diff options
Diffstat (limited to 'gnuradio-runtime/lib/gr_vmcircbuf_mmap_tmpfile.cc')
-rw-r--r-- | gnuradio-runtime/lib/gr_vmcircbuf_mmap_tmpfile.cc | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/gnuradio-runtime/lib/gr_vmcircbuf_mmap_tmpfile.cc b/gnuradio-runtime/lib/gr_vmcircbuf_mmap_tmpfile.cc deleted file mode 100644 index 35de64699e..0000000000 --- a/gnuradio-runtime/lib/gr_vmcircbuf_mmap_tmpfile.cc +++ /dev/null @@ -1,197 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2003,2011 Free Software Foundation, Inc. - * - * This file is part of GNU Radio - * - * GNU Radio is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 3, or (at your option) - * any later version. - * - * GNU Radio is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with GNU Radio; see the file COPYING. If not, write to - * the Free Software Foundation, Inc., 51 Franklin Street, - * Boston, MA 02110-1301, USA. - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif -#include <gr_vmcircbuf_mmap_tmpfile.h> -#include <stdexcept> -#include <assert.h> -#include <unistd.h> -#include <stdlib.h> -#ifdef HAVE_SYS_TYPES_H -#include <sys/types.h> -#endif -#ifdef HAVE_SYS_MMAN_H -#include <sys/mman.h> -#endif -#include <fcntl.h> -#include <errno.h> -#include <stdio.h> -#include <string.h> -#include <gr_pagesize.h> -#include <gr_sys_paths.h> - -gr_vmcircbuf_mmap_tmpfile::gr_vmcircbuf_mmap_tmpfile (int size) - : gr_vmcircbuf (size) -{ -#if !defined(HAVE_MMAP) - fprintf (stderr, "gr_vmcircbuf_mmap_tmpfile: mmap or mkstemp is not available\n"); - throw std::runtime_error ("gr_vmcircbuf_mmap_tmpfile"); -#else - - if (size <= 0 || (size % gr_pagesize ()) != 0){ - fprintf (stderr, "gr_vmcircbuf_mmap_tmpfile: invalid size = %d\n", size); - throw std::runtime_error ("gr_vmcircbuf_mmap_tmpfile"); - } - - int seg_fd = -1; - char seg_name[1024]; - - static int s_seg_counter = 0; - - - // open a temporary file that we'll map in a bit later - - while (1){ - snprintf (seg_name, sizeof (seg_name), - "%s/gnuradio-%d-%d-XXXXXX", gr_tmp_path (), getpid (), s_seg_counter); - s_seg_counter++; - - seg_fd = open (seg_name, O_RDWR | O_CREAT | O_EXCL, 0600); - if (seg_fd == -1){ - if (errno == EEXIST) // File already exists (shouldn't happen). Try again - continue; - - char msg[1024]; - snprintf (msg, sizeof (msg), - "gr_vmcircbuf_mmap_tmpfile: open [%s]", seg_name); - perror (msg); - throw std::runtime_error ("gr_vmcircbuf_mmap_tmpfile"); - } - break; - } - - if (unlink (seg_name) == -1){ - perror ("gr_vmcircbuf_mmap_tmpfile: unlink"); - throw std::runtime_error ("gr_vmcircbuf_mmap_tmpfile"); - } - - // We've got a valid file descriptor to a tmp file. - // Now set it's length to 2x what we really want and mmap it in. - - if (ftruncate (seg_fd, (off_t) 2 * size) == -1){ - close (seg_fd); // cleanup - perror ("gr_vmcircbuf_mmap_tmpfile: ftruncate (1)"); - throw std::runtime_error ("gr_vmcircbuf_mmap_tmpfile"); - } - - void *first_copy = mmap (0, 2 * size, - PROT_READ | PROT_WRITE, MAP_SHARED, - seg_fd, (off_t) 0); - - if (first_copy == MAP_FAILED){ - close (seg_fd); // cleanup - perror ("gr_vmcircbuf_mmap_tmpfile: mmap (1)"); - throw std::runtime_error ("gr_vmcircbuf_mmap_tmpfile"); - } - - // unmap the 2nd half - if (munmap ((char *) first_copy + size, size) == -1){ - close (seg_fd); // cleanup - perror ("gr_vmcircbuf_mmap_tmpfile: munmap (1)"); - throw std::runtime_error ("gr_vmcircbuf_mmap_tmpfile"); - } - - // map the first half into the now available hole where the - // second half used to be. - - void *second_copy = mmap ((char *) first_copy + size, size, - PROT_READ | PROT_WRITE, MAP_SHARED, - seg_fd, (off_t) 0); - - if (second_copy == MAP_FAILED){ - munmap(first_copy, size); // cleanup - close (seg_fd); - perror ("gr_vmcircbuf_mmap_tmpfile: mmap (2)"); - throw std::runtime_error ("gr_vmcircbuf_mmap_tmpfile"); - } - - // check for contiguity - if ((char *) second_copy != (char *) first_copy + size){ - munmap(first_copy, size); // cleanup - munmap(second_copy, size); - close (seg_fd); - perror ("gr_vmcircbuf_mmap_tmpfile: non-contiguous second copy"); - throw std::runtime_error ("gr_vmcircbuf_mmap_tmpfile"); - } - - // cut the tmp file down to size - if (ftruncate (seg_fd, (off_t) size) == -1){ - munmap(first_copy, size); // cleanup - munmap(second_copy, size); - close (seg_fd); - perror ("gr_vmcircbuf_mmap_tmpfile: ftruncate (2)"); - throw std::runtime_error ("gr_vmcircbuf_mmap_tmpfile"); - } - - close (seg_fd); // fd no longer needed. The mapping is retained. - - // Now remember the important stuff - - d_base = (char *) first_copy; - d_size = size; -#endif -} - -gr_vmcircbuf_mmap_tmpfile::~gr_vmcircbuf_mmap_tmpfile () -{ -#if defined(HAVE_MMAP) - if (munmap (d_base, 2 * d_size) == -1){ - perror ("gr_vmcircbuf_mmap_tmpfile: munmap (2)"); - } -#endif -} - -// ---------------------------------------------------------------- -// The factory interface -// ---------------------------------------------------------------- - - -gr_vmcircbuf_factory *gr_vmcircbuf_mmap_tmpfile_factory::s_the_factory = 0; - -gr_vmcircbuf_factory * -gr_vmcircbuf_mmap_tmpfile_factory::singleton () -{ - if (s_the_factory) - return s_the_factory; - - s_the_factory = new gr_vmcircbuf_mmap_tmpfile_factory (); - return s_the_factory; -} - -int -gr_vmcircbuf_mmap_tmpfile_factory::granularity () -{ - return gr_pagesize (); -} - -gr_vmcircbuf * -gr_vmcircbuf_mmap_tmpfile_factory::make (int size) -{ - try { - return new gr_vmcircbuf_mmap_tmpfile (size); - } - catch (...){ - return 0; - } -} |