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\section{Calling C from Go}
Must use a package
command cgo
Cgo enables the creation of Go packages that call C code.
Usage: cgo \[compiler options\] file.go
The compiler options are passed through uninterpreted when invoking gcc to compile the C parts of the package.
The input file.go is a syntactically valid Go source file that imports
the pseudo-package "C" and then refers to types such as C.size\_t,
variables such as C.stdout, or functions such as C.putchar.
If the import of "C" is immediately preceded by a comment, that comment
is used as a header when compiling the C parts of the package. For
example:
\begin{display}
// #include <stdio.h>
// #include <errno.h>
\end{display}
import "C"
C identifiers or field names that are keywords in Go can be accessed by
prefixing them with an underscore: if x points at a C struct with a
field named "type", x.\_type accesses the field.
To access a struct, union, or enum type directly, prefix it with
struct\_, union\_, or enum\_, as in C.struct\_stat.
Any C function that returns a value may be called in a multiple
assignment context to retrieve both the return value and the C errno
variable as an os.Error. For example:
n, err := C.atoi("abc")
Cgo transforms the input file into four output files: two Go source
files, a C file for 6c (or 8c or 5c), and a C file for gcc.
%The standard package makefile rules in Make.pkg automate the process of
%using cgo. See $GOROOT/misc/cgo/stdio and $GOROOT/misc/cgo/gmp for
%examples.
\section{Profiling}
6prof
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