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| author | Thomas Weißschuh <linux@weissschuh.net> | 2023-05-20 10:58:57 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2023-06-09 21:46:07 +0300 |
| commit | 53fcfafa8c5c848d4ef1712053f6ea23b263a0de (patch) | |
| tree | c5042791da95744d20aab9866faac3ba883e4bfe /tools/include | |
| parent | c22c7c81af4d061e484e0833fbc3418d0f3008d4 (diff) | |
| download | linux-53fcfafa8c5c848d4ef1712053f6ea23b263a0de.tar.xz | |
tools/nolibc/unistd: add syscall()
syscall() is used by "normal" libcs to allow users to directly call
syscalls.
By having the same syntax inside nolibc users can more easily write code
that works with different libcs.
The macro logic is adapted from systemtaps STAP_PROBEV() macro that is
released in the public domain / CC0.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'tools/include')
| -rw-r--r-- | tools/include/nolibc/unistd.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/tools/include/nolibc/unistd.h b/tools/include/nolibc/unistd.h index ac7d53d986cd..0e832e10a0b2 100644 --- a/tools/include/nolibc/unistd.h +++ b/tools/include/nolibc/unistd.h @@ -56,6 +56,21 @@ int tcsetpgrp(int fd, pid_t pid) return ioctl(fd, TIOCSPGRP, &pid); } +#define _syscall(N, ...) \ +({ \ + long _ret = my_syscall##N(__VA_ARGS__); \ + if (_ret < 0) { \ + SET_ERRNO(-_ret); \ + _ret = -1; \ + } \ + _ret; \ +}) + +#define _syscall_narg(...) __syscall_narg(__VA_ARGS__, 6, 5, 4, 3, 2, 1, 0) +#define __syscall_narg(_0, _1, _2, _3, _4, _5, _6, N, ...) N +#define _syscall_n(N, ...) _syscall(N, __VA_ARGS__) +#define syscall(...) _syscall_n(_syscall_narg(__VA_ARGS__), ##__VA_ARGS__) + /* make sure to include all global symbols */ #include "nolibc.h" |