Missing POSIX APIs

While Redox's aim is not full POSIX compatibility, there are lots of missing APIs that generally only come with benefits.

Non-exhaustive list:

• UTIME_OMIT and UTIME_NOW (#172 (closed))
• some networking constants (#164 (closed))

https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_mman.h.html

• some sys/mman.h defs (#73)

https://pubs.opengroup.org/onlinepubs/009604499/functions/wcswcs.html

• wcswcs considered legacy, calls wcsstr

https://pubs.opengroup.org/onlinepubs/9799919799/functions/wcsstr.html

• wcsstr (0b2c3fe5)

https://pubs.opengroup.org/onlinepubs/9799919799/functions/wcsxfrm.html

• wcsxfrm
• wcsxfrm_l

https://pubs.opengroup.org/onlinepubs/9799919799/functions/wcsftime.html

• wcsftime

https://pubs.opengroup.org/onlinepubs/9799919799/functions/mknod.html

• mknod (!442 (merged))
• mknodat (!442 (merged))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/wctrans.html

• wctrans (!356 (merged))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/towctrans.html

• towctrans (!356 (merged))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/ungetwc.html

• ungetwc (!390 (merged))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/wcsrtombs.html

• wcsrtombs (!388 (merged))
• wcsnrtombs (!426 (merged))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/fwprintf.html

• wprintf (!352 (merged))
• swprintf calls vswprintf?
• fwprintf calls vfwprintf

https://pubs.opengroup.org/onlinepubs/9799919799/functions/vfwprintf.html

• vfwprintf (!352 (merged))
• vwprintf calls vfwprintf
• vswprintf

https://pubs.opengroup.org/onlinepubs/9799919799/functions/fwscanf.html

• wscanf (!613 (merged))
• swscanf (!472 (merged))
• fwscanf

https://pubs.opengroup.org/onlinepubs/9799919799/functions/vfwscanf.html

• vfwscanf
• vswscanf (!472 (merged))
• vwscanf (!613 (merged))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/alarm.html

• alarm calls setitimer which is depreciated (#210)

https://pubs.opengroup.org/onlinepubs/9799919799/functions/timer_create.html

• timer_create

https://pubs.opengroup.org/onlinepubs/9799919799/functions/confstr.html

• confstr (!364 & !694 (merged))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/waitid.html

• waitid (!402)

https://pubs.opengroup.org/onlinepubs/9799919799/functions/posix_spawn.html

• posix_spawn (#192)
• posix_spawnp

https://pubs.opengroup.org/onlinepubs/9799919799/functions/shm_open.html

• shm_open (cea5101c) calls fcntl

https://pubs.opengroup.org/onlinepubs/9799919799/functions/fcntl.html

• fcntl (!440 (merged))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/mkdir.html

• mkdir
• mkdirat (#103)

https://pubs.opengroup.org/onlinepubs/9799919799/functions/getgroups.html

• getgroups

https://pubs.opengroup.org/onlinepubs/9799919799/functions/getrlimit.html

• getrlimit
• setrlimit

https://pubs.opengroup.org/onlinepubs/9799919799/functions/getrusage.html

• getrusage

https://pubs.opengroup.org/onlinepubs/9799919799/functions/getpriority.html

• getpriority
• setpriority

https://pubs.opengroup.org/onlinepubs/9799919799/functions/clock_getres.html

• clock_getres (!389 (merged))
• clock_gettime (libredox@9904ebe0)
• clock_settime (!389 (merged))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/posix_madvise.html

• posix_madvise (!357 (merged))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/msync.html

• msync (2ac349d2)

https://pubs.opengroup.org/onlinepubs/9799919799/functions/open.html

• open
• openat (!668)

https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/utmpx.h.html

• utmpx.h (redox#1716 (moved))

https://pubs.opengroup.org/onlinepubs/9799919799/functions/fstatat.html

• fstatat (#103 & !695 (merged))
• lstat (ff32c8cb)
• stat (ff32c8cb)

https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/dirent.h.html

• finish implementation (#220)

https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/fcntl.h.html

• finish implementation (#221)

Crates that need fixing

• fs_at (redox#1461)
• interprocess (redox#1488)
• systemstat (redox#1485)
• if-addrs (redox#1483)
• realm_syscall (redox#1475)
• pnet_sys (redox#1474)

Non POSIX

• wait3 BSD extension to POSIX waitpid (#170)
• malloc.h Non standard, platform specific. Should use POSIX stdlib.h instead. (#136)

Not all POSIX APIs are available as stubs, but those that are, can be found by looking for commented-out #[no_mangle], e.g. via rg '^.*//.*#\[no_mangle\]'.

There are some POSIX requirements that will be much harder to fix. First, the current context=process=thread assumption must be dealt with. Second, POSIX appears to allow all characters but NUL and '/', which conflicts with how schemes work (even returning an error due to lack of support for : in the filesystem, doesn't apply, as it will work but the behavior will be different).

Reference

Almost all POSIX functions are well-documented on the following links:

• OpenGroup
• cppreference.com