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[official-gcc.git] / libgo / runtime / go-varargs.c
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1 /* go-varargs.c -- functions for calling C varargs functions.
3 Copyright 2013 The Go Authors. All rights reserved.
4 Use of this source code is governed by a BSD-style
5 license that can be found in the LICENSE file. */
7 #include "config.h"
9 #include <errno.h>
10 #include <stdint.h>
11 #include <unistd.h>
12 #include <sys/types.h>
13 #include <fcntl.h>
14 #include <sys/ioctl.h>
15 #ifdef HAVE_SYSCALL_H
16 #include <syscall.h>
17 #endif
18 #ifdef HAVE_SYS_SYSCALL_H
19 #include <sys/syscall.h>
20 #endif
21 #ifdef HAVE_SYS_PTRACE_H
22 #include <sys/ptrace.h>
23 #endif
25 /* The syscall package calls C functions. The Go compiler can not
26 represent a C varargs functions. On some systems it's important
27 that the declaration of a function match the call. This function
28 holds non-varargs C functions that the Go code can call. */
30 int
31 __go_open (char *path, int mode, mode_t perm)
33 return open (path, mode, perm);
36 int
37 __go_fcntl (int fd, int cmd, int arg)
39 return fcntl (fd, cmd, arg);
42 int
43 __go_fcntl_flock (int fd, int cmd, struct flock *arg)
45 return fcntl (fd, cmd, arg);
48 // This is for the net package. We use uintptr_t to make sure that
49 // the types match, since the Go and C "int" types are not the same.
50 struct go_fcntl_ret {
51 uintptr_t r;
52 uintptr_t err;
55 struct go_fcntl_ret
56 __go_fcntl_uintptr (uintptr_t fd, uintptr_t cmd, uintptr_t arg)
58 int r;
59 struct go_fcntl_ret ret;
61 r = fcntl ((int) fd, (int) cmd, (int) arg);
62 ret.r = (uintptr_t) r;
63 if (r < 0)
64 ret.err = (uintptr_t) errno;
65 else
66 ret.err = 0;
67 return ret;
70 int
71 __go_ioctl (int d, int request, int arg)
73 return ioctl (d, request, arg);
76 int
77 __go_ioctl_ptr (int d, int request, void *arg)
79 return ioctl (d, request, arg);
82 #ifdef HAVE_OPEN64
84 int
85 __go_open64 (char *path, int mode, mode_t perm)
87 return open64 (path, mode, perm);
90 #endif
92 #ifdef HAVE_OPENAT
94 int
95 __go_openat (int fd, char *path, int flags, mode_t mode)
97 return openat (fd, path, flags, mode);
100 #endif
102 #ifdef HAVE_SYSCALL
104 // __go_syscall6 is called by both the runtime and syscall packages.
105 // We use uintptr_t to make sure that the types match, since the Go
106 // and C "int" types are not the same.
108 uintptr_t
109 __go_syscall6(uintptr_t flag, uintptr_t a1, uintptr_t a2, uintptr_t a3,
110 uintptr_t a4, uintptr_t a5, uintptr_t a6)
112 return syscall (flag, a1, a2, a3, a4, a5, a6);
115 #endif
118 #if defined(HAVE_SYS_PTRACE_H) && defined(__linux__)
120 // Despite documented appearances, this is actually implemented as
121 // a variadic function within glibc on Linux.
123 long
124 __go_ptrace(int request, pid_t pid, void *addr, void *data)
126 return ptrace (request, pid, addr, data);
129 #endif