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| <html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>strace</title><link rel="stylesheet" type="text/css" href="docbook.css"><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="cygwin-ug-net.html" title="Cygwin User's Guide"><link rel="up" href="using-utils.html" title="Cygwin Utilities"><link rel="prev" href="ssp.html" title="ssp"><link rel="next" href="tzset.html" title="tzset"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">strace</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ssp.html">Prev</a> </td><th width="60%" align="center">Cygwin Utilities</th><td width="20%" align="right"> <a accesskey="n" href="tzset.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="strace"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>strace — Trace system calls and signals</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">strace</code> [-defnqtuw] [-b <em class="replaceable"><code>SIZE</code></em>] [-m <em class="replaceable"><code>MASK</code></em>] [-o <em class="replaceable"><code>FILENAME</code></em>] [-f <em class="replaceable"><code>PERIOD</code></em>] { <em class="replaceable"><code>command-line</code></em>... | |
| [-T] |
| -p <em class="replaceable"><code>pid</code></em> |
| }</p></div><div class="cmdsynopsis"><p><code class="command">strace</code> -h | -V </p></div></div><div class="refsect1"><a name="strace-options"></a><h2>Options</h2><pre class="screen"> |
| -b, --buffer-size=SIZE set size of output file buffer |
| -d, --no-delta don't 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 '+' or ',' 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't 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 |
| </pre></div><div class="refsect1"><a name="strace-desc"></a><h2>Description</h2><p>The <span class="command"><strong>strace</strong></span> 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 |
| <code class="literal">-o</code> option. With the <code class="literal">-w</code> option, you |
| can start an strace session in a new window, for example: |
| </p><pre class="screen"> |
| $ strace -o tracing_output -w sh -c 'while true; do echo "tracing..."; done' & |
| </pre><p> |
| This is particularly useful for <span class="command"><strong>strace</strong></span> sessions that |
| take a long time to complete. </p><p> Note that <span class="command"><strong>strace</strong></span> is a standalone Windows program |
| and so does not rely on the Cygwin DLL itself (you can verify this with |
| <span class="command"><strong>cygcheck</strong></span>). As a result it does not understand |
| symlinks. This program is mainly useful for debugging the Cygwin DLL |
| itself.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ssp.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="using-utils.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="tzset.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ssp </td><td width="20%" align="center"><a accesskey="h" href="cygwin-ug-net.html">Home</a></td><td width="40%" align="right" valign="top"> tzset</td></tr></table></div></body></html> |
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