[LINUX] strace 명령어/디버깅하기

strace
- 특정 프로그램의 system call과 signal을 감시 및 추적 하는 동적 분석 도구 
- 소스코드가 없는 경우 또는 특정 프로그램의 시작부터 종료까지의 시퀀스를 살펴볼 필요가 있을때 해법이 될 수 있다. 





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모든 시스템콜 확인 

[root@tak ~]# strace ls 
execve("/bin/ls", ["ls"], [/* 25 vars */]) = 0 
brk(NULL)                               = 0x13aa000 
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f427924c000 
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory) 
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 
fstat(3, {st_mode=S_IFREG|0644, st_size=119569, ...}) = 0 
mmap(NULL, 119569, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f427922e000 
close(3)                                = 0 
open("/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3 
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320i\0\0\0\0\0\0"..., 832) = 832 
fstat(3, {st_mode=S_IFREG|0755, st_size=155784, ...}) = 0 
mmap(NULL, 2255184, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4278e05000 
mprotect(0x7f4278e29000, 2093056, PROT_NONE) = 0 
mmap(0x7f4279028000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x23000) = 0x7f4279028000 
mmap(0x7f427902a000, 6480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f427902a000 
close(3)                                = 0 
open("/lib64/libcap.so.2", O_RDONLY|O_CLOEXEC) = 3 
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\26\0\0\0\0\0\0"..., 832) = 832 
fstat(3, {st_mode=S_IFREG|0755, st_size=20048, ...}) = 0 
mmap(NULL, 2114112, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4278c00000 
mprotect(0x7f4278c04000, 2093056, PROT_NONE) = 0 
mmap(0x7f4278e03000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f4278e03000 
close(3)                                = 0 
open("/lib64/libacl.so.1", O_RDONLY|O_CLOEXEC) = 3 
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200\37\0\0\0\0\0\0"..., 832) = 832 
fstat(3, {st_mode=S_IFREG|0755, st_size=37056, ...}) = 0 
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f427922d000 
mmap(NULL, 2130560, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f42789f7000 
mprotect(0x7f42789fe000, 2097152, PROT_NONE) = 0 
mmap(0x7f4278bfe000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7f4278bfe000 
close(3)                                = 0 
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20&\2\0\0\0\0\0"..., 832) = 832 
fstat(3, {st_mode=S_IFREG|0755, st_size=2156160, ...}) = 0 
mmap(NULL, 3985888, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4278629000 
mprotect(0x7f42787ec000, 2097152, PROT_NONE) = 0 
mmap(0x7f42789ec000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c3000) = 0x7f42789ec000 
mmap(0x7f42789f2000, 16864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f42789f2000 
close(3)                                = 0 
open("/lib64/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3 
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\25\0\0\0\0\0\0"..., 832) = 832 
fstat(3, {st_mode=S_IFREG|0755, st_size=402384, ...}) = 0 
mmap(NULL, 2494984, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f42783c7000 
mprotect(0x7f4278427000, 2097152, PROT_NONE) = 0 
mmap(0x7f4278627000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x60000) = 0x7f4278627000 
close(3)                                = 0 
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3 
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\r\0\0\0\0\0\0"..., 832) = 832 
fstat(3, {st_mode=S_IFREG|0755, st_size=19288, ...}) = 0 
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f427922c000 
mmap(NULL, 2109712, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f42781c3000 
mprotect(0x7f42781c5000, 2097152, PROT_NONE) = 0 
mmap(0x7f42783c5000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f42783c5000 
close(3)                                = 0 
open("/lib64/libattr.so.1", O_RDONLY|O_CLOEXEC) = 3 
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\23\0\0\0\0\0\0"..., 832) = 832 
fstat(3, {st_mode=S_IFREG|0755, st_size=19896, ...}) = 0 
mmap(NULL, 2113904, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4277fbe000 
mprotect(0x7f4277fc2000, 2093056, PROT_NONE) = 0 
mmap(0x7f42781c1000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f42781c1000 
close(3)                                = 0 
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3 
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@m\0\0\0\0\0\0"..., 832) = 832 
fstat(3, {st_mode=S_IFREG|0755, st_size=142232, ...}) = 0 
mmap(NULL, 2208904, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4277da2000 
mprotect(0x7f4277db9000, 2093056, PROT_NONE) = 0 
mmap(0x7f4277fb8000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x7f4277fb8000 
mmap(0x7f4277fba000, 13448, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f4277fba000 
close(3)                                = 0 
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f427922b000 
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4279229000 
arch_prctl(ARCH_SET_FS, 0x7f4279229840) = 0 
mprotect(0x7f42789ec000, 16384, PROT_READ) = 0 
mprotect(0x7f4277fb8000, 4096, PROT_READ) = 0 
mprotect(0x7f42781c1000, 4096, PROT_READ) = 0 
mprotect(0x7f42783c5000, 4096, PROT_READ) = 0 
mprotect(0x7f4278627000, 4096, PROT_READ) = 0 
mprotect(0x7f4278bfe000, 4096, PROT_READ) = 0 
mprotect(0x7f4278e03000, 4096, PROT_READ) = 0 
mprotect(0x7f4279028000, 4096, PROT_READ) = 0 
mprotect(0x61a000, 4096, PROT_READ)     = 0 
mprotect(0x7f427924d000, 4096, PROT_READ) = 0 
munmap(0x7f427922e000, 119569)          = 0 
set_tid_address(0x7f4279229b10)         = 10215 
set_robust_list(0x7f4279229b20, 24)     = 0 
rt_sigaction(SIGRTMIN, {0x7f4277da8820, [], SA_RESTORER|SA_SIGINFO, 0x7f4277db15f0}, NULL, 8) = 0 
rt_sigaction(SIGRT_1, {0x7f4277da88b0, [], SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x7f4277db15f0}, NULL, 8) = 0 
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 
statfs("/sys/fs/selinux", {f_type=SELINUX_MAGIC, 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, f_flags=ST_VALID|ST_RELATIME}) = 0 
statfs("/sys/fs/selinux", {f_type=SELINUX_MAGIC, 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, f_flags=ST_VALID|ST_RELATIME}) = 0 
stat("/sys/fs/selinux", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 
brk(NULL)                               = 0x13aa000 
brk(0x13cb000)                          = 0x13cb000 
access("/etc/selinux/config", F_OK)     = 0 
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3 
fstat(3, {st_mode=S_IFREG|0644, st_size=106075056, ...}) = 0 
mmap(NULL, 106075056, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f4271878000 
close(3)                                = 0 
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0 
ioctl(1, TIOCGWINSZ, {ws_row=61, ws_col=256, ws_xpixel=0, ws_ypixel=0}) = 0 
openat(AT_FDCWD, ".", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3 
getdents(3, /* 14 entries */, 32768)    = 464 
getdents(3, /* 0 entries */, 32768)     = 0 
close(3)                                = 0 
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0 
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f427924b000 
write(1, "anaconda-ks.cfg  initial-setup-k"..., 38anaconda-ks.cfg  initial-setup-ks.cfg 
) = 38 
close(1)                                = 0 
munmap(0x7f427924b000, 4096)            = 0 
close(2)                                = 0 
exit_group(0)                           = ? 
+++ exited with 0 +++ 
 
############################################################################################################################################################ 
특정 시스템콜만 확인하고 싶을때  
 
[root@tak ~]# strace -e open ls 
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 
open("/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3 
open("/lib64/libcap.so.2", O_RDONLY|O_CLOEXEC) = 3 
open("/lib64/libacl.so.1", O_RDONLY|O_CLOEXEC) = 3 
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 
open("/lib64/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3 
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3 
open("/lib64/libattr.so.1", O_RDONLY|O_CLOEXEC) = 3 
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3 
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3 
anaconda-ks.cfg  initial-setup-ks.cfg 
+++ exited with 0 +++ 

여러개 옵션 줄때 

[root@tak ~]# strace -e trace=open,read ls 
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320i\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libcap.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\26\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libacl.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200\37\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20&\2\0\0\0\0\0"..., 832) = 832
open("/lib64/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\25\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\r\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libattr.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\23\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@m\0\0\0\0\0\0"..., 832) = 832
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
anaconda-ks.cfg  initial-setup-ks.cfg
+++ exited with 0 +++

############################################################################################################################################################
출력 결과를 파일로 저장할때  -o 옵션 
[root@tak ~]# strace -o output.txt -e trace=open,read ls
anaconda-ks.cfg  initial-setup-ks.cfg  output.txt
[root@tak ~]# cat output.txt 
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320i\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libcap.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\26\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libacl.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200\37\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20&\2\0\0\0\0\0"..., 832) = 832
open("/lib64/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\25\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\r\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libattr.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\23\0\0\0\0\0\0"..., 832) = 832
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@m\0\0\0\0\0\0"..., 832) = 832
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
+++ exited with 0 +++

############################################################################################################################################################

pid 정보확인

tmax2@tak:/home/tmax2/proframe5.0/package/tmax> ps -C startNodeManager
   PID TTY          TIME CMD
  9483 pts/1    00:00:00 startNodeManage


############################################################################################################################################################

프로세스 분석 -p 옵션 

tmax2@tak:/home/tmax2/proframe5.0/package/tmax> strace -p 9483 -o output.txt
strace: Process 9483 attached


tmax2@tak:/home/tmax2/proframe5.0/package/tmax> tail -f output.txt 
wait4(-1, 
[{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 9486
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=9486, si_uid=1001, si_status=0, si_utime=316, si_stime=472} ---
wait4(-1, 0x7ffe83c98c10, WNOHANG, NULL) = -1 ECHILD (No child processes)
rt_sigreturn({mask=[]})                 = 0
rt_sigaction(SIGINT, {SIG_IGN, [], SA_RESTORER, 0x7f3f5b6413b0}, {SIG_IGN, [], SA_RESTORER, 0x7f3f5b6413b0}, 8) = 0
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
read(255, "", 2242)                     = 0
exit_group(0)                           = ?
+++ exited with 0 +++

############################################################################################################################################################

시간대로 분석하기   -t 옵션
[root@tak ~]# strace -t -e open ls /home/root
18:06:45 open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/lib64/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/lib64/libcap.so.2", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/lib64/libacl.so.1", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/lib64/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/lib64/libattr.so.1", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
18:06:45 open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
18:06:45 open("/usr/share/locale/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
18:06:45 open("/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
18:06:45 open("/usr/share/locale/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
18:06:45 open("/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
18:06:45 open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
ls: cannot access /home/root18:06:45 open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
18:06:45 open("/usr/share/locale/en_US.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
18:06:45 open("/usr/share/locale/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
18:06:45 open("/usr/share/locale/en.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
18:06:45 open("/usr/share/locale/en.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
18:06:45 open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
: No such file or directory
18:06:45 +++ exited with 2 +++
############################################################################################################################################################
시스템콜 횟수 통계내기  -c 옵션 

[root@tak ~]# strace -c ls 
anaconda-ks.cfg  initial-setup-ks.cfg  output.txt
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
  0.00    0.000000           0         8           read
  0.00    0.000000           0         1           write
  0.00    0.000000           0        10           open
  0.00    0.000000           0        13           close
  0.00    0.000000           0         1           stat
  0.00    0.000000           0        11           fstat
  0.00    0.000000           0        27           mmap
  0.00    0.000000           0        18           mprotect
  0.00    0.000000           0         2           munmap
  0.00    0.000000           0         3           brk
  0.00    0.000000           0         2           rt_sigaction
  0.00    0.000000           0         1           rt_sigprocmask
  0.00    0.000000           0         2           ioctl
  0.00    0.000000           0         2         1 access
  0.00    0.000000           0         1           execve
  0.00    0.000000           0         2           getdents
  0.00    0.000000           0         1           getrlimit
  0.00    0.000000           0         2           statfs
  0.00    0.000000           0         1           arch_prctl
  0.00    0.000000           0         1           set_tid_address
  0.00    0.000000           0         1           openat
  0.00    0.000000           0         1           set_robust_list
------ ----------- ----------- --------- --------- ----------------
100.00    0.000000                   111         1 total