update_ulimit.sh

#!/bin/bash

if [ $# -lt 3 ];then
    echo "usage: $pid $key $value"
    exit 1
fi

pid=$1
key=$2
value="${3}ll"

#       修改nproc
#       Limit                     Soft Limit           Hard Limit           Units     
#key=0  Max cpu time              unlimited            unlimited            seconds   
#key=1  Max file size             unlimited            unlimited            bytes     
#key=2  Max data size             unlimited            unlimited            bytes     
#key=3  Max stack size            10485760             unlimited            bytes     
#key=4  Max core file size        unlimited            unlimited            bytes     
#key=5  Max resident set          unlimited            unlimited            bytes     
#key=6  Max processes             1024                 unlimited            processes 
#key=7  Max open files            65536                65536                files     
#key=8  Max locked memory         65536                65536                bytes     
#key=9  Max address space         unlimited            unlimited            bytes     
#key=10 Max file locks            unlimited            unlimited            locks     
#key=11 Max pending signals       256265               256265               signals   
#key=12 Max msgqueue size         819200               819200               bytes     
#key=13 Max nice priority         0                    0                    
#key=14 Max realtime priority     0                    0                    
#key=15 Max realtime timeout      unlimited            unlimited            us  

# setrlimit第一个参数为 `cat /proc/pid/limits` 后得到的列表中的偏移(从0开始)
gdb -p $pid << EOF >> ulimit.log 2>&1
    set \$rlim = &{$value, $value} 
    p setrlimit($key, \$rlim)
    detach
    quit
EOF