I looked into the SF-bug [ 1012521 ] getUserEntryForID dies where a reentrant
function from libc would cause an illegal instruction. First, I thought the
maybe we'd forgotten to pass -D_POSIX_PTHREAD_SEMANTICS, but it's there after all.
It looks like something doesn't work right when Solaris wraps the reentrant
functions in the following way:
<pwd.h> does something along the lines of
static int
getpwuid_r(__uid, __pwd, __buf, __len, __res)
uid_t __uid;
struct passwd *__pwd;
char *__buf;
int __len;
struct passwd **__res;
{
extern int __posix_getpwuid_r();
return (__posix_getpwuid_r(__uid, __pwd, __buf, __len, __res));
}
System/Posix/User.raw_s looks like this:
.type getpwuid_r,#function (*)
.proc 04
getpwuid_r:
!#PROLOGUE# 0 (*)
save %sp, -112, %sp (*)
!#PROLOGUE# 1 (*)
mov %i0, %o0
mov %i1, %o1
mov %i2, %o2
mov %i3, %o3
call __posix_getpwuid_r, 0
mov %i4, %o4
ret (*)
restore %g0, %o0, %o0 (*)
.LLfe6:
.size getpwuid_r,.LLfe6-getpwuid_r (*)
.type getpwnam_r,#function (*)
.proc 04
getpwnam_r:
...
The (*) marked lines get removed by the mangler. Nothing gets inserted. Judging by
gdb's output
(the getpwnam_r doesn't really make sense)
#0 0xff317cac in __posix_getpwuid_r () from /usr/lib/libc.so.1
#1 0x12110 in getpwnam_r ()
#2 0x1b1374 in schedule (mainThread=0x20a748, initialCapability=0xff1c0000) at
Schedule.c:912
it looks like execution of getpwuid_r falls through to getpwnam_r:
The funny thing is, if I write my own wrapper my_getpwuid_r which simply
calls getpwuid_r from cbits/HsUnix.c and use this wrapper from User.hsc,
I get a working program which doesn't SIGILL. The C-bit of course has retained the
ret/restore
combination since it isn't mangled.
Also, I get the following warnings:
../../ghc/compiler/ghc-inplace -H32m -O0 -W -fno-warn-unused-matches
-fwarn-unused-imports -liberty -Iinclude -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT
-package-name unix -O -dcore-lint -W -fno-warn-unused-matches -fwarn-unused-imports
-keep-hc-files -package base -c System/Posix/User.hs -o System/Posix/User.o -ohi
System/Posix/User.hi
Warning: retaining unknown function `asctime_r' in output from C compiler
Warning: retaining unknown function `ctime_r' in output from C compiler
Warning: retaining unknown function `getlogin_r' in output from C compiler
Warning: retaining unknown function `ttyname_r' in output from C compiler
Warning: retaining unknown function `sigwait' in output from C compiler
Warning: retaining unknown function `getpwuid_r' in output from C compiler
Warning: retaining unknown function `getpwnam_r' in output from C compiler
Warning: retaining unknown function `getgrgid_r' in output from C compiler
Warning: retaining unknown function `getgrnam_r' in output from C compiler
Can somebody make heads and tails out of this? If this proves non-trivial to fix,
I could move all affected functions into a cbit...
--
Volker Stolz * http://www-i2.informatik.rwth-aachen.de/stolz/ * PGP * S/MIME
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