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Re: System V IPC on LX
David Andersson wrote:
> When trying to make for target, I get:
> [david@burk14 hello]$ make
> gcc_cris -mlinux -DCRISMMU
> -muclibc=/home/david/LX/axis/devboard_lx/eroot -s -static hello.o -o
> hello.o: In function `main':
> hello.o(.text+0x46): undefined reference to `semget'
> hello.o(.text+0x6e): undefined reference to `semctl'
> hello.o(.text+0xb0): undefined reference to `semop'
> hello.o(.text+0x148): undefined reference to `semop'
> collect2: ld returned 1 exit status
> make: *** [hello] Error 1
> What am I doing wrong?
You're not doing anything wrong. The SYSV IPC semaphore functions were
added recently to Lineo's uC-libc, but are currently missing in the
uC-libc that comes with the developer board. Good news is they are easy
enough to add. The semaphore functions are multiplexed via the ipc
system call, like this:
semget (key, nsems, semflg)
return __ipc(IPCOP_semget, key, nsems, semflg, NULL);
I'll add it to our uC-libc, and get back to you with a patch to uC-libc
once I have tested it.
Orjan Friberg E-mail: firstname.lastname@example.org
Axis Communications AB Phone: +46 46 272 17 68