On Dec 12, 2010, at 4:49 PM, Jonathan Nieder wrote:
> Hmm. Any idea why dd is ending early?
No idea.
> Does using
>
> head -c "$size" >blob <&3 &&
Yes.
> dd of=blob bs=1 count=$size <&3 &&
>
> in its place work?
Yes.
> What does the Mac OS X equivalent of
>
> strace dd of=blob bs=$size count=1 <&3
>
> (dtrace or ktrace, I guess) tell?
The moral equivalent seems to be "dtruss" (which I think is a front end to DTrace) in modern OS X.
0+1 records in
0+1 records out
8139 bytes transferred in 0.000205 secs (39694698 bytes/sec)
SYSCALL(args) = return
ioctl(0x6, 0x80086804, 0x7FFF5FBFD0A0) = 0 0
close(0x6) = 0 0
__sysctl(0x7FFF5FBFCF90, 0x2, 0x7FFF5FBFCF80) = 0 0
bsdthread_register(0x7FFF852F43DC, 0x7FFF852D4FF8, 0x2000) = 0 0
thread_selfid(0x7FFF852F43DC, 0x7FFF852D4FF8, 0x0) = 1850088 0
open_nocancel("/dev/urandom\0", 0x0, 0x7FFF70ABABE0) = 6 0
read_nocancel(0x6, "\350>6\026\310R\251_\227\213h\237\304\330&Q-\247\0313\020BnH\277\337z\276c\247\206\017\340/\302} \2644\273\003\252`\363d8\252\247)V2\323\021\320\\\214\001\331\226\020RY\024I\0", 0x40) = 64 0
close_nocancel(0x6) = 0 0
mmap(0x0, 0x3000, 0x3, 0x1002, 0x1000000, 0x7FFF00000001) = 0xD000 0
__sysctl(0x7FFF5FBFCE10, 0x2, 0x7FFF5FBFCDD0) = 0 0
__sysctl(0x7FFF5FBFCDD0, 0x2, 0x7FFF5FBFCE68) = 0 0
getpid(0x7FFF5FBFCD60, 0x7FFFFFE00050, 0x0) = 94596 0
open_nocancel("/dev/urandom\0", 0x0, 0x0) = 6 0
read_nocancel(0x6, "\253\331\354\357A)G\3256\222\024=\242E\261\301\314\351\017K\301;O\256I\270\301\312\263M\307\340+U\217\242\230\335\020\275\356T\323\334\312\313\331*\037\273K\332\a\247\323\324\377m\360\204\375c\026i\345\017x\2070n\026\266\027\021k\340( \245\337\3277H\214\0", 0x6C) = 108 0
close_nocancel(0x6) = 0 0
__sysctl(0x7FFF5FBFCE10, 0x2, 0x7FFF5FBFCE3C) = 0 0
mmap(0x0, 0x17000, 0x3, 0x1002, 0x1000000, 0x7FFF00000001) = 0x10000 0
mmap(0x0, 0x17000, 0x3, 0x1002, 0x1000000, 0x7FFF00000001) = 0x27000 0
mmap(0x0, 0x1000, 0x3, 0x1002, 0x1000000, 0x7FFF00000001) = 0x3E000 0
mmap(0x0, 0x200000, 0x3, 0x1002, 0x7000000, 0x7FFF00000001) = 0x3F000 0
munmap(0x10003F000, 0xC1000) = 0 0
munmap(0x100200000, 0x3F000) = 0 0
__sysctl(0x7FFF5FBFCF70, 0x2, 0x7FFF5FBFCF30) = 0 0
__sysctl(0x7FFF5FBFCF30, 0x2, 0x7FFF70AC7760) = 0 0
__sysctl(0x7FFF5FBFCF70, 0x2, 0x7FFF5FBFCF30) = 0 0
__sysctl(0x7FFF5FBFCF30, 0x2, 0x7FFF70AC7764) = 0 0
__sysctl(0x7FFF5FBFCF70, 0x2, 0x7FFF5FBFCF30) = 0 0
__sysctl(0x7FFF5FBFCF30, 0x2, 0x7FFF70AC7768) = 0 0
mmap(0x0, 0x3000, 0x3, 0x1002, 0x1000000, 0x7FFF00000001) = 0x3F000 0
__sysctl(0x7FFF5FBFCF40, 0x2, 0x7FFF5FBFCF00) = 0 0
__sysctl(0x7FFF5FBFCF00, 0x2, 0x7FFF5FBFCF98) = 0 0
__sysctl(0x7FFF5FBFCF40, 0x2, 0x7FFF5FBFCF6C) = 0 0
mmap(0x0, 0x17000, 0x3, 0x1002, 0x1000000, 0x7FFF00000001) = 0x42000 0
mmap(0x0, 0x17000, 0x3, 0x1002, 0x1000000, 0x7FFF00000001) = 0x59000 0
mmap(0x0, 0x200000, 0x3, 0x1002, 0x7000000, 0x7FFF00000001) = 0x200000 0
munmap(0x100300000, 0x100000) = 0 0
fstat64(0x0, 0x7FFF5FBFF320, 0x17FFF) = 0 0
lseek(0x0, 0x0, 0x1) = -1 Err#29
open("blob\0", 0x602, 0x1B6) = 6 0
fstat64(0x6, 0x7FFF5FBFF320, 0x0) = 0 0
lseek(0x6, 0x0, 0x1) = 0 0
mmap(0x0, 0x58000, 0x3, 0x1002, 0x3000000, 0x7FFF00000000) = 0x70000 0
mmap(0x0, 0x1000, 0x3, 0x1002, 0x3000000, 0x7FFF00000000) = 0xC8000 0
sigaction(0x1D, 0x7FFF5FBFF380, 0x7FFF5FBFF3B0) = 0 0
sigaction(0x2, 0x7FFF5FBFF380, 0x7FFF5FBFF3B0) = 0 0
read(0x0, "the quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the l", 0x2C000) = 8139 0
write(0x6, "the quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the l", 0x1FCB) = 8139 0
write(0x2, "0+1 records in\n0+1 records out\n quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quic", 0x1F) = 31 0
write(0x2, "8139 bytes transferred in 0.000205 secs (39694698 bytes/sec)\nuick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jumps over the lazy dog\nthe quick brown fox jump", 0x3D) = 61 0
getpid(0x7FFF5FBFF250, 0x7FFFFFE00050, 0x0) = 94596 0
open_nocancel("/dev/urandom\0", 0x0, 0x0) = 6 0
read_nocancel(0x6, "\232/\226\373ld\353\r+l\236qV\317\370\271.0\353=\316\3464\t\263\262r\022\362w\360H\245LdE\3769\254\3309m\246I\361\374\307\342]6\n\337\303\310\333\332\036\327\313\224(\3443C\327\224\225\376\221\311-\323\272\344\275l\034\353LR<\236\t\202\250\353\202\276AS\363\023@\353\331[\037\bC\036)\336\363WZ\003\0", 0x6C) = 108 0
close_nocancel(0x6) = 0 0
issetugid(0x100000000, 0x7FFF5FBFF5B0, 0x7FFF5FC40530) = 0 0
geteuid(0x100000000, 0x7FFF5FBFF5B0, 0x0) = 0 0
__sysctl(0x7FFF5FBFD140, 0x2, 0x7FFF5FBFD100) = 0 0
__sysctl(0x7FFF5FBFD100, 0x2, 0x7FFF5FBFD19C) = 0 0
shared_region_check_np(0x7FFF5FBFD308, 0x0, 0x7FFF5FC1DC86) = 0 0
stat64("/usr/lib/dtrace/libdtrace_dyld.dylib\0", 0x7FFF5FBFC710, 0x7FFF5FBFCD50 = 0 0
open("/usr/lib/dtrace/libdtrace_dyld.dylib\0", 0x0, 0x0) = 6 0
pread(0x6, "\312\376\272\276\0", 0x1000, 0x0) = 4096 0
pread(0x6, "\317\372\355\376\a\0", 0x1000, 0x1000) = 4096 0
mmap(0x100008000, 0x2000, 0x5, 0x12, 0x6, 0x1FFFFFFFF) = 0x8000 0
mmap(0x10000A000, 0x1000, 0x3, 0x12, 0x6, 0x1FFFFFFFF) = 0xA000 0
mmap(0x10000B000, 0x1F10, 0x1, 0x12, 0x6, 0x1FFFFFFFF) = 0xB000 0
close(0x6) = 0 0
stat64("/usr/lib/libSystem.B.dylib\0", 0x7FFF5FBFC4C0, 0x7FFF5FBFCB00) = 0 0
stat64("/usr/lib/system/libmathCommon.A.dylib\0", 0x7FFF5FBFC370, 0x7FFF5FBFC9B0) = 0 0
madvise(0x7FFF89610000, 0x2000, 0x5) = 0 0
open("/dev/dtracehelper\0", 0x2, 0x7FFF5FC45258) = 6 0
ioctl(0x6, 0x80086804, 0x7FFF5FBFD0A0) = 0 0
close(0x6) = 0 0
stat64("/usr/lib/libstdc++.6.dylib\0", 0x7FFF5FBFC4B0, 0x7FFF5FBFCAF0) = 0 0
open("/dev/dtracehelper\0", 0x2, 0x7FFF5FC45320) = 6 0
error: git-fast-import died of signal 13
---- 8< ----
blob does exist, it just seems to end early:
--- big 2010-12-12 16:56:32.000000000 -0500
+++ blob 2010-12-12 16:56:33.000000000 -0500
@@ -182,3915 +182,4 @@
Followed by many lines of:
-the quick brown fox jumps over the lazy dog
and then:
+the quick brown fox jumps over the lazy dog
\ No newline at end of file
> Thanks for noticing.
I tend to update to latest next, compile, and test about once a day so exactly so I can catch things. :-D
~~ Brian--
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