“用力过猛”的现代操作系统

donothing.rs

// craete rs do nothing 

fn main() {
    // do nothing
}

Then build this code with rustc donothing.rs

and run ./donothing

Obviously , nothing printed. But strace is

zongbao@lixiang:~/lixiang/os
> strace ./donothing 
execve("./donothing", ["./donothing"], 0x7ffd36da5f70 /* 64 vars */) = 0
brk(NULL)                               = 0x561dd24d8000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
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
fstat(3, {st_mode=S_IFREG|0644, st_size=222979, ...}) = 0
mmap(NULL, 222979, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f6a41bc6000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libgcc_s.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\300*\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=96616, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6a41bc4000
mmap(NULL, 2192432, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f6a417bc000
mprotect(0x7f6a417d3000, 2093056, PROT_NONE) = 0
mmap(0x7f6a419d2000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x7f6a419d2000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/librt.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\0\"\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=31680, ...}) = 0
mmap(NULL, 2128864, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f6a415b4000
mprotect(0x7f6a415bb000, 2093056, PROT_NONE) = 0
mmap(0x7f6a417ba000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f6a417ba000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/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\0000b\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=144976, ...}) = 0
mmap(NULL, 2221184, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f6a41395000
mprotect(0x7f6a413af000, 2093056, PROT_NONE) = 0
mmap(0x7f6a415ae000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19000) = 0x7f6a415ae000
mmap(0x7f6a415b0000, 13440, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f6a415b0000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/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\0P\16\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=14560, ...}) = 0
mmap(NULL, 2109712, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f6a41191000
mprotect(0x7f6a41194000, 2093056, PROT_NONE) = 0
mmap(0x7f6a41393000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f6a41393000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
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\0\20\35\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2030928, ...}) = 0
mmap(NULL, 4131552, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f6a40da0000
mprotect(0x7f6a40f87000, 2097152, PROT_NONE) = 0
mmap(0x7f6a41187000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1e7000) = 0x7f6a41187000
mmap(0x7f6a4118d000, 15072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f6a4118d000
close(3)                                = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6a41bc2000
arch_prctl(ARCH_SET_FS, 0x7f6a41bc3240) = 0
mprotect(0x7f6a41187000, 16384, PROT_READ) = 0
mprotect(0x7f6a41393000, 4096, PROT_READ) = 0
mprotect(0x7f6a415ae000, 4096, PROT_READ) = 0
mprotect(0x7f6a417ba000, 4096, PROT_READ) = 0
mprotect(0x7f6a419d2000, 4096, PROT_READ) = 0
mprotect(0x561dd1480000, 12288, PROT_READ) = 0
mprotect(0x7f6a41bfd000, 4096, PROT_READ) = 0
munmap(0x7f6a41bc6000, 222979)          = 0
set_tid_address(0x7f6a41bc3510)         = 5299
set_robust_list(0x7f6a41bc3520, 24)     = 0
rt_sigaction(SIGRTMIN, {sa_handler=0x7f6a4139acb0, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f6a413a7980}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7f6a4139ad50, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f6a413a7980}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
poll([{fd=0, events=0}, {fd=1, events=0}, {fd=2, events=0}], 3, 0) = 0 (Timeout)
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[PIPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6a40ddf040}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
brk(NULL)                               = 0x561dd24d8000
brk(0x561dd24f9000)                     = 0x561dd24f9000
openat(AT_FDCWD, "/proc/self/maps", O_RDONLY|O_CLOEXEC) = 3
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(3, "561dd123f000-561dd1281000 r-xp 0"..., 1024) = 1024
read(3, " 00003000 103:03 1445170        "..., 1024) = 1024
read(3, "417ba000-7f6a417bb000 r--p 00006"..., 1024) = 1024
read(3, "ff000-7f6a41c00000 rw-p 00000000"..., 1024) = 367
close(3)                                = 0
sched_getaffinity(5299, 32, [0, 1, 2, 3, 4, 5, 6, 7]) = 8
rt_sigaction(SIGSEGV, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGSEGV, {sa_handler=0x561dd125d3f0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_SIGINFO, sa_restorer=0x7f6a413a7980}, NULL, 8) = 0
rt_sigaction(SIGBUS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGBUS, {sa_handler=0x561dd125d3f0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_SIGINFO, sa_restorer=0x7f6a413a7980}, NULL, 8) = 0
sigaltstack(NULL, {ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=0}) = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6a41bfa000
mprotect(0x7f6a41bfa000, 4096, PROT_NONE) = 0
sigaltstack({ss_sp=0x7f6a41bfb000, ss_flags=0, ss_size=8192}, NULL) = 0
sigaltstack({ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=8192}, NULL) = 0
munmap(0x7f6a41bfa000, 12288)           = 0
exit_group(0)                           = ?
+++ exited with 0 +++

zongbao@lixiang:~/lixiang/os
> size donothing
   text	   data	    bss	    dec	    hex	filename
 266383	  10256	    544	 277183	  43abf	donothing