This removes the data race caused by multiple threads using the
unprotected global `random_string_seed`, so long as no two threads share
the same random generator; this is the default case.
Additionally, `os2.random_string` now takes into account the full buffer
slice given to it.
`strings.to_cstring` previously would not check if the buffer could
handle the extra null byte and could lead to segmentation violations
when using the resulting string in an API expecting the terminator.
Adds a directory walker, a method of exposing and retrieving errors from
the existing read directory iterator, allows reusing of the existing
read directory iterator, and adds a file clone procedure
The `dir_fd` argument to `execveat()` is not for setting the current working
directory. It is used to resolve relative executable paths, hence explicit
`chdir/fchdir` call is required to set CWD.
os.args is never freed, while this is an insignificant leak, it is a bit
annoying as it makes valgrind complain:
==234270== Memcheck, a memory error detector
==234270== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al.
==234270== Using Valgrind-3.24.0 and LibVEX; rerun with -h for copyright info
==234270== Command: ./wc /tmp/mulumulu
==234270==
1 8 58 /tmp/mulumulu
==234270==
==234270== HEAP SUMMARY:
==234270== in use at exit: 47 bytes in 1 blocks
==234270== total heap usage: 5 allocs, 4 frees, 4,195,875 bytes allocated
==234270==
==234270== 47 bytes in 1 blocks are possibly lost in loss record 1 of 1
==234270== at 0x484BC13: calloc (vg_replace_malloc.c:1675)
==234270== by 0x402E49: runtime._heap_alloc-769 (in /d/learn-odin/wc/wc)
==234270== by 0x40A8D7: runtime.heap_alloc (in /d/learn-odin/wc/wc)
==234270== by 0x436E9D: runtime.heap_allocator_proc.aligned_alloc-0 (in /d/learn-odin/wc/wc)
==234270== by 0x4022DC: runtime.heap_allocator_proc (in /d/learn-odin/wc/wc)
==234270== by 0x4165E0: runtime.make_aligned-22560 (in /d/learn-odin/wc/wc)
==234270== by 0x41F6D0: runtime.make_slice-22340 (in /d/learn-odin/wc/wc)
==234270== by 0x40156B: os._alloc_command_line_arguments-4679 (in /d/learn-odin/wc/wc)
==234270== by 0x4011AF: __$startup_runtime (in /d/learn-odin/wc/wc)
==234270== by 0x406F17: main (in /d/learn-odin/wc/wc)
==234270==
==234270== LEAK SUMMARY:
==234270== definitely lost: 0 bytes in 0 blocks
==234270== indirectly lost: 0 bytes in 0 blocks
==234270== possibly lost: 47 bytes in 1 blocks
==234270== still reachable: 0 bytes in 0 blocks
==234270== suppressed: 0 bytes in 0 blocks
==234270==
==234270== For lists of detected and suppressed errors, rerun with: -s
==234270== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
With the fix the leak is gone, tested on linux only.
While here, also make _alloc_command_line_arguments() private.
Readded open flags for arm64 to sys/linux/bits.odin. Make process_start
name based instead of descriptor based to allow running of scripts. Fix
bug in heap_linux. Fix and simplify os2.remove.
