head is struggling to read files from /proc #5703
Description
The following will work:
$ cp /proc/version copy
$ ./target/debug/coreutils head -c -1 copy
Linux version 6.5.0-4-amd64 (debian-kernel@lists.debian.org) (gcc-13 (Debian 13.2.0-6) 13.2.0, GNU ld (GNU Binutils for Debian) 2.41) #1 SMP PREEMPT_DYNAMIC Debian 6.5.10-1 (2023-11-03)
while the following is failing:
$ ./target/debug/coreutils head -c -1 /proc/version
with GNU:
$ /usr/bin/head -c -1 /proc/version
Linux version 6.5.0-4-amd64 (debian-kernel@lists.debian.org) (gcc-13 (Debian 13.2.0-6) 13.2.0, GNU ld (GNU Binutils for Debian) 2.41) #1 SMP PREEMPT_DYNAMIC Debian 6.5.10-1 (2023-11-03)