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418:417
 05/02/20 21:09:12 0sjUjbHi
つづき 
 
そこで、さらに詳細に状況を確認するためにstraceを使用してみました。 
$ strace ./testtool 
execve("./testtool", ["./testtool"], [/* 52 vars */]) = 0 
brk(0)                                  = 0x8049a6c 
open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT (No such file or directory) 
open("/etc/ld.so.cache", O_RDONLY)      = 3 
fstat64(3, {st_mode=S_IFREG|0644, st_size=62075, ...}) = 0 
old_mmap(NULL, 62075, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40013000 
close(3)                                = 0 
open("/lib/libc.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\0DU\1\000"..., 1024) = 1024 
fstat64(3, {st_mode=S_IFREG|0755, st_size=1333605, ...}) = 0 
old_mmap(NULL, 1145796, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40023000 
mprotect(0x40134000, 27588, PROT_NONE)  = 0 
old_mmap(0x40134000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x110000) = 0x40134000 
old_mmap(0x40139000, 7108, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40139000 
close(3)                                = 0 
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4013b000 
munmap(0x40013000, 62075)               = 0 
open("/dev/testdev", O_RDWR)            = 3 
ioctl(3, FIBMAP, 0xbffff1d8)            = -1 ENOTTY (Inappropriate ioctl for device) 
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 2), ...}) = 0 
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40013000 
write(1, "errno = 25\n", 11errno = 25 
)            = 11

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