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令人惊奇的gdb和pstack

2024-10-27 00:24:39   210人阅读

pstack竟然是一个shell脚本，核心是调用gdb的thread apply all bt查看进程的所有线程的堆栈，之后用sed正则展示线程堆栈信息。

/proc/pid/exe是一个指向可执行文件的软连接。 

#!/bin/sh
if test $# -ne 1; then
    echo "Usage: `basename $0 .sh` <process-id>" 1>&2
    exit 1
fi
if test ! -r /proc/$1; then
    echo "Process $1 not found." 1>&2
    exit 1
fi
# GDB doesn‘t allow "thread apply all bt" when the process isn‘t
# threaded; need to peek at the process to determine if that or the
# simpler "bt" should be used.
backtrace="bt"
if test -d /proc/$1/task ; then
    # Newer kernel; has a task/ directory.
    if test `/bin/ls /proc/$1/task | /usr/bin/wc -l` -gt 1 2>/dev/null ; then
        backtrace="thread apply all bt"
    fi
elif test -f /proc/$1/maps ; then
    # Older kernel; go by it loading libpthread.
    if /bin/grep -e libpthread /proc/$1/maps > /dev/null 2>&1 ; then
        backtrace="thread apply all bt"
    fi
fi
GDB=${GDB:-/usr/bin/gdb}
if $GDB -nx --quiet --batch --readnever > /dev/null 2>&1; then
    readnever=--readnever
else
    readnever=
fi
# Run GDB, strip out unwanted noise.
$GDB --quiet $readnever -nx /proc/$1/exe $1 <<EOF 2>&1 | 
set width 0
set height 0
set pagination no
$backtrace
EOF
/bin/sed -n \
    -e ‘s/^(gdb) //‘ \
    -e ‘/^#/p‘ \
    -e ‘/^Thread/p‘

 

令人惊奇的gdb和pstack


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