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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>
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#include "errno.h"
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#include "errno.h"
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#include "types.h"
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#include "types.h"
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/* Syscall return helper, set errno as -ret when ret < 0 */
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static __inline__ __attribute__((unused, always_inline))
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long __sysret(long ret)
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{
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if (ret < 0) {
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SET_ERRNO(-ret);
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ret = -1;
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}
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return ret;
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}
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/* Functions in this file only describe syscalls. They're declared static so
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/* Functions in this file only describe syscalls. They're declared static so
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* that the compiler usually decides to inline them while still being allowed
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* that the compiler usually decides to inline them while still being allowed
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