Re: Solution to catching signals without using Lua hooks
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- Subject: Re: Solution to catching signals without using Lua hooks
- From: eugeny gladkih <john@...>
- Date: 2008年1月20日 14:16:34 +0300
>>>>> "PD" == Patrick Donnelly <batrick.donnelly@gmail.com> writes:
PD> lua_newthread(). I haven't run into any issues yet, but I wonder if
PD> this solution has any problems or side effects I don't see?
yep, the first and most important is that malloc() must not be
called in signal handler nor any others libc
functions. furthermore, not all syscalls may be used,
too. please read following:
Async-signal-safe functions
A signal handling routine established by sigaction(2) or signal(2) must
be very careful, since processing elsewhere may be interrupted at some
arbitrary point in the execution of the program. POSIX has the concept
of "safe function". If a signal interrupts the execution of an unsafe
function, and handler calls an unsafe function, then the behavior of
the program is undefined. POSIX.1-2003 requires an implementation to
guarantee that the following functions can be safely called inside a
signal handler:
_Exit(), _exit(), abort(), accept(), access(), aio_error(), aio-
_return(), aio_suspend(), alarm(), bind(), cfgetispeed(), cfget-
ospeed(), cfsetispeed(), cfsetospeed(), chdir(), chmod(), chown(),
clock_gettime(), close(), connect(), creat(), dup(), dup2(), execle(),
execve(), fchmod(), fchown(), fcntl(), fdatasync(), fork(), fpath-
conf(), fstat(), fsync(), ftruncate(), getegid(), geteuid(), getgid(),
getgroups(), getpeername(), getpgrp(), getpid(), getppid(), get-
sockname(), getsockopt(), getuid(), kill(), link(), listen(), lseek(),
lstat(), mkdir(), mkfifo(), open(), pathconf(), pause(), pipe(),
poll(), posix_trace_event(), pselect(), raise(), read(), readlink(),
recv(), recvfrom(), recvmsg(), rename(), rmdir(), select(), sem_post(),
send(), sendmsg(), sendto(), setgid(), setpgid(), setsid(), setsock-
opt(), setuid(), shutdown(), sigaction(), sigaddset(), sigdelset(),
sigemptyset(), sigfillset(), sigismember(), signal(), sigpause(), sig-
pending(), sigprocmask(), sigqueue(), sigset(), sigsuspend(), sleep(),
socket(), socketpair(), stat(), symlink(), sysconf(), tcdrain(),
tcflow(), tcflush(), tcgetattr(), tcgetpgrp(), tcsendbreak(), tcset-
attr(), tcsetpgrp(), time(), timer_getoverrun(), timer_gettime(),
timer_settime(), times(), umask(), uname(), unlink(), utime(), wait(),
waitpid(), write().
--
Yours sincerely, Eugeny.
Doctor Web, Ltd. http://www.drweb.com
+79119997425