On Wed, Jun 19, 2013 at 12:58:13PM +0200, Denys Vlasenko wrote: > V2: check WSTOPSIG(status) == syscall_trap_sig, not SIGTRAP. > Add comments explaining what we think about the process status > in detach() at various steps. Simplify PTRACE_CONT > in wait loop since now syscall_trap_sig can't be seen there. > Verified that tests/detach works.
With this patch, tests/detach-running fails (detach hangs) in use_seize case, tests/detach-sleeping fails (detach hangs) in !use_seize case. > * strace.c (detach) [USE_SEIZE]: If PTRACE_SEIZE API is in use, stop > the tracee using PTRACE_INTERRUPT instead of sending it a SIGSTOP. > In a subsequent waitpid loop, wait for either SIGSTOP or syscall_trap_sig. detach() uses no USE_SEIZE ifdefs, so there should be no [USE_SEIZE]. -- ldv
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