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脚本写入shell文件pstack，直接执行这个脚本
pstack pid
#!/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’
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