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Add a DDB "show files" command to list the current open file list, some

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state about each open file, and identify the first process in the process
table that references the file.  This is helpful in debugging leaks of
file descriptors.

MFC after:	1 week
This commit is contained in:
Robert Watson 2005-11-10 10:42:50 +00:00
parent b89ad281dc
commit b4e507aafa
1 changed files with 73 additions and 0 deletions
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73
sys/kern/kern_descrip.c
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@ -38,6 +38,7 @@
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/systm.h>
@ -69,6 +70,8 @@ __FBSDID("$FreeBSD$");
#include <vm/uma.h>
#include <ddb/ddb.h>
static MALLOC_DEFINE(M_FILEDESC, "filedesc", "Open file descriptor table");
static MALLOC_DEFINE(M_FILEDESC_TO_LEADER, "filedesc_to_leader",
"file desc to leader structures");
@ -2466,6 +2469,76 @@ sysctl_kern_file(SYSCTL_HANDLER_ARGS)
SYSCTL_PROC(_kern, KERN_FILE, file, CTLTYPE_OPAQUE|CTLFLAG_RD,
0, 0, sysctl_kern_file, "S,xfile", "Entire file table");
#ifdef DDB
/*
* For the purposes of debugging, generate a human-readable string for the
* file type.
*/
static const char *
file_type_to_name(short type)
{
switch (type) {
case 0:
return ("zero");
case DTYPE_VNODE:
return ("vnod");
case DTYPE_SOCKET:
return ("sock");
case DTYPE_PIPE:
return ("pipe");
case DTYPE_FIFO:
return ("fifo");
case DTYPE_CRYPTO:
return ("crpt");
default:
return ("unkn");
}
}
/*
* For the purposes of debugging, identify a process (if any, perhaps one of
* many) that references the passed file in its file descriptor array. Return
* NULL if none.
*/
static struct proc *
file_to_first_proc(struct file *fp)
{
struct filedesc *fdp;
struct proc *p;
int n;
LIST_FOREACH(p, &allproc, p_list) {
if (p->p_state == PRS_NEW)
continue;
fdp = p->p_fd;
if (fdp == NULL)
continue;
for (n = 0; n < fdp->fd_nfiles; n++) {
if (fp == fdp->fd_ofiles[n])
return (p);
}
}
return (NULL);
}
DB_SHOW_COMMAND(files, db_show_files)
{
struct file *fp;
struct proc *p;
db_printf("%9s %4s %9s %9s %6s %9s %6s %12s\n", "File", "Type",
"Data", "Flag", "Count", "Vnode", "FPid", "FCmd");
LIST_FOREACH(fp, &filehead, f_list) {
p = file_to_first_proc(fp);
db_printf("%9p %4s %9p 0x%09x %6d %9p %6d %12s\n", fp,
file_type_to_name(fp->f_type), fp->f_data, fp->f_flag,
fp->f_count, fp->f_vnode, p != NULL ? p->p_pid : -1,
p != NULL ? p->p_comm : "-");
}
}
#endif
SYSCTL_INT(_kern, KERN_MAXFILESPERPROC, maxfilesperproc, CTLFLAG_RW,
&maxfilesperproc, 0, "Maximum files allowed open per process");