21 lines
876 B
Plaintext
21 lines
876 B
Plaintext
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__syscall2
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==========
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:title: Shellcode Compiler Runtime
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---------------------------------------------
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long __syscall2(long& ret2, long num, ...);
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---------------------------------------------
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Issues system call number `num` on the target platform, expecting two return values instead of one.
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Any additional arguments are passed directly to the system call. Returns the first half of the result
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of the system call, with the second half of the result placed into the `ret2` variable.
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IMPORTANT: On platforms that set a processor flag on error, such as FreeBSD, the `__syscall` function
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will return the negation of the error code on error. This is to allow for unified behaviour across
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different platforms. For example, checking the result of the `open` call for `-ENOENT` will work
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across all supported UNIX-based platforms.
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See also
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--------
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link:syscall.html[syscall]
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