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author | Zhangjin Wu <falcon@tinylab.org> | 2023-07-07 17:56:59 +0300 |
---|---|---|
committer | Willy Tarreau <w@1wt.eu> | 2023-08-23 05:38:02 +0300 |
commit | 6591be4a73feb955a107c70c7e5b621a97a2eb4b (patch) | |
tree | 7c90f1c723fca70f7009cd15b2783e38ed332efb | |
parent | 6d1970e1efc8696bc8c4b8d36c9680882cb2c849 (diff) | |
download | linux-6591be4a73feb955a107c70c7e5b621a97a2eb4b.tar.xz |
tools/nolibc: __sysret: support syscalls who return a pointer
No official reference states the errno range, here aligns with musl and
glibc and uses [-MAX_ERRNO, -1] instead of all negative ones.
- musl: src/internal/syscall_ret.c
- glibc: sysdeps/unix/sysv/linux/sysdep.h
The MAX_ERRNO used by musl and glibc is 4095, just like the one nolibc
defined in tools/include/nolibc/errno.h.
Suggested-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/lkml/ZKKdD%2Fp4UkEavru6@1wt.eu/
Suggested-by: David Laight <David.Laight@ACULAB.COM>
Link: https://lore.kernel.org/linux-riscv/94dd5170929f454fbc0a10a2eb3b108d@AcuMS.aculab.com/
Signed-off-by: Zhangjin Wu <falcon@tinylab.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
-rw-r--r-- | tools/include/nolibc/sys.h | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h index 53bc3ad6593e..3479f54d7957 100644 --- a/tools/include/nolibc/sys.h +++ b/tools/include/nolibc/sys.h @@ -28,13 +28,20 @@ #include "errno.h" #include "types.h" -/* Syscall return helper, set errno as -ret when ret < 0 */ + +/* Syscall return helper for library routines, set errno as -ret when ret is in + * range of [-MAX_ERRNO, -1] + * + * Note, No official reference states the errno range here aligns with musl + * (src/internal/syscall_ret.c) and glibc (sysdeps/unix/sysv/linux/sysdep.h) + */ + static __inline__ __attribute__((unused, always_inline)) -long __sysret(long ret) +long __sysret(unsigned long ret) { - if (ret < 0) { - SET_ERRNO(-ret); - ret = -1; + if (ret >= (unsigned long)-MAX_ERRNO) { + SET_ERRNO(-(long)ret); + return -1; } return ret; } |