Dmitry V. Levin 2ee98e5030 Simplify struct inject_opts.rval semantics
Drop use of INJECT_OPTS_RVAL_DISABLE special inject_opts.rval value,
INJECT_OPTS_RVAL_DEFAULT is enough.

* defs.h (INJECT_OPTS_RVAL_DISABLE): Remove.
* qualify.c (qualify_inject_common): Do not replace
INJECT_OPTS_RVAL_DEFAULT with INJECT_OPTS_RVAL_DISABLE
in inject_opts.rval.
* syscall.c (tamper_with_syscall_entering): Check
for INJECT_OPTS_RVAL_DEFAULT instead of INJECT_OPTS_RVAL_DISABLE.
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This is strace -- a diagnostic, debugging and instructional userspace utility with a traditional command-line interface for Linux. It is used to monitor and tamper with interactions between processes and the Linux kernel, which include system calls, signal deliveries, and changes of process state. The operation of strace is made possible by the kernel feature known as ptrace.

strace is released under a Berkeley-style license at the request of Paul Kranenburg; see the file COPYING for details.

See the file NEWS for information on what has changed in recent versions.

Please send bug reports and enhancements to the strace mailing list.

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