Add -k option to print stack trace after each syscall
Print the stack trace of the traced process after each system call when
-k option is specified. It is implemented using libunwind to unwind the
stack and to obtain the function name pointed by the IP.
Based on the code that was originally taken from strace-plus
of Philip J. Guo.
* configure.ac: Add --with-libunwind option. Check libunwind support.
* Makefile.am: Add libunwind support.
* defs.h (struct tcb) [USE_LIBUNWIND]: Append libunwind specific fields.
[USE_LIBUNWIND] (stack_trace_enabled, alloc_mmap_cache,
delete_mmap_cache, print_stacktrace): New prototypes.
* mem.c (print_mmap, sys_munmap, sys_mprotect): Add libunwind support.
* process.c (sys_execve): Likewise.
* strace.c (usage, alloctcb, droptcb, init): Likewise.
* syscall.c (trace_syscall_exiting): Likewise.
* unwind.c: New file.
* strace.1: Document -k option.
diff --git a/strace.1 b/strace.1
index 4d26be5..9a7f702 100644
--- a/strace.1
+++ b/strace.1
@@ -39,7 +39,7 @@
strace \- trace system calls and signals
.SH SYNOPSIS
.B strace
-[\fB-CdffhiqrtttTvVxxy\fR]
+[\fB-CdffhikqrtttTvVxxy\fR]
[\fB-I\fIn\fR]
[\fB-b\fIexecve\fR]
[\fB-e\fIexpr\fR]...
@@ -262,6 +262,9 @@
.B \-i
Print the instruction pointer at the time of the system call.
.TP
+.B \-k
+Print the execution stack trace of the traced processes after each system call.
+.TP
.B \-q
Suppress messages about attaching, detaching etc. This happens
automatically when output is redirected to a file and the command