Ion Gaztanaga wrote:
I wasn't expecting permission problems, though ;-) Could you tell me a shared memory name that a user could use successfully in HP-UX?
It is not just HP-UX. You would've had the same problem on Tru64 or VMS if the codepath that is taken on HP-UX was executed on these platforms -- see below. [ As a side remark: your check for whether the platform supports shared memory objects assumes that this functionality is available only if the macro _POSIX_SHARED_MEMORY_OBJECTS is defined with a value greater than zero. While this is correct assumption for X/Open Issue 6: The Open Group Base Specifications Issue 6 IEEE Std 1003.1, 2004 Edition, it is not a correct assumption for X/Open Issue 5: The Single UNIX Specification, Version 2, also known as UNIX 98. In UNIX 98, the macro can be defined with any value -- see <http://www.opengroup.org/onlinepubs/007908799/xsh/unistd.h.html> As I said in the previous mail, Tru64 defines _POSIX_SHARED_MEMORY_OBJECTS as an empty string and your check for shared memory objects availability fails on this platform, which is good in a sense :-) ] To answer your question, I think, that prepending "/tmp/boost_interprocess/" to the name is a good solution. You already do it on platforms which fail your shared memory objects availability check. Thanks, Boris HP-UX ----- bash-2.03$ cc -V cc: HP C/aC++ B3910B A.06.14 [Feb 22 2007] bash-2.03$ cc x.c && a.out shm_open: Permission denied bash-2.03$ Tru64 ----- cxxosf.zko.hp.com> cc -V Compaq C V6.5-207 (dtk) on Compaq Tru64 UNIX V5.1B (Rev. 2650) Compiler Driver V6.5-207 (dtk) (dtk) cc Driver cxxosf.zko.hp.com> cc x.c -lrt && a.out shm_open: Permission denied cxxosf.zko.hp.com> VMS --- ICXXC::_1> cc/ver HP C V7.3-018 on OpenVMS IA64 XBPK-O3N ICXXC::_1> define DECC$POSIX_COMPLIANT_PATHNAMES 1 ICXXC::_1> pipe cc x.c ; link x.obj ; run x.exe shm_open: permission denied ICXXC::_1> x.c --- #include <sys/mman.h> #include <fcntl.h> #include <stdio.h> #include <sys/stat.h> int main() { int fd; char *name = "/shm_name"; int oflag = O_RDWR | O_CREAT | O_EXCL; fd = shm_open(name, oflag, S_IRWXO | S_IRWXG | S_IRWXU); if ( fd == -1 ) perror("shm_open"); else { puts("success"); shm_unlink(name); } }