when the same pipe FILE is pclosed()'d in different threads, and to avoid
corrupting the linked list when adding or removing items. The symptoms of
the linked list getting corrupted were pclose() either not finding the pipe
on the list, or the list becoming circular and pclose() looping infinitely.
o Allow callers of m_extadd() to allocate their own reference
m_ext.ref_cnt pointer, rather than having the mbuf system allocate it
with a malloc() in the critical path. This speeds m_extadd() up, and
also simplifies locking (malloc() may need Giant).
A driver or subsystem wishing to take use its own ref counter must
initialize m_ext.ref_cnt to point to its ref counter prior to
calling m_extadd(), and it must use EXT_EXTREF as its external type.
Eg:
m->m_ext.ref_cnt = my_ref_cnt_ptr;
m_extadd(.....,EXT_EXTREF);
Reviewed by: bosko
to Solaris, it is in /usr/libexec) to perform the handing over of tty nodes
to the user being granted the pty.
Submitted by: Ryan Younce <ryany@pobox.com>
Reviewed by: security-officer@, standards@, mike@
positions for the status bits of port a and port b are different. To
avoid needing to know which channel the interrupt handler is working on,
shift the status bits for port a into the port b bit positions, and always
check the port b status bits. This fixes using port b, which I neglected
to test before.
- Remember to update the channel's tty structure from the passed in termios
in the param routine.
- Minor style.
This situation most notably arises in chkprintcap, when a /etc/printcap
entry has an empty rp= attribute. In that case, cgetmatch would enter
an infinite loop if any entry in the file has multiple names.
This causes lpd to hang at boot time on 5.0-DP2 when both conditions
are met (:rp=: and multiple names -- not necessarily on the same entry).
Reviewed by: roberto
code, make the emulator use it.
Rename unsupported_msg() to unimplemented_syscall(). Rename some arguments
for clarity
Fixup grammar.
Requested by: bde
Metricom Ricochet GS modem. Add them here.
# A new umodem appears to be needed to make the sanyo phone work, but that's
# more extensive and will come after coordination.
With a 1 byte transmit fifo, 3 byte receive fifo, and wierd multiplexed I/O
designed for a Z80 cpu, this chip redefines suckage.
Based on the openbsd and netbsd drivers. Only really works as a console,
modem support is not complete since I can't test it.
this was causing filedesc work to be very painful.
In order to make this work split out sigio definitions to thier own header
(sigio.h) which is included from proc.h for the time being.
take pointers to filedesc structures instead of threads. This makes
it more clear that they do not do any voodoo with the thread/proc
or anything other than the filedesc passed in or returned.
Remove some XXX KSE's as this resolves the issue.
is now synchronized by a mutex, whereas access to user maps is still
synchronized by a lockmgr()-based lock. Why? No single type of lock,
including sx locks, meets the requirements of both types of vm map.
Sometimes we sleep while holding the lock on a user map. Thus, a
a mutex isn't appropriate. On the other hand, both lockmgr()-based
and sx locks release Giant when a thread/process blocks during
contention for a lock. This could lead to a race condition in a legacy
driver (that relies on Giant for synchronization) if it attempts to
kmem_malloc() and fails to immediately obtain the lock. Fortunately,
we never sleep while holding a system map lock.
