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task_current_syscall

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This adds the new function task_current_syscall() on machines where the
asm/syscall.h interface is supported (CONFIG_HAVE_ARCH_TRACEHOOK).  It's
exported for modules to use in the future.  This function safely samples
the state of a blocked thread to collect what system call it is blocked
in, and the six system call argument registers.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roland McGrath
2008-07-25 19:45:59 -07:00
committed by Linus Torvalds
parent 85ba2d862e
commit bbc698636e
3 changed files with 81 additions and 0 deletions
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lib/Makefile
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@@ -78,6 +78,8 @@ lib-$(CONFIG_GENERIC_BUG) += bug.o
obj-$(CONFIG_HAVE_LMB) += lmb.o
obj-$(CONFIG_HAVE_ARCH_TRACEHOOK) += syscall.o
hostprogs-y := gen_crc32table
clean-files := crc32table.h