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Have the kern.file sysctl export xfiles rather than files. The truth is

Browse Source 
out there!

Sponsored by:	DARPA, NAI Labs
This commit is contained in:
Dag-Erling Smørgrav 2002-07-31 12:26:52 +00:00
parent 3072197229
commit aefe27a25c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=101042
1 changed files with 55 additions and 28 deletions
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83
sys/kern/kern_descrip.c
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@ -2040,43 +2040,70 @@ dupfdopen(td, fdp, indx, dfd, mode, error)
static int
sysctl_kern_file(SYSCTL_HANDLER_ARGS)
{
int error;
struct proc *p;
struct filedesc *fdp;
struct file *fp;
struct xfile xf;
int error, n;
sysctl_wire_old_buffer(req, 0);
sx_slock(&filelist_lock);
if (!req->oldptr) {
/*
* overestimate by 10 files
*/
error = SYSCTL_OUT(req, 0, sizeof(filehead) +
(nfiles + 10) * sizeof(struct file));
sx_sunlock(&filelist_lock);
return (error);
}
error = SYSCTL_OUT(req, &filehead, sizeof(filehead));
if (error) {
sx_sunlock(&filelist_lock);
return (error);
}
/*
* followed by an array of file structures
*/
LIST_FOREACH(fp, &filehead, f_list) {
error = SYSCTL_OUT(req, fp, sizeof (struct file));
if (error) {
sx_sunlock(&filelist_lock);
return (error);
n = 16; /* slight overestimate */
sx_slock(&filelist_lock);
LIST_FOREACH(fp, &filehead, f_list) {
/*
* We should grab the lock, but this is an
* estimate, so does it really matter?
*/
/* mtx_lock(fp->f_mtxp); */
n += fp->f_count;
/* mtx_unlock(f->f_mtxp); */
}
sx_sunlock(&filelist_lock);
return (SYSCTL_OUT(req, 0, n * sizeof xf));
}
sx_sunlock(&filelist_lock);
return (0);
error = 0;
bzero(&xf, sizeof xf);
xf.xf_size = sizeof xf;
sx_slock(&allproc_lock);
LIST_FOREACH(p, &allproc, p_list) {
PROC_LOCK(p);
xf.xf_pid = p->p_pid;
xf.xf_uid = p->p_ucred->cr_uid;
if ((fdp = p->p_fd) == NULL) {
PROC_UNLOCK(p);
continue;
}
FILEDESC_LOCK(fdp);
for (n = 0; n < fdp->fd_nfiles; ++n) {
if ((fp = fdp->fd_ofiles[n]) == NULL)
continue;
xf.xf_fd = n;
xf.xf_file = fp;
#define XF_COPY(field) xf.xf_##field = fp->f_##field
XF_COPY(type);
XF_COPY(count);
XF_COPY(msgcount);
XF_COPY(offset);
XF_COPY(data);
XF_COPY(flag);
#undef XF_COPY
error = SYSCTL_OUT(req, &xf, sizeof xf);
if (error)
break;
}
FILEDESC_UNLOCK(fdp);
PROC_UNLOCK(p);
if (error)
break;
}
sx_sunlock(&allproc_lock);
return (error);
}
SYSCTL_PROC(_kern, KERN_FILE, file, CTLTYPE_OPAQUE|CTLFLAG_RD,
0, 0, sysctl_kern_file, "S,file", "Entire file table");
0, 0, sysctl_kern_file, "S,xfile", "Entire file table");
SYSCTL_INT(_kern, KERN_MAXFILESPERPROC, maxfilesperproc, CTLFLAG_RW,
&maxfilesperproc, 0, "Maximum files allowed open per process");