diff options
| author | Thomas Weißschuh <linux@weissschuh.net> | 2026-04-05 11:06:25 +0200 |
|---|---|---|
| committer | Thomas Weißschuh <linux@weissschuh.net> | 2026-04-07 09:27:07 +0200 |
| commit | 2eb64b936d3b6332ae44bbf91277f912be5597e2 (patch) | |
| tree | 2fdd762a025fae411bc8bb2572a7beb66c447d6f /tools/include | |
| parent | 022bbb5a41fd6463887dfb7de22f5be8262239a7 (diff) | |
tools/nolibc: add the _syscall() macro
The standard syscall() function or macro uses the libc return value
convention. Errors returned from the kernel as negative values are
stored in errno and -1 is returned. Users who want to avoid using
errno don't have a way to call raw syscalls and check the returned
error.
Add a new macro _syscall() which works like the standard syscall()
but passes through the return value from the kernel unchanged.
The naming scheme and return values match the named _sys_foo()
system call wrappers already part of nolibc.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20260405-nolibc-syscall-v1-3-e5b12bc63211@weissschuh.net
Diffstat (limited to 'tools/include')
| -rw-r--r-- | tools/include/nolibc/sys/syscall.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/include/nolibc/sys/syscall.h b/tools/include/nolibc/sys/syscall.h index 3f43fac3d7b8..7f06314fcf0d 100644 --- a/tools/include/nolibc/sys/syscall.h +++ b/tools/include/nolibc/sys/syscall.h @@ -14,6 +14,7 @@ #define __nolibc_syscall_narg(...) ___nolibc_syscall_narg(__VA_ARGS__, 6, 5, 4, 3, 2, 1, 0) #define __nolibc_syscall(N, ...) __nolibc_syscall##N(__VA_ARGS__) #define __nolibc_syscall_n(N, ...) __nolibc_syscall(N, __VA_ARGS__) -#define syscall(...) __sysret(__nolibc_syscall_n(__nolibc_syscall_narg(__VA_ARGS__), ##__VA_ARGS__)) +#define _syscall(...) __nolibc_syscall_n(__nolibc_syscall_narg(__VA_ARGS__), ##__VA_ARGS__) +#define syscall(...) __sysret(_syscall(__VA_ARGS__)) #endif /* _NOLIBC_SYS_SYSCALL_H */ |