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Gregory Nutt a7265d71c6 This commit adds support for default signal actions for SIGSTOP, SIGSTP, and SIGCONT. Squashed commit of the following: Add procfs support to show stopped tasks. Add nxsig_action() to solve a chicken and egg problem: We needed to use sigaction to set default actions, but sigaction() would refuse to set actions if the default actions could not be caught or ignored. sched/signal: Add configuration option to selectively enabled/disable default signal actions for SIGSTOP/SIGSTP/SIGCONT and SIGKILL/SIGINT. Fix some compilation issues. sched/sched: Okay.. I figured out a way to handle state changes that may occur while they were stopped. If a task/thread was already blocked when SIGSTOP/SIGSTP was received, it will restart in the running state. I will appear that to the task/thread that the blocked condition was interrupt by a signal and returns the EINTR error. sched/group and sched/sched: Finish framework for continue/resume logic. sched/signal: Roughing out basic structure to support task suspend/resume		2018-08-30 10:27:18 -06:00
..
fs_procfs.c	fs/procfs/: Add support for /proc, a convenient way for getting information about the currently running task.	2018-08-18 18:00:23 -06:00
fs_procfscpuload.c	procfs: Most stat() implementations were not initializating the st_atime, st_ctime, and st_mtime fields.	2017-02-15 09:59:09 -06:00
fs_procfsmeminfo.c	Fix a few compilation errors.	2018-04-20 15:55:16 -06:00
fs_procfsproc.c	This commit adds support for default signal actions for SIGSTOP, SIGSTP, and SIGCONT.	2018-08-30 10:27:18 -06:00
fs_procfsuptime.c	Elimate use of the non-standard type systime_t and replace it the equivalent, standard type clock_t	2018-06-16 12:16:13 -06:00
fs_procfsutil.c	fs/procfs: Fix an error in a common function that manages read data.	2018-01-12 18:26:45 -06:00
fs_skeleton.c	procfs skeleton: Some additional, purely cosmetic updates.	2017-02-15 12:47:51 -06:00
Kconfig	fs/procfs: Add a configuration option to disable environment variable info.	2018-08-19 06:36:23 -06:00
Make.defs	fs/procfs: Optimization of previous commits. /proc/umm and proc/progmem are deleted. /proc/kmm is renamed /proc/meminfo and contains the output that was in all three files previously.	2017-11-13 13:33:12 -06:00
README.txt	fs/binfs/README.txt: Add a README file	2013-11-13 16:40:03 -06:00

README.txt

fs/procfs README
================

  This is a tiny procfs file system that allows read-only access to a few
  attributes of a task or thread.  This tiny procfs fs file system can be
  built into the system by enabling:

    CONFIG_FS_PROCFS=y

  It can then be mounted from the NSH command like like:

    nsh> mount -t procfs /proc

Example
=======

  NuttShell (NSH) NuttX-6.31
  nsh> mount -t procfs /proc

  nsh> ls /proc
  /proc:
   0/
   1/

  nsh> ls /proc/1
  /proc/1:
   status
   cmdline

  nsh> cat /proc/1/status
  Name:       init
  Type:       Task
  State:      Running
  Priority:   100
  Scheduler:  SCHED_FIFO
  SigMask:    00000000

  nsh> cat /proc/1/cmdline
  init

  nsh> sleep 100 &
  sleep [2:100]
  nsh> ls /proc
  ls /proc
  /proc:
   0/
   1/
   2/

  nsh> cat /proc/2/cmdline
  <pthread> 0x527420