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Full Discussion: Compilation problem with semtimedop
Top Forums Programming Compilation problem with semtimedop Post 302143241 by rimon on Wednesday 31st of October 2007 08:46:33 AM
Old 10-31-2007
Compilation problem with semtimedop
Hi,

I'm porting code from Windows to HP-UX 11, compiling with gcc.
I have a call to semtimedop with 4 arguments as in the definition:
Code:
int semtimedop(int, struct sembuf *, unsigned int, const struct timespec *);

When compiling I get an error saying:
error: 'semtimedop' was not declared in this scope

I looked in /usr/include/sys/sem.h to see what compilation flags are needed, and it seems to me that there is an anomally there. In the excerpt from sem.h at the bootom, I have left the ifdefs and removed the code between them (faithfully, I hope) until the definition of semtimedop. As I understand it, it is impossible to reach the correct definition of semtimedop with arguments, since on the one hand it is under a global
Code:
#ifdef _INCLUDE_XOPEN_SOURCE

but on the other hand within this global ifdef it is under the else: of:
Code:
if defined(_INCLUDE_XOPEN_SOURCE) || defined(__LP64__)

This leaves me only with the definition of semtimedop as:
Code:
     extern int semtimedop();

which does not please the compiler.

Am I wrong? What is the correct way to solve this?

Thank you,

Rimon

Edited excerpt from sem.h:
Code:
#ifdef _INCLUDE_XOPEN_SOURCE


#  ifndef _NO_USER_PROTOS


#  ifdef _PROTOTYPES

#   if defined(_INCLUDE_XOPEN_SOURCE) || defined(__LP64__)
     extern int semop(int, struct sembuf *, size_t);
#   else /* not XOPEN_SOURCE or LP64 */
     extern int semop(int, struct sembuf *, unsigned int);
#    ifdef _INCLUDE_HPUX_SOURCE
      extern int semtimedop(int, struct sembuf *, unsigned int, const struct timespec *);
#    endif /* _INCLUDE_HPUX_SOURCE */
#   endif /* not XOPEN_SOURCE or LP64 */
#  else /* not _PROTOTYPES */
     extern int semctl();
     extern int semget();
     extern int semop();
#    ifdef _INCLUDE_HPUX_SOURCE
      extern int semtimedop();
#    endif /* _INCLUDE_HPUX_SOURCE */
#  endif /* not _PROTOTYPES */

#  ifdef __cplusplus
     }
#  endif /* __cplusplus */
#  endif /* not _NO_USER_PROTOS */
#endif /* _INCLUDE_XOPEN_SOURCE */

 

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LEARN ABOUT DEBIAN

ipc

IPC(2)							     Linux Programmer's Manual							    IPC(2)

NAME

       ipc - System V IPC system calls

SYNOPSIS

       int ipc(unsigned int call, int first, int second, int third,
	       void *ptr, long fifth);

DESCRIPTION

       ipc()  is  a  common  kernel entry point for the System V IPC calls for messages, semaphores, and shared memory.  call determines which IPC
       function to invoke; the other arguments are passed through to the appropriate call.

       User programs should call the appropriate functions by their usual names.  Only standard library implementors and kernel  hackers  need	to
       know about ipc().

CONFORMING TO

       ipc() is Linux-specific, and should not be used in programs intended to be portable.

NOTES

       On some architectures--for example x86-46 and ARM--there is no ipc() system call; instead msgctl(2), semctl(2), shmctl(2), and so on really
       are implemented as separate system calls.

SEE ALSO

       msgctl(2), msgget(2), msgrcv(2), msgsnd(2), semctl(2), semget(2), semop(2), semtimedop(2), shmat(2), shmctl(2), shmdt(2), shmget(2)

COLOPHON

       This page is part of release 3.44 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2012-10-16								    IPC(2)
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