| 1 | use super::weak; |
| 2 | |
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| 3 | pub(crate) macro syscall { |
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| 4 | ( |
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| 5 | fn $name:ident($($param:ident : $t:ty),* $(,)?) -> $ret:ty; |
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| 6 | ) => ( |
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| 7 | unsafe fn $name($($param: $t),*) -> $ret { |
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| 8 | weak!(fn $name($($param: $t),*) -> $ret;); |
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| 9 | |
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| 10 | // Use a weak symbol from libc when possible, allowing `LD_PRELOAD` |
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| 11 | // interposition, but if it's not found just use a raw syscall. |
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| 12 | if let Some(fun) = $name.get() { |
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| 13 | unsafe { fun($($param),*) } |
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| 14 | } else { |
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| 15 | unsafe { libc::syscall(libc::${concat(SYS_, $name)}, $($param),*) as $ret } |
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| 16 | } |
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| 17 | } |
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| 18 | ) |
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| 19 | } |
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| 20 | |
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