proc_running.c File Reference

Implementaiton of procr filesystem. More...

Functions
static char	__procr_get_task_state_char (int state)
	Returns the character identifying the process state. More...
static ssize_t	__procr_do_cmdline (char *buffer, size_t bufsize, task_struct *task)
	Returns the data for the /proc/<PID>/cmdline file. More...
static ssize_t	__procr_do_stat (char *buffer, size_t bufsize, task_struct *task)
	Returns the data for the /proc/<PID>/stat file. More...
static ssize_t	__procr_read (vfs_file_t *file, char *buffer, off_t offset, size_t nbyte)
	Performs a read of files inside the /proc/<PID>/ folder. More...
int	procr_create_entry_pid (task_struct *entry)
	Create the entire procfs entry tree for the give process. More...
int	procr_destroy_entry_pid (task_struct *entry)
	Destroy the entire procfs entry tree for the give process. More...

Variables
static vfs_sys_operations_t	procr_sys_operations
	Filesystem general operations. More...
static vfs_file_operations_t	procr_fs_operations
	Filesystem file operations. More...

Detailed Description

Implementaiton of procr filesystem.

Copyright

(c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.

Function Documentation

__procr_do_cmdline()

static ssize_t __procr_do_cmdline ( char *  buffer, size_t  bufsize, task_struct *  task  )

inlinestatic

Returns the data for the /proc/<PID>/cmdline file.

Parameters

buffer	the buffer where the data should be placed.
bufsize	the size of the buffer.
task	the task associated with the /proc/<PID> folder.

Returns

size of the written data in buffer.

__procr_do_stat()

static ssize_t __procr_do_stat ( char *  buffer, size_t  bufsize, task_struct *  task  )

inlinestatic

Returns the data for the /proc/<PID>/stat file.

Parameters

buffer	the buffer where the data should be placed.
bufsize	the size of the buffer.
task	the task associated with the /proc/<PID> folder.

Returns

size of the written data in buffer.

__procr_get_task_state_char()

static char __procr_get_task_state_char ( int  state )

inlinestatic

Returns the character identifying the process state.

Parameters

state

the process state.

Returns

a character describing the state.

R Running S Sleeping in an interruptible wait D Waiting in uninterruptible disk sleep Z Zombie T Stopped t Tracing stop X Dead

__procr_read()

static ssize_t __procr_read ( vfs_file_t *  file, char *  buffer, off_t  offset, size_t  nbyte  )

inlinestatic

Performs a read of files inside the /proc/<PID>/ folder.

Parameters

file	is the /proc/<PID>/ folder, thus, it should be a proc_dir_entry_t data.
buffer	buffer where the read content must be placed.
offset	offset from which we start reading from the file.
nbyte	the number of bytes to read.

Returns

The number of bytes we read.

procr_create_entry_pid()

int procr_create_entry_pid

(

task_struct *

entry

)

Create the entire procfs entry tree for the give process.

Parameters

entry

Pointer to the task_struct of the process.

Returns

0 if succeed, or -errno in case of error.

procr_destroy_entry_pid()

int procr_destroy_entry_pid

(

task_struct *

entry

)

Destroy the entire procfs entry tree for the give process.

Parameters

entry

Pointer to the task_struct of the process.

Returns

0 if succeed, or -errno in case of error.

Variable Documentation

procr_fs_operations

vfs_file_operations_t procr_fs_operations

static

Initial value:

= {
    .open_f     = NULL,
    .unlink_f   = NULL,
    .close_f    = NULL,
    .read_f     = __procr_read,
    .write_f    = NULL,
    .lseek_f    = NULL,
    .stat_f     = NULL,
    .ioctl_f    = NULL,
    .getdents_f = NULL,
    .readlink_f = NULL,
}

Filesystem file operations.

procr_sys_operations

vfs_sys_operations_t procr_sys_operations

static

Initial value:

= {
    .mkdir_f   = NULL,
    .rmdir_f   = NULL,
    .stat_f    = NULL,
    .creat_f   = NULL,
    .symlink_f = NULL,
}

Filesystem general operations.