strace

システムコールの追跡をするためのコマンド

code:memo.c

// main.c

int main() {

return 0;

}

code:memo

$ gcc main.c

$ strace ./a.out

brk(NULL) = 0x562823ea2000

arch_prctl(0x3001 /* ARCH_??? */, 0x7ffed9c48c70) = -1 EINVAL (Invalid argument)

mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa7eb2f6000

access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)

openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3

newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=34979, ...}, AT_EMPTY_PATH) = 0

mmap(NULL, 34979, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fa7eb2ed000

close(3) = 0

openat(AT_FDCWD, "/lib/x86_64-linux-gnu/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\0P\237\2\0\0\0\0\0"..., 832) = 832

pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784

pread64(3, "\4\0\0\0 \0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0"..., 48, 848) = 48

pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0i8\235HZ\227\223\333\350s\360\352,\223\340."..., 68, 896) = 68

newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=2216304, ...}, AT_EMPTY_PATH) = 0

pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784

mmap(NULL, 2260560, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fa7eb0c5000

mmap(0x7fa7eb0ed000, 1658880, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x28000) = 0x7fa7eb0ed000

mmap(0x7fa7eb282000, 360448, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1bd000) = 0x7fa7eb282000

mmap(0x7fa7eb2da000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x214000) = 0x7fa7eb2da000

mmap(0x7fa7eb2e0000, 52816, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fa7eb2e0000

close(3) = 0

mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa7eb0c2000

arch_prctl(ARCH_SET_FS, 0x7fa7eb0c2740) = 0

set_tid_address(0x7fa7eb0c2a10) = 273

set_robust_list(0x7fa7eb0c2a20, 24) = 0

rseq(0x7fa7eb0c30e0, 0x20, 0, 0x53053053) = 0

mprotect(0x7fa7eb2da000, 16384, PROT_READ) = 0

mprotect(0x562823008000, 4096, PROT_READ) = 0

mprotect(0x7fa7eb330000, 8192, PROT_READ) = 0

prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0

munmap(0x7fa7eb2ed000, 34979) = 0

exit_group(0) = ?

+++ exited with 0 +++

確認用

Q. strace

参考

調査用

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