busybox-w32/win32/mingw.c, branch cron_changesA mirror of https://github.com/rmyorston/busybox-w32.git
https://git.lua4.win/busybox-w32/atom?h=cron_changes2026-05-04T10:51:00+00:00win32: add FAST_FUNC annotations2026-05-04T10:51:00+00:00Ron Yorstonrmy@pobox.com2026-05-04T10:51:00+00:00urn:sha1:f26b970e4d22e1b2e3ca6209c3412fa0f683d953
I've been far too lax in applying FAST_FUNC annotations. These
can make function calls smaller and faster, but only on 32-bit
systems and for non-static, non-variadic functions with non-void
arguments.
Saves 4680 bytes in the 32-bit build; 64-bit builds are unaffected.
win32: disable urandom/zero devices if dd is disabled2026-04-27T07:40:06+00:00Ron Yorstonrmy@pobox.com2026-04-27T07:40:06+00:00urn:sha1:750a5e863cc04584ba50722d8b003e279cd67d24
Support for /dev/urandom and /dev/zero relies on having a working
dd. If the dd applet is disabled attempts to access them should
fail.
Theoretically a third-party dd utility could also work, but let's
not encourage that sort of heresy.
win32: improve urandom/zero device handling2026-04-26T19:49:26+00:00Ron Yorstonrmy@pobox.com2026-04-26T19:49:26+00:00urn:sha1:164015bc98835934ed6437107d874e6987ad9418
Rearrange the code to avoid a superfluous process creation.
Saves 16 bytes in the 64-bit build, adds 24 in the 32-bit.
win32: expose /dev/urandom and /dev/zero2026-04-26T09:59:27+00:00Ron Yorstonrmy@pobox.com2026-04-26T09:59:27+00:00urn:sha1:354d8e9e6b7367f081cfa57130fea4abf23f9bb3
Previously the special devices /dev/urandom and /dev/zero could
only be used via the 'dd' applet. They were also used internally
by some applets.
Expose /dev/urandom and /dev/zero so they can be used as file
arguments to applets and a source of redirections in the shell.
They're also now visible to 'stat' and 'ls', but only if given
as an explicit argument.
Adds 122-144 bytes.
(GitHub issues #98, #282)
ash: allow 'times' built-in to report process timing2026-04-12T10:49:29+00:00Ron Yorstonrmy@pobox.com2026-04-12T10:49:29+00:00urn:sha1:333c65ca71f1acb2cc6cd3920a346bb8ddf82dec
Move existing code which obtains process execution times into a
separate function. Use it to allow times(2) to report execution
times for the current process, though not child execution times.
Change TICKS_PER_SECOND from 100 to 1000 to increase the displayed
resolution of process times (though the measured resolution may
well be less than this).
Adds 48-80 bytes.
(GitHub issue #574)
win32: add support for /dev/std{in,out,err}2026-02-02T15:53:01+00:00Ron Yorstonrmy@pobox.com2026-02-02T15:53:01+00:00urn:sha1:8e6a6312552343aec7f5cde795ef0a11ef83b8ff
Allow applets to open the "files" /dev/stdin, /dev/stdout and
/dev/stderr. The 'stat' and 'ls' applets pretend they exist.
Adds 48-56 bytes.
win32: avoid failure when localtime() argument is out of range2025-11-26T12:56:11+00:00Ron Yorstonrmy@pobox.com2025-11-26T12:56:11+00:00urn:sha1:3b2f7ff1e0733c8224d0c6a0632abbbb87e8db91
The implementation of localtime(3) in the Microsoft Windows
runtime only accepts arguments between the Unix epoch (1970)
and either 2038 or 3000 for 32-bit or 64-bit systems respectively.
For values outside those limits it returns a NULL pointer.
Unfortunately, upstream BusyBox hardly ever bothers to check the
return value. Thus, when a call to stat(2) returned an all-zero
FILETIME for a file, the 'stat' applet failed. An all-zero FILETIME
represents a date in 1600, which is clearly before the Unix epoch.
Add a wrapper to localtime(3) which detects an out-of-range value
and returns a valid 'struct tm' for the Unix epoch. This is easier
than adding checks on the return value of every call to localtime(3).
Adds 32-48 bytes.
(GitHub issue #548)
mkdir: correctly report directory creation2025-11-22T09:22:28+00:00Ron Yorstonrmy@pobox.com2025-11-22T09:22:28+00:00urn:sha1:18ad143f86ded661ae4d2bef0e3a36490e786963
It was found that 'mkdir -p --verbose C:/' incorrectly reported
that 'C:/' was created.
Commit 0e0b5e9ff8 (mingw.c: ignore EACCES from mkdir if directory
exists) fixed a failure to create directories but caused the
`mkdir` applet to issue the wrong diagnostic.
The underlying problem is in the Windows runtime implementation
of _mkdir(): it can return the wrong errno in some cases, EACCES
instead of EEXIST.
Having the mkdir(2) wrapper return the correct errno should fix
both the directory creation and verbose diagnostic problems.
The website referenced in the previous commit is no longer
available. archive.org has a copy:
https://web.archive.org/web/20150224075238/http://www.apijunkie.com/APIJunkie/blog/post/2009/12/22/_mkdir-C-runtime-library-function-might-return-unexpected-error-values.aspx
(GitHub issue #546)
win32: allow use of /dev/tty2025-11-10T11:33:33+00:00Ron Yorstonrmy@pobox.com2025-11-10T11:33:33+00:00urn:sha1:f53dbcb8edbcfdad1721d0f5c9e8a16d54e983dc
Treat /dev/tty as an alias for Windows' 'con' device. The code
is similar to that used for /dev/null.
Adds 24-48 bytes.
(GitHub issue #538)
win32: use RtlGenRandom for /dev/urandom2025-10-09T06:49:58+00:00Ron Yorstonrmy@pobox.com2025-10-09T06:49:58+00:00urn:sha1:255e7ea4e2a0e3d28c0abf2750f42713eff711d7
Use the (somewhat ancient) Microsoft RtlGenRandom() function to
provide random data for /dev/urandom.
Saves 176-240 bytes.
(GitHub issue #519)