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.\" ========================================================================
.\"
.IX Title "GSTACK 1"
.TH GSTACK 1 "2026-06-29" "gdb-16.3.90.20250906-git" "GNU Development Tools"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
gstack \- Print a stack trace of a running program
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
gstack [\-h | \-\-help] [\-v | \-\-version] \fIpid\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Print a stack trace of a running program with process \s-1ID\s0 \fIpid\fR.  If the process
is multi-threaded, \fBgstack\fR outputs backtraces for every thread which exists
in the process.
.PP
The script invokes \s-1GDB,\s0 attaches to the given process \s-1ID,\s0 prints the stack trace,
and detaches from the process.
.PP
\&\fBgstack\fR exits with non-zero status if \f(CW\*(C`gdb\*(C'\fR was unable to attach to
the given process \s-1ID\s0 for any reason, such as a non-existent process \s-1ID\s0 or
insufficient privileges to attach to the process.
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-\-help\fR" 4
.IX Item "--help"
.PD 0
.IP "\fB\-h\fR" 4
.IX Item "-h"
.PD
List all options, with brief explanations.
.IP "\fB\-\-version\fR" 4
.IX Item "--version"
.PD 0
.IP "\fB\-v\fR" 4
.IX Item "-v"
.PD
Print version information and then exit.
.SH "ENVIRONMENT"
.IX Header "ENVIRONMENT"
.IP "\fB\s-1AWK\s0\fR" 4
.IX Item "AWK"
Full file name for an Awk interpreter to use.  If not set, \fB\s-1PATH\s0\fR will be
searched for an \f(CW\*(C`awk\*(C'\fR program.
.IP "\fB\s-1GDB\s0\fR" 4
.IX Item "GDB"
Full file name for a \s-1GDB\s0 executable to use to generate stack backtraces.
If not set, \fB\s-1PATH\s0\fR will be searched for a \f(CW\*(C`gdb\*(C'\fR program.
.IP "\fB\s-1GDBARGS\s0\fR" 4
.IX Item "GDBARGS"
Optional arguments to be passed to the \f(CW\*(C`gdb\*(C'\fR program.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
The full documentation for \s-1GDB\s0 is maintained as a Texinfo manual.
If the \f(CW\*(C`info\*(C'\fR and \f(CW\*(C`gdb\*(C'\fR programs and \s-1GDB\s0's Texinfo
documentation are properly installed at your site, the command
.PP
.Vb 1
\&        info gdb
.Ve
.PP
should give you access to the complete manual.
.PP
\&\fIUsing \s-1GDB: A\s0 Guide to the \s-1GNU\s0 Source-Level Debugger\fR,
Richard M. Stallman and Roland H. Pesch, July 1991.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c) 1988\-2024 Free Software Foundation, Inc.
.PP
Permission is granted to copy, distribute and/or modify this document
under the terms of the \s-1GNU\s0 Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being \*(L"Free Software\*(R" and \*(L"Free Software Needs
Free Documentation\*(R", with the Front-Cover Texts being \*(L"A \s-1GNU\s0 Manual,\*(R"
and with the Back-Cover Texts as in (a) below.
.PP
(a) The \s-1FSF\s0's Back-Cover Text is: \*(L"You are free to copy and modify
this \s-1GNU\s0 Manual.  Buying copies from \s-1GNU\s0 Press supports the \s-1FSF\s0 in
developing \s-1GNU\s0 and promoting software freedom.\*(R"
