mark system calls as being MPSAFE:
- Stop conditionally acquiring Giant around system call invocations.
- Remove all of the 'M' prefixes from the master system call files.
- Remove support for the 'M' prefix from the script that generates the
syscall-related files from the master system call files.
- Don't explicitly set SYF_MPSAFE when registering nfssvc.
except for s_family (which is read-only once after it is set when the
structure is created).
- Mark svr4_sys_ioctl(), svr4_sys_getmsg(), and svr4_sys_putmsg() MPSAFE.
Also, call change_dir() instead of doing part of it inline (this now adds
a mac_check_vnode_chdir() call) to match fchdir() and call
mac_check_vnode_chroot() to match chroot(). Also, use the change_root()
function to do the actual change root to match chroot().
Reviewed by: rwatson
- If the WNOWAIT flag isn't specified and either of WEXITED or WTRAPPED is
set, then just call kern_wait() and let it do all the work. This means
that this function no longer has to duplicate the work to teardown
zombies that is done in kern_wait(). Instead, if the above conditions
aren't true, then it uses a simpler loop to implement WNOWAIT and/or
tracing for only stopped or continued processes. This function still
has to duplicate code from kern_wait() for the latter two cases, but
those are much simpler.
- Sync the code to handle the WCONTINUED and WSTOPPED cases with the
equivalent code in kern_wait().
- Fix several places that would return with the proctree lock still held.
- Lock the current process to prevent lost wakeup races when blocking.
ibcs2_getdents(), ibcs2_read(), ogetdirentries(), svr4_sys_getdents(),
and svr4_sys_getdents64() similar to that in getdirentries().
- Mark ibcs2_getdents(), ibcs2_read(), linux_getdents(), linux_getdents64(),
linux_readdir(), ogetdirentries(), svr4_sys_getdents(), and
svr4_sys_getdents64() MPSAFE.
to a copied-in copy of the 'union semun' and a uioseg to indicate which
memory space the 'buf' pointer of the union points to. This is then used
in linux_semctl() and svr4_sys_semctl() to eliminate use of the stackgap.
- Mark linux_ipc() and svr4_sys_semsys() MPSAFE.
audit event identifier associated with each system call, which will
be stored by makesyscalls.sh in the sy_auevent field of struct sysent.
For now, default the audit identifier on all system calls to AUE_NULL,
but in the near future, other BSM event identifiers will be used. The
mapping of system calls to event identifiers is many:one due to
multiple system calls that map to the same end functionality across
compatibility wrappers, ABI wrappers, etc.
Submitted by: wsalamon
Obtained from: TrustedBSD Project
directly. This removes a few more users of the stackgap and also marks
the syscalls using these wrappers MP safe where appropriate.
Tested on: i386 with linux acroread5
Compiled on: i386, alpha LINT
gcc's internal exit() prototypes and the (futile) hackery that we did to
try and avoid warnings. main() was renamed for similar reasons.
Remove an exit related hack from makesyscalls.sh.
opt_global.h and opt_svr4.h, instead of from the command line. This
brings them in-line with most of the rest of the kernel.
svr4_ioctl.c has also failed to compile with debugging for a while
now; fixed by adding systm.h and socketvar.
Some svr4 source files are automatically generated from syscalls.master;
these have been committed as consequential changes, otherwise everyone
will have to "make svr4_sysent.c".
Changes:
sys/svr4/svr4.h include opt_global.h and opt_svr4.h
sys/svr4/svr4_ioctl.c include svr4.h, sys/systm.h and sys/socketvar.h
sys/svr4/svr4_ipc.c include svr4.h
sys/svr4/svr4_resource.c include svr4.h
sys/svr4/svr4_socket.c include svr4.h
sys/svr4/svr4_ttold.c include svr4.h
sys/svr4/syscalls.master include svr4.h
sys/svr4/svr4_syscallnames.c dependent on syscalls.master
sys/svr4/svr4_sysent.c dependent on syscalls.master
sys/svr4/svr4_syscall.h dependent on syscalls.master
sys/svr4/svr4_proto.h dependent on syscalls.master
sys/modules/svr4/Makefile create opt_global.h and opt_svr4.h
phk's script walked through .c and .h files, but some of the ones on
the list are actually derived from sys/svr4/syscalls.master. Make
the necessary changes here and the others will implicitly follow...
Submitted by: phk
