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/*
* lsfd-fifo.c - handle associations opening fifo objects
*
* Copyright (C) 2021 Red Hat, Inc. All rights reserved.
* Written by Masatake YAMATO <yamato@redhat.com>
*
* 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"
struct fifo {
struct file file;
struct ipc_endpoint endpoint;
};
struct fifo_ipc {
struct ipc ipc;
ino_t ino;
};
static inline char *fifo_xstrendpoint(struct file *file)
{
char *str = NULL;
xasprintf(&str, "%d,%s,%d%c%c",
file->proc->pid, file->proc->command, file->association,
(file->mode & S_IRUSR)? 'r': '-',
(file->mode & S_IWUSR)? 'w': '-');
return str;
}
static bool fifo_fill_column(struct proc *proc __attribute__((__unused__)),
struct file *file,
struct libscols_line *ln,
int column_id,
size_t column_index,
const char *uri __attribute__((__unused__)))
{
char *str = NULL;
switch(column_id) {
case COL_TYPE:
if (scols_line_set_data(ln, column_index, "FIFO"))
err(EXIT_FAILURE, _("failed to add output data"));
return true;
case COL_SOURCE:
if (major(file->stat.st_dev) == 0
&& strncmp(file->name, "pipe:", 5) == 0) {
str = xstrdup("pipefs");
break;
}
return false;
case COL_ENDPOINTS: {
struct fifo *this = (struct fifo *)file;
struct list_head *e;
foreach_endpoint(e, this->endpoint) {
char *estr;
struct fifo *other = list_entry(e, struct fifo, endpoint.endpoints);
if (this == other)
continue;
if (str)
xstrputc(&str, '\n');
estr = fifo_xstrendpoint(&other->file);
xstrappend(&str, estr);
free(estr);
}
if (!str)
return false;
break;
}
default:
return false;
}
if (!str)
err(EXIT_FAILURE, _("failed to add output data"));
if (scols_line_refer_data(ln, column_index, str))
err(EXIT_FAILURE, _("failed to add output data"));
return true;
}
static unsigned int fifo_get_hash(struct file *file)
{
return (unsigned int)(file->stat.st_ino % UINT_MAX);
}
static bool fifo_is_suitable_ipc(struct ipc *ipc, struct file *file)
{
return ((struct fifo_ipc *)ipc)->ino == file->stat.st_ino;
}
static const struct ipc_class *fifo_get_ipc_class(struct file *file __attribute__((__unused__)))
{
static const struct ipc_class fifo_ipc_class = {
.size = sizeof(struct fifo_ipc),
.get_hash = fifo_get_hash,
.is_suitable_ipc = fifo_is_suitable_ipc,
.free = NULL,
};
return &fifo_ipc_class;
}
static void fifo_initialize_content(struct file *file)
{
struct fifo *fifo = (struct fifo *)file;
struct ipc *ipc;
unsigned int hash;
init_endpoint(&fifo->endpoint);
ipc = get_ipc(file);
if (ipc)
goto link;
ipc = new_ipc(fifo_get_ipc_class(file));
((struct fifo_ipc *)ipc)->ino = file->stat.st_ino;
hash = fifo_get_hash(file);
add_ipc(ipc, hash);
link:
add_endpoint(&fifo->endpoint, ipc);
}
const struct file_class fifo_class = {
.super = &file_class,
.size = sizeof(struct fifo),
.fill_column = fifo_fill_column,
.initialize_content = fifo_initialize_content,
.free_content = NULL,
.get_ipc_class = fifo_get_ipc_class,
};
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