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New file.

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1998-07-21  Martin Baulig  <martin@home-of-linux.org>

	* doc/ChangeLog: New file.

	* sysdeps/kernel/*.c: Using `glibtop_error_io_r' instead
	of `glibtop_error_r'.

	* sysdeps/kernel/proclist.c: Now using the table () function, too.
	This means that currently the table () function can fetch all
	information for libgtop and you can even unmount /proc !
This commit is contained in:
Martin Baulig
1998-07-21 21:13:13 +00:00
committed by Martin Baulig
parent 5a1fa089f3
commit 7efcda3082
17 changed files with 58 additions and 133 deletions
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108
sysdeps/kernel/proclist.c
View File

@@ -19,14 +19,11 @@
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <config.h>
#include <glibtop.h>
#include <glibtop/xmalloc.h>
#include <glibtop/proclist.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <ctype.h>
#include "kernel.h"
static const unsigned long _glibtop_sysdeps_proclist =
(1 << GLIBTOP_PROCLIST_TOTAL) + (1 << GLIBTOP_PROCLIST_NUMBER) +
@@ -51,105 +48,24 @@ static const unsigned long _glibtop_sysdeps_proclist =
unsigned *
glibtop_get_proclist_s (glibtop *server, glibtop_proclist *buf)
{
DIR *proc;
struct dirent *entry;
char buffer [BUFSIZ];
unsigned count, total, pid;
unsigned pids [BLOCK_COUNT], *pids_chain = NULL;
unsigned pids_size = 0, pids_offset = 0, new_size;
struct stat statb;
int len, i, ok;
union table tbl;
unsigned *pids_chain;
glibtop_init_r (&server, 0, 0);
memset (buf, 0, sizeof (glibtop_proclist));
proc = opendir ("/proc");
if (!proc) return NULL;
/* read every every entry in /proc */
for (count = total = 0, entry = readdir (proc); entry; entry = readdir (proc)) {
ok = 1; len = strlen (entry->d_name);
/* does it consist entirely of digits? */
for (i = 0; i < len; i++)
if (!isdigit (entry->d_name [i])) ok = 0;
if (!ok) continue;
/* convert it in a number */
if (sscanf (entry->d_name, "%u", &pid) != 1) continue;
/* is it really a directory? */
sprintf (buffer, "/proc/%d", pid);
if (stat (buffer, &statb)) continue;
if (!S_ISDIR (statb.st_mode)) continue;
/* Fine. Now we first try to store it in pids. If this buffer is
* full, we copy it to the pids_chain. */
if (count >= BLOCK_COUNT) {
/* The following call to glibtop_realloc will be equivalent to
* glibtop_malloc if pids_chain is NULL. We just calculate the
* new size and copy pids to the beginning of the newly allocated
* block. */
new_size = pids_size + BLOCK_SIZE;
pids_chain = glibtop_realloc_r (server, pids_chain, new_size);
memcpy (pids_chain + pids_offset, pids, BLOCK_SIZE);
pids_size = new_size;
pids_offset += BLOCK_COUNT;
count = 0;
}
/* pids is now big enough to hold at least one single pid. */
pids [count++] = pid;
total++;
}
closedir (proc);
/* count is only zero if an error occured (one a running Linux system, we
* only have at least one single process). */
if (!count) return NULL;
/* The following call to glibtop_realloc will be equivalent to
* glibtop_malloc if pids_chain is NULL. We just calculate the
* new size and copy pids to the beginning of the newly allocated
* block. */
new_size = pids_size + count * sizeof (unsigned);
pids_chain = glibtop_realloc_r (server, pids_chain, new_size);
memcpy (pids_chain + pids_offset, pids, count * sizeof (unsigned));
pids_size = new_size;
pids_offset += BLOCK_COUNT;
/* Since everything is ok now, we can set buf->flags, fill in the remaining fields
and return pids_chain. */
buf->flags = _glibtop_sysdeps_proclist;
if (table (TABLE_PROCLIST, &tbl, NULL))
glibtop_error_io_r (server, "table(TABLE_PROCLIST)");
buf->size = sizeof (unsigned);
buf->number = total;
buf->number = tbl.proclist.nr_tasks;
buf->total = total * sizeof (unsigned);
buf->total = buf->number * sizeof (unsigned);
pids_chain = glibtop_malloc_r (server, buf->total);
memcpy (pids_chain, tbl.proclist.pids, buf->total);
return pids_chain;
}