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syscall LIST
Calls the system call specified as the first element of the list, passing
the remaining elements as arguments to the system call. If unimplemented,
produces a fatal error. The arguments are interpreted as follows: if a
given argument is numeric, the argument is passed as an int. If not, the
pointer to the string value is passed. You are responsible to make sure a
string is pre-extended long enough to receive any result that might be
written into a string. If your integer arguments are not literals and have
never been interpreted in a numeric context, you may need to add 0 to them
to force them to look like numbers.
require 'syscall.ph'; # may need to run h2ph
syscall(&SYS_write, fileno(STDOUT), "hi there\n", 9);
Note that Perl supports passing of up to only 14 arguments to your system
call, which in practice should usually suffice.
Source: Perl builtin functions
Copyright: Larry Wall, et al. |
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