strace

2022-11-07 11:43:02

-c 统计每一系统调用的所执行的时间,次数和出错的次数等.

-d 输出strace关于标准错误的调试信息.

-f 跟踪由fork调用所产生的子进程.

-ff 如果提供-o filename,则所有进程的跟踪结果输出到相应的filename.pid中,pid是各进程的进程号.

-F 尝试跟踪vfork调用.在-f时,vfork不被跟踪.

-h 输出简要的帮助信息.

-i 输出系统调用的入口指针.

-q 禁止输出关于脱离的消息.

-r 打印出相对时间关于,,每一个系统调用.

-t 在输出中的每一行前加上时间信息.

-tt 在输出中的每一行前加上时间信息,微秒级.

-ttt 微秒级输出,以秒了表示时间.

-T 显示每一调用所耗的时间.

-v 输出所有的系统调用.一些调用关于环境变量,状态,输入输出等调用由于使用频繁,默认不输出.

-V 输出strace的版本信息.

-x 以十六进制形式输出非标准字符串

-xx 所有字符串以十六进制形式输出.

-a column 设置返回值的输出位置.默认 为40.

-e expr 指定一个表达式,用来控制如何跟踪.

格式：[qualifier=][!]value1[,value2]...

qualifier只能是 trace,abbrev,verbose,raw,signal,read,write其中之一.

value是用来限定的符号或数字.默认的 qualifier是 trace.感叹号是否定符号.

例如:-eopen等价于 -e trace=open,表示只跟踪open调用.

而-etrace!=open 表示跟踪除了open以外的其他调用.有两个特殊的符号 all 和 none.

注意有些shell使用!来执行历史记录里的命令,所以要使用\\.

-e trace=set 只跟踪指定的系统 调用.例如:-e trace=open,close,rean,write表示只跟踪这四个系统调用.默认的为set=all.

-e trace=file 只跟踪有关文件操作的系统调用.

-e trace=process 只跟踪有关进程控制的系统调用.

-e trace=network 跟踪与网络有关的所有系统调用.

-e strace=signal 跟踪所有与系统信号有关的 系统调用

-e trace=ipc 跟踪所有与进程通讯有关的系统调用

-e abbrev=set 设定strace输出的系统调用的结果集.

-v 等与 abbrev=none.默认为abbrev=all.

-e raw=set 将指定的系统调用的参数以十六进制显示.

-e signal=set 指定跟踪的系统信号.默认为all.如 signal=!SIGIO(或者signal=!io),表示不跟踪SIGIO信号.

-e read=set 输出从指定文件中读出 的数据.例如: -e read=,

-e write=set 输出写入到指定文件中的数据.

-o filename 将strace的输出写入文件filename -p pid 跟踪指定的进程pid.

-s strsize 指定输出的字符串的最大长度.默认为32.文件名一直全部输出.

-u username 以username的UID和GID执行被跟踪的命令

1。查看CPU运行时间 
[guest@localhost tmp]$ strace -c ./b.out         
% time     seconds usecs/call     calls    errors syscall 
------ ----------- ----------- --------- --------- ---------------- 
42.72    0.000692          87         8           open 
38.40    0.000622         622         1           set_thread_area 
16.85    0.000273         137         2           munmap 
   2.04    0.000033           5         7           read 
   0.00    0.000000           0         8           close 
   0.00    0.000000           0         1           execve 
   0.00    0.000000           0         1           access 
   0.00    0.000000           0         3           brk 
   0.00    0.000000           0         4           mprotect 
   0.00    0.000000           0        17           mmap2 
   0.00    0.000000           0         7           fstat64 
------ ----------- ----------- --------- --------- ---------------- 
100.00    0.001620                    59           total

2。查看相对运行时间

[guest@localhost tmp]$ strace -r ./b.out 
0.000560 mprotect(0xb91000, 8192, PROT_READ) = 0 
     0.000196 mprotect(0x45c000, 4096, PROT_READ) = 0 
     0.000884 mprotect(0x42a000, 16384, PROT_READ) = 0 
     0.000191 mprotect(0xa4a000, 4096, PROT_READ) = 0 
     0.000144 munmap(0xb7f12000, 45307) = 0 
     0.000577 brk(0)                    = 0x8c2b000 
     0.000171 brk(0x8c4c000)            = 0x8c4c000 
     0.000183 open("sleeper.cpp", O_RDONLY|O_LARGEFILE) = 3 
     0.000225 read(3, "#include <unistd.h>\n#include <io"..., 8191) = 355 
     0.000372 read(3, "", 8191)         = 0 
     0.000298 close(3)                  = 0 
     0.000192 exit_group(0)             = ?

3。查看文件变动相关的信号 
[guest@localhost tmp]$ strace -e trace=desc ./b.out 
open("/etc/ld.so.preload", O_RDONLY)    = 3 
fstat64(3, {st_mode=S_IFREG|0444, st_size=17, ...}) = 0 
close(3)                                = 0 
open("/lib/libcwait.so", O_RDONLY)      = 3 
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\20\3\0\0004\0\0\0"..., 512) = 512 
fstat64(3, {st_mode=S_IFREG|0755, st_size=2572, ...}) = 0 
close(3)                                = 0 
open("/etc/ld.so.cache", O_RDONLY)      = 3 
fstat64(3, {st_mode=S_IFREG|0644, st_size=45307, ...}) = 0 
close(3)                                = 0 
open("/usr/lib/libstdc++.so.6", O_RDONLY) = 3 
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0P\2348\0004\0\0\0"..., 512) = 512 
fstat64(3, {st_mode=S_IFREG|0755, st_size=936908, ...}) = 0 
close(3)                                = 0 
open("/lib/libm.so.6", O_RDONLY)        = 3

4。按调用过程来排序，并显示相对时间 
guest@localhost tmp]$ strace -r -S calls ./b.out 
     0.000000 execve("./b.out", ["./b.out"], [/* 20 vars */]) = 0 
     0.001860 brk(0)                    = 0x86b4000 
     0.000236 access("/etc/ld.so.preload", R_OK) = 0 
     0.001263 open("/etc/ld.so.preload", O_RDONLY) = 3 
     0.000497 fstat64(3, {st_mode=S_IFREG|0444, st_size=17, ...}) = 0 
     0.000211 mmap2(NULL, 17, PROT_READ|PROT_WRITE, MAP_PRIVATE, 3, 0) = 0xb7ff3000 
     0.000756 close(3)                  = 0 
     0.000173 open("/lib/libcwait.so", O_RDONLY) = 3 
     0.001096 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\20\3\0\0004\0\0\0"..., 512) = 512 
     0.000164 fstat64(3, {st_mode=S_IFREG|0755, st_size=2572, ...}) = 0 
     0.000610 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7ff2000 
     0.000165 mmap2(NULL, 5544, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x76d000 
     0.000757 mmap2(0x76e000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0x76e000 
     0.000159 close(3)                  = 0 
     0.000762 munmap(0xb7ff3000, 17)    = 0 
     0.000160 open("/etc/ld.so.cache", O_RDONLY) = 3

5。调试vsftpd，其进程号为21712，在下例中-f参数对子进程也进行了跟踪。 
[root@test1 ~]# strace -f -T -p 21712         
Process 21712 attached - interrupt to quit 
注：此时从另外一终端访问ftp 
accept(3, {sa_family=AF_INET, sin_port=htons(4138), sin_addr=inet_addr("192.168.203.137")}, [16]) = 0 <10.148879> 
rt_sigprocmask(SIG_BLOCK, [CHLD], NULL,strace = 0 <0.000050> 
rt_sigprocmask(SIG_BLOCK, [HUP], NULL,strace = 0 <0.000046> 
clone(Process 21732 attached (waiting for parent) 
Process 21732 resumed (parent 21712 ready) 
child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7fcd718) = 21732 <0.000514> 
[pid 21712] close(0)                    = 0 <0.000046> 
[pid 21712] rt_sigprocmask(SIG_UNBLOCK, [CHLD], NULL,strace = 0 <0.000049> 
[pid 21712] rt_sigprocmask(SIG_UNBLOCK, [HUP], NULL,strace = 0 <0.000039> 
[pid 21712] accept(3, <unfinished ...> 
[pid 21732] close(3)                    = 0 <0.000055> 
[pid 21732] dup2(0, 1)                  = 1 <0.000041> 
[pid 21732] dup2(0, 2)                  = 2 <0.000040> 
[pid 21732] getpeername(0, {sa_family=AF_INET, sin_port=htons(4138), sin_addr=inet_addr("192.168.203.137")}, [16]) = 0 <0.000046> 
[pid 21732] getsockname(0, {sa_family=AF_INET, sin_port=htons(21), sin_addr=inet_addr("192.168.203.139")}, [16]) = 0 <0.000042> 
[pid 21732] open("/etc/hosts.allow", O_RDONLY) = 3 <0.000065> 
[pid 21732] fstat64(3, {st_mode=S_IFREG|0644, st_size=161, ...}) = 0 <0.000043> 
[pid 21732] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fdc000 <0.000054> 
[pid 21732] read(3, "#\n# hosts.allow\tThis file descri"..., 4096) = 161 <0.000102> 
[pid 21732] read(3, "", 4096)           = 0 <0.000044> 
[pid 21732] close(3)                    = 0 <0.000044> 
[pid 21732] munmap(0xb7fdc000, 4096)    = 0 <0.000072> 
[pid 21732] open("/etc/hosts.deny", O_RDONLY) = 3 <0.000050> 
[pid 21732] fstat64(3, {st_mode=S_IFREG|0644, st_size=347, ...}) = 0 <0.000041>

6.

[root@server-mysql ~]# strace -e trace=file ls
execve("/bin/ls", ["ls"], [/* 35 vars */]) = 0
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
open("/lib64/libselinux.so.1", O_RDONLY) = 3
open("/lib64/librt.so.1", O_RDONLY) = 3
open("/lib64/libcap.so.2", O_RDONLY) = 3
open("/lib64/libacl.so.1", O_RDONLY) = 3
open("/lib64/libc.so.6", O_RDONLY) = 3
open("/lib64/libdl.so.2", O_RDONLY) = 3
open("/lib64/libpthread.so.0", O_RDONLY) = 3
open("/lib64/libattr.so.1", O_RDONLY) = 3
statfs("/selinux", {f_type=0xf97cff8c, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
open("/usr/lib/locale/locale-archive", O_RDONLY) = 3
open(".", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3

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