Viewing file:  go-varargs.c (2.59 KB) -rw-r--r--
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/* go-varargs.c -- functions for calling C varargs functions.
Copyright 2013 The Go Authors. All rights reserved.
Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file. */
#include "config.h"
#include <errno.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYSCALL_H
#include <syscall.h>
#endif
#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#ifdef HAVE_SYS_PTRACE_H
#include <sys/ptrace.h>
#endif
/* The syscall package calls C functions. The Go compiler can not
represent a C varargs functions. On some systems it's important
that the declaration of a function match the call. This function
holds non-varargs C functions that the Go code can call. */
int
__go_open (char *path, int mode, mode_t perm)
{
return open (path, mode, perm);
}
int
__go_fcntl (int fd, int cmd, int arg)
{
return fcntl (fd, cmd, arg);
}
int
__go_fcntl_flock (int fd, int cmd, struct flock *arg)
{
return fcntl (fd, cmd, arg);
}
// This is for the net package. We use uintptr_t to make sure that
// the types match, since the Go and C "int" types are not the same.
struct go_fcntl_ret {
uintptr_t r;
uintptr_t err;
};
struct go_fcntl_ret
__go_fcntl_uintptr (uintptr_t fd, uintptr_t cmd, uintptr_t arg)
{
int r;
struct go_fcntl_ret ret;
r = fcntl ((int) fd, (int) cmd, (int) arg);
ret.r = (uintptr_t) r;
if (r < 0)
ret.err = (uintptr_t) errno;
else
ret.err = 0;
return ret;
}
int
__go_ioctl (int d, int request, int arg)
{
return ioctl (d, request, arg);
}
int
__go_ioctl_ptr (int d, int request, void *arg)
{
return ioctl (d, request, arg);
}
#ifdef HAVE_OPEN64
int
__go_open64 (char *path, int mode, mode_t perm)
{
return open64 (path, mode, perm);
}
#endif
#ifdef HAVE_OPENAT
int
__go_openat (int fd, char *path, int flags, mode_t mode)
{
return openat (fd, path, flags, mode);
}
#endif
#ifdef HAVE_SYSCALL
// __go_syscall6 is called by both the runtime and syscall packages.
// We use uintptr_t to make sure that the types match, since the Go
// and C "int" types are not the same.
uintptr_t
__go_syscall6(uintptr_t flag, uintptr_t a1, uintptr_t a2, uintptr_t a3,
uintptr_t a4, uintptr_t a5, uintptr_t a6)
{
return syscall (flag, a1, a2, a3, a4, a5, a6);
}
#endif
#if defined(HAVE_SYS_PTRACE_H) && defined(__linux__)
// Despite documented appearances, this is actually implemented as
// a variadic function within glibc on Linux.
long
__go_ptrace(int request, pid_t pid, void *addr, void *data)
{
return ptrace (request, pid, addr, data);
}
#endif
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