1 /* go-varargs.c -- functions for calling C varargs functions.
2 
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.  */
6 
7 #include "config.h"
8 
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 
22 /* The syscall package calls C functions.  The Go compiler can not
23    represent a C varargs functions.  On some systems it's important
24    that the declaration of a function match the call.  This function
25    holds non-varargs C functions that the Go code can call.  */
26 
27 int
28 __go_open (char *path, int mode, mode_t perm)
29 {
30   return open (path, mode, perm);
31 }
32 
33 int
34 __go_fcntl (int fd, int cmd, int arg)
35 {
36   return fcntl (fd, cmd, arg);
37 }
38 
39 int
40 __go_fcntl_flock (int fd, int cmd, struct flock *arg)
41 {
42   return fcntl (fd, cmd, arg);
43 }
44 
45 // This is for the net package.  We use uintptr_t to make sure that
46 // the types match, since the Go and C "int" types are not the same.
47 struct go_fcntl_ret {
48   uintptr_t r;
49   uintptr_t err;
50 };
51 
52 struct go_fcntl_ret
53 __go_fcntl_uintptr (uintptr_t fd, uintptr_t cmd, uintptr_t arg)
54 {
55   int r;
56   struct go_fcntl_ret ret;
57 
58   r = fcntl ((int) fd, (int) cmd, (int) arg);
59   ret.r = (uintptr_t) r;
60   if (r < 0)
61     ret.err = (uintptr_t) errno;
62   else
63     ret.err = 0;
64   return ret;
65 }
66 
67 int
68 __go_ioctl (int d, int request, int arg)
69 {
70   return ioctl (d, request, arg);
71 }
72 
73 int
74 __go_ioctl_ptr (int d, int request, void *arg)
75 {
76   return ioctl (d, request, arg);
77 }
78 
79 #ifdef HAVE_OPEN64
80 
81 int
82 __go_open64 (char *path, int mode, mode_t perm)
83 {
84   return open64 (path, mode, perm);
85 }
86 
87 #endif
88 
89 #ifdef HAVE_OPENAT
90 
91 int
92 __go_openat (int fd, char *path, int flags, mode_t mode)
93 {
94   return openat (fd, path, flags, mode);
95 }
96 
97 #endif
98 
99 #ifdef HAVE_SYSCALL
100 
101 // __go_syscall6 is called by both the runtime and syscall packages.
102 // We use uintptr_t to make sure that the types match, since the Go
103 // and C "int" types are not the same.
104 
105 uintptr_t
106 __go_syscall6(uintptr_t flag, uintptr_t a1, uintptr_t a2, uintptr_t a3,
107 	      uintptr_t a4, uintptr_t a5, uintptr_t a6)
108 {
109   return syscall (flag, a1, a2, a3, a4, a5, a6);
110 }
111 
112 #endif
113