9c9ad03d60
1998-06-07 Martin Baulig <martin@home-of-linux.org> * sysdeps/linux/glibtop_machine.h: New file. * sysdeps/linux/*.c: Performance optimizations. We now use `open' and `read' instead of `fopen' and `fscanf'.
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/* $Id$ */
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/* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the Gnome Top Library.
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Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.
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The Gnome Top Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The Gnome Top Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <config.h>
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#include <glibtop/error.h>
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#include <glibtop/mem.h>
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static const unsigned long _glibtop_sysdeps_mem =
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(1 << GLIBTOP_MEM_TOTAL) + (1 << GLIBTOP_MEM_USED) +
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(1 << GLIBTOP_MEM_FREE) + (1 << GLIBTOP_MEM_SHARED) +
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(1 << GLIBTOP_MEM_BUFFER) + (1 << GLIBTOP_MEM_CACHED) +
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(1 << GLIBTOP_MEM_USER);
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#define FILENAME "/proc/meminfo"
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/* Provides information about memory usage. */
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void
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glibtop_get_mem_s (glibtop *server, glibtop_mem *buf)
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{
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char buffer [BUFSIZ];
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int fd = 0, ret;
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glibtop_init_r (&server, 0, 0);
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memset (buf, 0, sizeof (glibtop_mem));
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buf->flags = _glibtop_sysdeps_mem;
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#ifdef GLIBTOP_CACHE_OPEN
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fd = server->machine.fd_meminfo;
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#endif
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if (fd == 0) {
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fd = open (FILENAME, O_RDONLY);
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if (fd == -1)
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glibtop_error_r (server, "open (%s): %s",
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FILENAME, strerror (errno));
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} else {
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lseek (fd, 0, SEEK_SET);
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}
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ret = read (fd, buffer, BUFSIZ);
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if (ret == -1)
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glibtop_error_r (server, "read (%s): %s",
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FILENAME, strerror (errno));
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sscanf (buffer, "%*[^\n]\nMem: %lu %lu %lu %lu %lu %lu\n",
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&buf->total, &buf->used, &buf->free, &buf->shared,
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&buf->buffer, &buf->cached);
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buf->user = buf->total - buf->free - buf->shared - buf->buffer;
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#ifdef GLIBTOP_CACHE_OPEN
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server->machine.fd_meminfo = fd;
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#else
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close (fd);
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#endif
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}
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