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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/cpu.c
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@@ -20,6 +20,7 @@
Boston, MA 02111-1307, USA. */
#include <config.h>
#include <glibtop/error.h>
#include <glibtop/cpu.h>
static const unsigned long _glibtop_sysdeps_cpu =
@@ -29,10 +30,13 @@ static const unsigned long _glibtop_sysdeps_cpu =
/* Provides information about cpu usage. */
#define FILENAME "/proc/stat"
void
glibtop_get_cpu_s (glibtop *server, glibtop_cpu *buf)
{
FILE *f;
char buffer [BUFSIZ];
int fd = 0, ret;
glibtop_init_r (&server, 0, 0);
@@ -40,15 +44,33 @@ glibtop_get_cpu_s (glibtop *server, glibtop_cpu *buf)
buf->flags = _glibtop_sysdeps_cpu;
f = fopen ("/proc/stat", "r");
if (!f) return;
#ifdef GLIBTOP_CACHE_OPEN
fd = server->machine.fd_stat;
#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, "cpu %lu %lu %lu %lu\n",
ret = read (fd, buffer, BUFSIZ);
if (ret == -1)
glibtop_error_r (server, "read (%s): %s",
FILENAME, strerror (errno));
sscanf (buffer, "cpu %lu %lu %lu %lu\n",
&buf->user, &buf->nice, &buf->sys, &buf->idle);
buf->total = buf->user + buf->nice + buf->sys + buf->idle;
buf->frequency = 100;
fclose (f);
#ifdef GLIBTOP_CACHE_OPEN
server->machine.fd_stat = fd;
#else
close (fd);
#endif
}