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在执行strace -ttT date
时,我错过了很多可执行文件后的系统调用。在execve()之后,没有更多的系统调用将date
ELF从HDD复制到内存,这是否会在内核中发生?我以为我会看到很多IOCTL到硬盘控制器,每个字节都被逐块加载到内存中?为什么strace不显示HDD IOCTL系统调用?
16:00:00.505197 execve("/bin/date", ["date"], [/* 30 vars */]) = 0 <0.038088>
16:00:00.543671 brk(0) = 0x11b9000 <0.000074>
16:00:00.543915 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) <0.000077>
16:00:00.544187 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0f4083a000 <0.000076>
16:00:00.544416 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) <0.000018>
16:00:00.544543 open("/etc/ld.so.cache", O_RDONLY) = 3 <0.000059>