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/*
* lsfd(1) - list file descriptors
*
* Copyright (C) 2021-2026 Red Hat, Inc. All rights reserved.
* Written by Masatake YAMATO <yamato@redhat.com>
*
* Very generally based on lsof(8) by Victor A. Abell <abe@purdue.edu>
* It supports multiple OSes. lsfd specializes to Linux.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lsfd.h"
/*
* Error classes
*/
/* get_errno_name() --- the private replacement of strerrorname_np(3).
* Some platforms don't have strerrorname_np.
*
* Mainly copied from misc-utils/enosys.c.
*/
struct errno_s {
const char *const name;
long number;
};
static const struct errno_s errnos[] = {
#define UL_ERRNO(name, nr) { name, nr },
#include "errnos.h"
#undef UL_ERRNO
};
static const char *get_errno_name(int ern)
{
if (!ARRAY_SIZE(errnos))
return NULL;
for (size_t i = 0; i < ARRAY_SIZE(errnos); i ++) {
if (errnos[i].number == ern)
return errnos[i].name;
}
return NULL;
}
static bool error_fill_column(struct proc *proc __attribute__((__unused__)),
struct file *file,
struct libscols_line *ln,
int column_id,
size_t column_index)
{
char *str = NULL;
const char *ename;
switch(column_id) {
case COL_TYPE:
if (scols_line_set_data(ln, column_index, "ERROR"))
err(EXIT_FAILURE, _("failed to add output data"));
return true;
case COL_SOURCE:
ename = get_errno_name(file->error.number);
if (ename)
xasprintf(&str, "%s:%s",
file->error.syscall, ename);
else
xasprintf(&str, "%s:unknown(%d)",
file->error.syscall, file->error.number);
if (scols_line_refer_data(ln, column_index, str))
err(EXIT_FAILURE, _("failed to add output data"));
return true;
default:
return false;
}
}
static void error_file_free_content(struct file *file)
{
free(file->name); /* NULL is acceptable. */
}
static const struct file_class error_class = {
.super = &abst_class,
.size = sizeof(struct file),
.free_content = error_file_free_content,
.fill_column = error_fill_column,
};
static bool readlink_error_fill_column(struct proc *proc __attribute__((__unused__)),
struct file *file __attribute__((__unused__)),
struct libscols_line *ln __attribute__((__unused__)),
int column_id,
size_t column_index __attribute__((__unused__)))
{
switch(column_id) {
case COL_NAME:
case COL_KNAME:
return true;
default:
return false;
}
}
const struct file_class readlink_error_class = {
.super = &error_class,
.size = sizeof(struct file),
.fill_column = readlink_error_fill_column,
};
const struct file_class stat_error_class = {
.super = &error_class,
.size = sizeof(struct file),
};
bool is_error_object(struct file *f)
{
const struct file_class *c;
assert(f);
c = f->class;
while (c) {
if (c == &error_class)
return true;
c = c->super;
}
return false;
}
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