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strace used to suspend waitpid until there is a child for waitpid'ing process to collect status from. Apparently, it was done because in some very old kernels (circa 2002 or even earlier) there were ptrace bugs which were making waitpid in real parent to not see children. This kernel bug is fixed long ago. This change removes the workaround. test/wait_must_be_interruptible.c is a test program which illustrates why without this change strace changes programs's behavior. * defs.h: Delete waitpid and nclone_waiting members from from struct tcb. Remove declaration of internal_wait(). * process.c (internal_wait): Remove this function. * strace.c (alloc_tcb): Do not set tcp->nclone_waiting. (resume): Remove this function. (resume_from_tcp): Remove this function. (detach): Do not call resume_from_tcp(). (handle_group_exit): Do not call resume_from_tcp(). * syscall.c (internal_syscall): Do not call internal_wait(). Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This is strace 4.0, a system call tracer for SunOS 4.x, Linux, System V release 4, Solaris 2.x and Irix 5.x. strace is released under a Berkeley-style license at the request of Paul Kranenburg; see the file COPYRIGHT for details. Read the INSTALL file for generic instructions on how to install strace. If configure cannot guess your system configuration, you can specify it on the command line after the other options like this: ./configure --prefix=/usr i486-linux A single sunos4.1 binary should work on all the sun4, sun4c and sun4m kernel architectures. Let me know if sun4d doesn't work. Other i486-*-sysv4 systems may work with little or no tweaking. See the file NEWS for information on what has changed in recent versions. See the file PORTING if you like strace but it doesn't work on an operating system you use frequently. See the file CREDITS to see who has contributed to strace. See the file TODO if you feel like helping out. You can get the latest version of strace from its homepage at http://sourceforge.net/projects/strace/ . Please send bug reports and enhancements to the strace mailinglist at strace-devel@lists.sourceforge.net, or directly to Wichert Akkerman <wakkerma@debian.org>