Issue #3034 has been updated by daftaupe.
After looking at this issue, it seems that it's because /proc/curproc/map has a
size of 0.
In the forward.c code, in that case we're at line 150, calling function rlines
: rlines(fp, off, sbp);
But this function starts with a test :
if (!(size = sbp->st_size))
return;
and as the size of the file is 0 it returns immediately and display the whole
file instead of the number of lines specified on the cli.
The call of display_lines(fp, off) instead of rlines(fp, off, sbp) seems to fix
this issue.
----------------------------------------
Bug #3034: Tail -n 1 don't work on /proc/curproc/map
http://bugs.dragonflybsd.org/issues/3034#change-13327
* Author: cpk
* Status: New
* Priority: Normal
* Assignee:
* Category: VFS subsystem
* Target version:
----------------------------------------
If i run tail -n 1 /proc/curproc/map it will print 10 last lines.(wc says it is
11 but something is wrong here)
But then if i redirect output to file and then tail it it will print correct
number of lines.
tail -n 1 /proc/curproc/map |wc -l
11 143 1111
tail -n 1 /proc/curproc/map > /tmp/tail-bug && tail -n 1 /tmp/tail-bug |wc
1 13 95
uname -a
DragonFly dfly-0 4.6-RELEASE DragonFly v4.6.0rc2-RELEASE #2: Sun Jul 24
14:47:27 EDT 2016
[email protected]:/usr/obj/home/justin/release/4_6/sys/X86_64_GENERIC
x86_64
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