Module Name:	syssrc
Committed By:	manu
Date:		Sun May  6 19:09:55 UTC 2001

Modified Files:
	syssrc/sys/compat/linux/common: linux_exec.c
	syssrc/sys/compat/osf1: osf1_exec.c
	syssrc/sys/compat/sunos: sunos_exec.c
	syssrc/sys/compat/sunos32: sunos32_exec.c
	syssrc/sys/kern: kern_exec.c
	syssrc/sys/sys: proc.h

Log Message:
Added two flags to emulation packages:

EMUL_BSD_ASYNCIO_PIPE notes that the emulated binaries expect the original
BSD pipe behavior for asynchronous I/O, which is to fire SIGIO on read() and
write(). OSes without this flag do not expect any SIGIO to be fired on
read() and write() for pipes, even when async I/O was requested. As far as
we know, the OSes that need EMUL_BSD_ASYNCIO_PIPE are NetBSD, OSF/1 and
Darwin.

EMUL_NO_SIGIO_ON_READ notes that the emulated binaries that requested
asynchrnous I/O expect the reader process to be notified by a SIGIO, but
not the writer process. OSes without this flag expect the reader and the
writer to be notified when some data has arrived or when some data have been
read. As far as we know, the OSes that need EMUL_NO_SIGIO_ON_READ are Linux
and SunOS.


To generate a diff of this commit:
cvs rdiff -r1.48 -r1.49 syssrc/sys/compat/linux/common/linux_exec.c
cvs rdiff -r1.21 -r1.22 syssrc/sys/compat/osf1/osf1_exec.c
cvs rdiff -r1.29 -r1.30 syssrc/sys/compat/sunos/sunos_exec.c
cvs rdiff -r1.2 -r1.3 syssrc/sys/compat/sunos32/sunos32_exec.c
cvs rdiff -r1.138 -r1.139 syssrc/sys/kern/kern_exec.c
cvs rdiff -r1.126 -r1.127 syssrc/sys/sys/proc.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.