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| author | Zhangjin Wu <falcon@tinylab.org> | 2023-06-28 16:08:32 +0300 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2023-08-06 13:27:53 +0300 |
| commit | 428905da6ec4a02d08dfcc09013035594f666a31 (patch) | |
| tree | 482ca414d932f5a87f8b2c483a2ca7135718f96e /tools/include | |
| parent | 2f98aca8aaef0fca36adff5c478af1788997debd (diff) | |
| download | linux-428905da6ec4a02d08dfcc09013035594f666a31.tar.xz | |
tools/nolibc: sys.h: add a syscall return helper
Most of the library routines share the same syscall return logic:
In general, a 0 return value indicates success. A -1 return value
indicates an error, and an error number is stored in errno. [1]
Let's add a __sysret() helper for the above logic to simplify the coding
and shrink the code lines too.
Thomas suggested to use inline function instead of macro for __sysret().
Willy suggested to make __sysret() be always inline.
[1]: https://man7.org/linux/man-pages/man2/syscall.2.html
Suggested-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/linux-riscv/ZH1+hkhiA2+ItSvX@1wt.eu/
Suggested-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/linux-riscv/ea4e7442-7223-4211-ba29-70821e907888@t-8ch.de/
Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Zhangjin Wu <falcon@tinylab.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'tools/include')
| -rw-r--r-- | tools/include/nolibc/sys.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h index 5464f93e863e..097eef88cf7e 100644 --- a/tools/include/nolibc/sys.h +++ b/tools/include/nolibc/sys.h @@ -28,6 +28,16 @@ #include "errno.h" #include "types.h" +/* Syscall return helper, set errno as -ret when ret < 0 */ +static __inline__ __attribute__((unused, always_inline)) +long __sysret(long ret) +{ + if (ret < 0) { + SET_ERRNO(-ret); + ret = -1; + } + return ret; +} /* Functions in this file only describe syscalls. They're declared static so * that the compiler usually decides to inline them while still being allowed |