"#define _POSIX_THREAD_PROCESS_SHARED -1" in the libc in the
ts7260-linux2.6-etch.dd.bz2 image, plus getting ENOSYS back from
sem_open(blah,blah,blah,1) seems pretty conclusive. Yet I also get back ENOSYS
from sem_open(blah,blah,blah,0) which doesn't seem right since
_POSIX_SEMAPHORES is defined to be 200112L.
There's a bunch of online posts about /dev/shm being not truly tmpfs, but
rather ramfs ala CONFIG_TINY_SHMEM, and how config options can cause the
ENOSYS. Tried many mounting options, no joy. Anyone else using named POSIX
mutexes across processes in 2.6.21-ts, or have a clue? Thanks!
The config file I am using sets:
# General setup
#
CONFIG_LOCALVERSION=""
# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_IPC_NS=y
CONFIG_SYSVIPC_SYSCTL=y
CONFIG_POSIX_MQUEUE=y
# CONFIG_BSD_PROCESS_ACCT is not set
# CONFIG_TASKSTATS is not set
# CONFIG_UTS_NS is not set
# CONFIG_AUDIT is not set
CONFIG_IKCONFIG=m
CONFIG_IKCONFIG_PROC=y
# CONFIG_SYSFS_DEPRECATED is not set
# CONFIG_RELAY is not set
CONFIG_BLK_DEV_INITRD=y
CONFIG_INITRAMFS_SOURCE=""
# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
CONFIG_SYSCTL=y
CONFIG_EMBEDDED=y
CONFIG_UID16=y
CONFIG_SYSCTL_SYSCALL=y
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_EXTRA_PASS=y
CONFIG_HOTPLUG=y
CONFIG_PRINTK=y
# CONFIG_BUG is not set
# CONFIG_ELF_CORE is not set
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_SHMEM=y
CONFIG_SLAB=y
# CONFIG_VM_EVENT_COUNTERS is not set
CONFIG_RT_MUTEXES=y
# CONFIG_TINY_SHMEM is not set
CONFIG_BASE_SMALL=0
# CONFIG_SLOB is not set
and
#
# Pseudo filesystems
#
CONFIG_PROC_FS=y
CONFIG_PROC_SYSCTL=y
CONFIG_SYSFS=y
CONFIG_TMPFS=y
CONFIG_TMPFS_POSIX_ACL=y
# CONFIG_HUGETLB_PAGE is not set
CONFIG_RAMFS=y
# CONFIG_CONFIGFS_FS is not set
------------------------------------
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