最終更新:2022-09-13 (火) 12:50:56 (585d)
strace
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straceはシステムコールトレーサで、すでに実行されているプログラムによって発せられたコールを追跡する（straceを既存のPIDにバインドする）ことも、テストしたいプロセスをstraceに開始させることもできる。
インストール
yum install strace
引数
- -T: システムコールの所要時間（秒.マイクロ秒）を出力 ※マイクロ秒=1/1,000,000秒
- -tt: タイムスタンプをマイクロ秒で出力
- -o: トレースを指定したファイルに出力
- -c: 回数をカウント
- -e expr: A qualifying expression which modifies which events to trace or how to trace them.
- -e trace=set: Trace only the specified set of system calls.
trace=open,close,read,write
- -e trace=file: Trace all system calls which take a file name as an argument.
- -e trace=process: Trace all system calls which involve process management. This is useful for watching the fork, wait, and exec steps of a process.
- -e trace=network: Trace all the network related system calls.
- -e trace=signal: Trace all signal related system calls.
- -e trace=ipc: Trace all IPC related system calls.
- -e trace=desc: Trace all file descriptor related system calls.
- -e trace=memory: Trace all memory mapping related system calls.
メモ
- 標準で標準エラー?に出力するので下記のような感じにすると良い
strace gcc 2>&1 | grep -i spec
例
/* hello_world.c */ #include <stdio.h> int main(void) { printf("Hello world!\n"); return 0; }
# strace ./hello execve("./hello", ["./hello"], [/* 46 vars */]) = 0 brk(0) = 0x8f3000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ffd146ec000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=53125, ...}) = 0 mmap(NULL, 53125, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ffd146df000 close(3) = 0 open("/lib64/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\355\301Z:\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1922112, ...}) = 0 mmap(0x3a5ac00000, 3745960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x3a5ac00000 mprotect(0x3a5ad89000, 2097152, PROT_NONE) = 0 mmap(0x3a5af89000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x189000) = 0x3a5af89000 mmap(0x3a5af8e000, 18600, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3a5af8e000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ffd146de000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ffd146dd000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ffd146dc000 arch_prctl(ARCH_SET_FS, 0x7ffd146dd700) = 0 mprotect(0x3a5af89000, 16384, PROT_READ) = 0 mprotect(0x3a5aa1f000, 4096, PROT_READ) = 0 munmap(0x7ffd146df000, 53125) = 0 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 8), ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ffd146eb000 write(1, "Hello world!\n", 13Hello world! ) = 13 exit_group(0) = ?
