如何在Linux

Question

我试图禁用核心转储我的应用程序禁用核心转储，我改变ulimit -c 0

但每当我试图连接到进程使用gdb --pid=<pid> GDB那么的gcore我仍然得到该应用程序的核心转储。我使用bash：

-bash-3.2$ ulimit -a 
core file size   (blocks, -c) 0 
data seg size   (kbytes, -d) unlimited 
scheduling priority    (-e) 0 
file size    (blocks, -f) unlimited 
pending signals     (-i) 65600 
max locked memory  (kbytes, -l) 50000000 
max memory size   (kbytes, -m) unlimited 
open files      (-n) 131072 
pipe size   (512 bytes, -p) 8 
POSIX message queues  (bytes, -q) 819200 
real-time priority    (-r) 0 
stack size    (kbytes, -s) 10240 
cpu time    (seconds, -t) unlimited 
max user processes    (-u) 131072 
virtual memory   (kbytes, -v) unlimited 
file locks      (-x) unlimited 
-bash-3.2$ ps -ef | grep top 
oracle 8951 8879 0 Mar05 ?  00:01:44 /u01/R122_EBS/fs1/FMW_Home/jrockit32 jre/bin/java -classpath /u01/R122_EBS/fs1/FMW_Home/webtier/opmn/lib/wlfullclient.jar:/u01/R122_EBS/fs1/FMW_Home/Oracle_EBS-app1/shared-libs/ebs-appsborg/WEB-INF/lib/ebsAppsborgManifest.jar:/u01/R122_EBS/fs1/EBSapps/comn/java/classes -mx256m oracle.apps.ad.tools.configuration.RegisterWLSListeners -appsuser APPS -appshost rws3510293 -appsjdbcconnectdesc jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=(LOAD_BALANCE=YES)(FAILOVER=YES)(ADDRESS=(PROTOCOL=tcp)(HOST=rws3510293.us.oracle.com)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=rahulshr))) -adtop /u01/R122_EBS/fs1/EBSapps/appl/ad/12.0.0 -wlshost rws3510293 -wlsuser weblogic -wlsport 7001 -dbsid rahulshr -dbhost rws3510293 -dbdomain us.oracle.com -dbport 1521 -outdir /u01/R122_EBS/fs1/inst/apps/rahulshr_rws3510293/appltmp/Tue_Mar_5_00_42_52_2013 -log /u01/R122_EBS/fs1/inst/apps/rahulshr_rws3510293/logs/appl/rgf/Tue_Mar_5_00_42_52_2013/adRegisterWLSListeners.log -promptmsg hide -contextfile /u01/R122_EBS/fs1/inst/apps/rahulshr_rws3510293/appl/admin/rahulshr_rws3510293.xml 
oracle 23694 22895 0 Mar05 pts/0 00:00:00 top 
oracle 26235 22895 0 01:51 pts/0 00:00:00 grep top 
-bash-3.2$ gcore 
usage: gcore [-o filename] pid 
-bash-3.2$ gcore 23694 
0x000000355cacbfe8 in tcsetattr() from /lib64/libc.so.6 
Saved corefile core.23694 

[2]+ Stopped     top 
-bash-3.2$ ls -l 
total 2384 
-rw-r--r-- 1 oracle dba 2425288 Mar 6 01:52 core.23694 
drwxr----- 3 oracle dba 4096 Mar 5 03:32 oradiag_oracle 
-rwxr-xr-x 1 oracle dba  20 Mar 5 04:06 test.sh 
-bash-3.2$ 

Answer 1

的gcore命令gdb没有使用Linux的核心文件中的内核代码倾倒。它正在走内存本身，并以与进程核心文件相同的格式写出二进制文件。这是显而易见的，因为在发布gcore之后该进程仍然是活动的，而如果Linux正在转储核心文件，则该进程将被终止。