAVE_FUTIMES", fragment="""
    #include <sys/types.h>
    #include <sys/time.h>
    #include <utime.h>
    struct timeval tv[2];
    int res;
    int fd;
    int main(void)
    {
       res = futimes (fd, tv);
       return 0;
    }
  """)

  conf.check_cc(msg="Checking for readahead(2)", define_name="HAVE_READAHEAD", fragment="""
    #include <fcntl.h>
    int main(void)
    {
       int fd = 0;
       size_t count = 2;
       ssize_t res;
       res = readahead (fd, 0, count);
       return 0;
    }
  """)

  conf.check_cc(msg="Checking for fdatasync(2)", define_name="HAVE_FDATASYNC", fragment="""
    #include <unistd.h>
    int main(void)
    {
       int fd = 0;
       fdatasync (fd);
       return 0;
    }
  """)

  conf.check_cc(msg="Checking for pread(2) and pwrite(2)", define_name="HAVE_PREADWRITE", fragment="""
    #include <unistd.h>
    int main(void)
    {
       int fd = 0;
       size_t count = 1;
       char buf;
       off_t offset = 1;
       ssize_t res;
       res = pread (fd, &buf, count, offset);
       res = pwrite (fd, &buf, count, offset);
       return 0;
    }
  """)

  conf.check_cc(msg="Checking for sendfile(2)" , define_name="HAVE_SENDFILE" , fragment=""" 
    # include <sys/types.h>
    #if __linux
    # include <sys/sendfile.h>
    #elif __FreeBSD__ || defined(__APPLE__)
    # include <sys/socket.h>
    # include <sys/uio.h>
    #elif __hpux
    # include <sys/socket.h>
    #else
    # error unsupported architecture
    #endif
    int main(void)
    {
       int fd = 0;
       off_t offset = 1;
       size_t count = 2;
       ssize_t res;
    #if __linux
       res = sendfile (fd, fd, offset, count);
    #elif __FreeBSD__
       res = sendfile (fd, fd, offset, count, 0, &offset, 0);
    #elif __APPLE__
       res = sendfile (fd, fd, offset, &offset, 0, 0);
    #elif __hpux
       res = sendfile (fd, fd, offset, count, 0, 0);
    #endif
       return 0;
    }
  """)

  conf.env.append_value("CCFLAGS", "-D_GNU_SOURCE")
  conf.check_cc(msg="Checking for sync_file_range(2) ", fragment="""
    #include <fcntl.h>
    int main(void)
    {
       int fd = 0;
       off64_t offset = 1;
       off64_t nbytes = 1;
       unsigned int flags = SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER;
       ssize_t res;
       res = sync_file_range (fd, offset, nbytes, flags);
       return 0;
    }
  """, define_name="HAVE_SYNC_FILE_RANGE")

def build(bld):
  libeio = bld.new_task_gen("cc")
  libeio.source = "eio.c"
  libeio.target = 'eio'
  libeio.name = 'eio'
  libeio.includes = '. ../..'
  libeio.uselib = "PTHREAD"
  libeio.install_path = None
  if bld.env["USE_DEBUG"]:
    libeio.clone("debug");
  bld.install_files('${PREFIX}/include/node/', 'eio.h');