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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'.
This commit is contained in:
Martin Baulig
1998-06-07 20:38:02 +00:00
committed by Martin Baulig
parent c84923132a
commit 9c9ad03d60
13 changed files with 456 additions and 199 deletions
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32
sysdeps/linux/loadavg.c
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@@ -20,17 +20,21 @@
Boston, MA 02111-1307, USA. */
#include <config.h>
#include <glibtop/error.h>
#include <glibtop/loadavg.h>
static const unsigned long _glibtop_sysdeps_loadavg =
(1 << GLIBTOP_LOADAVG_LOADAVG);
#define FILENAME "/proc/loadavg"
/* Provides load load averange. */
void
glibtop_get_loadavg_s (glibtop *server, glibtop_loadavg *buf)
{
FILE *f;
char buffer [BUFSIZ];
int fd = 0, ret;
glibtop_init_r (&server, 0, 0);
@@ -38,11 +42,29 @@ glibtop_get_loadavg_s (glibtop *server, glibtop_loadavg *buf)
buf->flags = _glibtop_sysdeps_loadavg;
f = fopen ("/proc/loadavg", "r");
if (!f) return;
#ifdef GLIBTOP_CACHE_OPEN
fd = server->machine.fd_loadavg;
#endif
if (fd == 0) {
fd = open (FILENAME, O_RDONLY);
if (fd == -1)
glibtop_error_r (server, "open (%s): %s",
FILENAME, strerror (errno));
} else {
lseek (fd, 0, SEEK_SET);
}
fscanf (f, "%lf %lf %lf\n",
ret = read (fd, buffer, BUFSIZ);
if (ret == -1)
glibtop_error_r (server, "read (%s): %s",
FILENAME, strerror (errno));
sscanf (buffer, "%lf %lf %lf\n",
&buf->loadavg [0], &buf->loadavg [1], &buf->loadavg [2]);
fclose (f);
#ifdef GLIBTOP_CACHE_OPEN
server->machine.fd_loadavg = fd;
#else
close (fd);
#endif
}