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.\" Title: strace
.\" Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 02/15/2023
.\" Manual: Cygwin Utilities
.\" Source: Cygwin Utilities
.\" Language: English
.\"
.TH "STRACE" "1" "02/15/2023" "Cygwin Utilities" "Cygwin Utilities"
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.SH "NAME"
strace \- Trace system calls and signals
.SH "SYNOPSIS"
.HP \w'\fBstrace\fR\ 'u
\fBstrace\fR [\-defnqtuw] [\-b\ \fISIZE\fR] [\-m\ \fIMASK\fR] [\-o\ \fIFILENAME\fR] [\-f\ \fIPERIOD\fR] {\fIcommand\-line\fR... | [\-T]\ \-p\ \fIpid\fR }
.HP \w'\fBstrace\fR\ 'u
\fBstrace\fR \-h | \-V
.SH "OPTIONS"
.sp
.if n \{\
.RS 4
.\}
.nf
\-b, \-\-buffer\-size=SIZE set size of output file buffer
\-d, \-\-no\-delta don\*(Aqt display the delta\-t microsecond timestamp
\-e, \-\-events log all Windows DEBUG_EVENTS (toggle \- default true)
\-f, \-\-trace\-children trace child processes (toggle \- default true)
\-h, \-\-help output usage information and exit
\-m, \-\-mask=MASK set message filter mask
\-n, \-\-crack\-error\-numbers output descriptive text instead of error
numbers for Windows errors
\-o, \-\-output=FILENAME set output file to FILENAME
\-p, \-\-pid=n attach to executing program with cygwin pid n
\-q, \-\-quiet toggle "quiet" flag\&. Defaults to on if "\-p",
off otherwise\&.
\-S, \-\-flush\-period=PERIOD flush buffered strace output every PERIOD secs
\-t, \-\-timestamp use an absolute hh:mm:ss timestamp insted of
the default microsecond timestamp\&. Implies \-d
\-T, \-\-toggle toggle tracing in a process already being
traced\&. Requires \-p <pid>
\-u, \-\-usecs toggle printing of microseconds timestamp
\-V, \-\-version output version information and exit
\-w, \-\-new\-window spawn program under test in a new window
MASK can be any combination of the following mnemonics and/or hex values
(0x is optional)\&. Combine masks with \*(Aq+\*(Aq or \*(Aq,\*(Aq like so:
\-\-mask=wm+system,malloc+0x00800
Mnemonic Hex Corresponding Def Description
=========================================================================
all 0x000001 (_STRACE_ALL) All strace messages\&.
flush 0x000002 (_STRACE_FLUSH) Flush output buffer after each message\&.
inherit 0x000004 (_STRACE_INHERIT) Children inherit mask from parent\&.
uhoh 0x000008 (_STRACE_UHOH) Unusual or weird phenomenon\&.
syscall 0x000010 (_STRACE_SYSCALL) System calls\&.
startup 0x000020 (_STRACE_STARTUP) argc/envp printout at startup\&.
debug 0x000040 (_STRACE_DEBUG) Info to help debugging\&.
paranoid 0x000080 (_STRACE_PARANOID) Paranoid info\&.
termios 0x000100 (_STRACE_TERMIOS) Info for debugging termios stuff\&.
select 0x000200 (_STRACE_SELECT) Info on ugly select internals\&.
wm 0x000400 (_STRACE_WM) Trace Windows msgs (enable _strace_wm)\&.
sigp 0x000800 (_STRACE_SIGP) Trace signal and process handling\&.
minimal 0x001000 (_STRACE_MINIMAL) Very minimal strace output\&.
pthread 0x002000 (_STRACE_PTHREAD) Pthread calls\&.
exitdump 0x004000 (_STRACE_EXITDUMP) Dump strace cache on exit\&.
system 0x008000 (_STRACE_SYSTEM) Serious error; goes to console and log\&.
nomutex 0x010000 (_STRACE_NOMUTEX) Don\*(Aqt use mutex for synchronization\&.
malloc 0x020000 (_STRACE_MALLOC) Trace malloc calls\&.
thread 0x040000 (_STRACE_THREAD) Thread\-locking calls\&.
special 0x100000 (_STRACE_SPECIAL) Special debugging printfs for
non\-checked\-in code
.fi
.if n \{\
.RE
.\}
.SH "DESCRIPTION"
.PP
The
\fBstrace\fR
program executes a program, and optionally the children of the program, reporting any Cygwin DLL output from the program(s) to stdout, or to a file with the
\-o
option\&. With the
\-w
option, you can start an strace session in a new window, for example:
.sp
.if n \{\
.RS 4
.\}
.nf
$ strace \-o tracing_output \-w sh \-c \*(Aqwhile true; do echo "tracing\&.\&.\&."; done\*(Aq &
.fi
.if n \{\
.RE
.\}
.sp
This is particularly useful for
\fBstrace\fR
sessions that take a long time to complete\&.
.PP
Note that
\fBstrace\fR
is a standalone Windows program and so does not rely on the Cygwin DLL itself (you can verify this with
\fBcygcheck\fR)\&. As a result it does not understand symlinks\&. This program is mainly useful for debugging the Cygwin DLL itself\&.
.SH "COPYRIGHT"
.br
.PP
Copyright \(co Cygwin authors
.PP
Permission is granted to make and distribute verbatim copies of this documentation provided the copyright notice and this permission notice are preserved on all copies.
.PP
Permission is granted to copy and distribute modified versions of this documentation under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one.
.PP
Permission is granted to copy and distribute translations of this documentation into another language, under the above conditions for modified versions, except that this permission notice may be stated in a translation approved by the Free Software Foundation.
.sp