This means that the full executable path is always available.
- exec_elf.c: use p->path to set AT_SUN_EXECNAME, and since this is
always set, do so unconditionally.
- kern_exec.c: simplify pathexec, use kmem_strfree where appropriate
and set p->p_path
- kern_exit.c: free p->p_path
- kern_fork.c: set p->p_path for the child.
- kern_proc.c: use p->p_path to return the executable pathname; the
NULL check for p->p_path, should be a KASSERT?
- exec.h: gc ep_path, it is not used anymore
- param.h: bump version, 'struct proc' size change
TODO:
1. reference count the path string, to save copy at fork and free
just before exec?
2. canonicalize the pathname by changing namei() to LOCKPARENT
vnode and then using getcwd() on the parent directory?
This is a legacy interface from 4.4BSD, and it was
introduced to overcome shortcomings of ptrace(2) at that time, which are
no longer relevant (performance). Today /proc/#/ctl offers a narrow
subset of ptrace(2) commands and is not applicable for modern
applications use beyond simplistic tracing scenarios.
This removal will simplify kernel internals. Users will still be able to
use all the other /proc files.
This change won't affect other procfs files neither Linux compat
features within mount_procfs(8). /proc/#/ctl isn't available on Linux.
Remove:
- /proc/#/ctl from mount_procfs(8)
- P_FSTRACE note from the documentation of ps(1)
- /proc/#/ctl and filesystem tracing documentation from mount_procfs(8)
- KAUTH_REQ_PROCESS_PROCFS_CTL documentation from kauth(9)
- source code file miscfs/procfs/procfs_ctl.c
- PFSctl and procfs_doctl() from sys/miscfs/procfs/procfs.h
- KAUTH_REQ_PROCESS_PROCFS_CTL from sys/sys/kauth.h
- PSL_FSTRACE (0x00010000) from sys/sys/proc.h
- P_FSTRACE (0x00010000) from sys/sys/sysctl.h
Reduce code complexity after removal of this functionality.
Update TODO.ptrace accordingly: remove two entries about /proc tracing.
Do not keep legacy notes as comments in the headers about removed
PSL_FSTRACE / P_FSTRACE, as this interface had little number of users
(close or equal to zero).
Proposed on tech-kern@.
All filesystem tracing utility users are encouraged to switch to ptrace(2).
Sponsored by <The NetBSD Foundation>
This removes dead code introduced with the following commit:
date: 2012-07-27 22:52:49 +0200; author: christos; state: Exp; lines: +8 -2;
revert racy vfork() parent-blocking-before-child-execs-or-exits code.
ok rmind
Only change it when we are being permanently reparented to init. Since
p_ppid is only used as a cached value to retrieve the parent's process id
from userland, this change makes it correct at all times. Idea from kre@
Revert specialized logic from getpid/getppid now that it is not needed.
Revert 1.264 - that was intended to fix 51600, but didn't, it just
hid the problem, and caused 51606. This fixes 51606.
Handle waiting on a process that has been detatched from its parent
because of being ptrace'd by some other process. This fixes 51600.
("handle" here means that the wait() hangs, or with WNOHANG, returns 0,
we cannot actually wait on a process that is not currently an attached
child.)
Note: the detatched process waiting is not yet perfect (it fails to
take account of options like WALLSIG and WALTSIG) - suport for those
(that is, ignoring a detatched child that one of those options will
later cause to be ignored when the process is re-attached.)
For now, for ither than when waiting for a specific process ID, when
a process does a wait() sys call (any of them), has no applicable
children attached that can be returned, and has at least one detatched
child, then we do a linear search of all processes to look for a
suitable detatched child. This is likely to be slow - but very rare.
Eventually it might be better to keep a list of detatched children
per process.
on context) into:
1. p_xexit: exit code
2. p_xsig: signal number
3. p_sflag & WCOREFLAG bit to indicated that the process core-dumped.
Fix the documentation of the flag bits in <sys/proc.h>
value, and update its parent's p_nstopchild value when marking the
process's p_stat to SSTOP. The process needed to be SACTIVE to get
here, so this transition represents an additional process for which
the parent needs to wait.
Fixes PR kern/50308
Pullups will be requested for:
NetBSD-7, -6, -6-0, -6-1, -5, -5-0, -5-1, and -5-2
of reaping the process (nor any other children), the process wil get
reparented to init. Since the state of the exiting process at this point
is SDEAD, proc_reparent() will not update either the old or new parent's
p_nstopchild counters.
This change causes both old and new parents to be properly updated.
Fixes PR kern/50300
Pullups will be requested for:
NetBSD-7, -6, -6-0, -6-1, -5, -5-0, -5-1, and -5-2
can named the same as those on other platforms.
For example, proc:::exec-success, not proc:::exec_success.
Implementation follows the same basic principle as FreeBSD's; add
another field to the SDT_PROBE_DEFINE macro which is the name
as exposed to userland.
in a case of process exit. Necessary to re-flag all LWPs for exit, as their
state might have changed or new LWPs spawned.
Should fix PR/46168 and PR/46402.
Now I can follow which process is which in this routine.
If I jiggle the whitespace so line numbers don't change, there is no
change in the output of `objdump -d kern_exit.o' for amd64.
ok abp
- always provide a vmspace for the new proc, initially borrowing from proc0
(this part fixes PR 46286)
- increase parallelism between parent and child if arguments allow this,
avoiding a potential deadlock on exec_lock
- add a new flag for userland to request old (lockstepped) behaviour for
better error reporting
- adapt test cases to the previous two and add a new variant to test the
diagnostics flag
- fix a few memory (and lock) leaks
- provide netbsd32 compat
Otherwise the child will incorrectly see it is not running on any
CPU. Among other things, this fixes crashes from having
LD_PRELOAD=libpthread.so set in the env.
reviewed by tech-kern
that scheduler locks are special in this regard - adaptive locks cannot
be in the path due to turnstiles. Randomly spotted/reported by uebayasi@.
- Remove unused lwp_relock() and replace lwp_lock_retry() by simplifying
lwp_lock() and sleepq_enter() a little.
- Give alllwp its own cache-line and mark lwp_cache pointer as read-mostly.
OK ad@
- update the linux syscall table for each platform.
- support new-style (NPTL) linux pthreads on all platforms.
clone() with CLONE_THREAD uses 1 process with many LWPs
instead of separate processes.
- move the contents of sys__lwp_setprivate() into a new
lwp_setprivate() and use that everywhere.
- update linux_release[] and linux32_release[] to "2.6.18".
- adjust placement of emul fork/exec/exit hooks as needed
and adjust other emul code to match.
- convert all struct emul definitions to use named initializers.
- change the pid allocator to allow multiple pids to refer to the same proc.
- remove a few fields from struct proc that are no longer needed.
- disable the non-functional "vdso" code in linux32/amd64,
glibc works fine without it.
- fix a race in the futex code where we could miss a wakeup after
a requeue operation.
- redo futex locking to be a little more efficient.
Rename real routines to proc_find() and pgrp_find(), remove PFIND_* flags
and have consistent behaviour. Provide proc_find_raw() for special cases.
Fix memory leak in sysctl_proc_corename().
COMPAT_LINUX: rework ptrace() locking, minimise differences between
different versions per-arch.
Note: while this change adds some formal cosmetics for COMPAT_DARWIN and
COMPAT_IRIX - locking there is utterly broken (for ages).
Fixes PR/43176.
