1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
*
* Copyright (C) 2014,2015 Colin Walters <walters@verbum.org>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#pragma once
#include <glnx-backport-autocleanups.h>
#include <errno.h>
G_BEGIN_DECLS
gboolean glnx_throw (GError **error, const char *fmt, ...) G_GNUC_PRINTF (2,3);
/* Like `glnx_throw ()`, but returns %NULL. */
#define glnx_null_throw(error, args...) \
({glnx_throw (error, args); NULL;})
/* Implementation detail of glnx_throw_prefix() */
void glnx_real_set_prefix_error_va (GError *error,
const char *format,
va_list args) G_GNUC_PRINTF (2,0);
gboolean glnx_prefix_error (GError **error, const char *fmt, ...) G_GNUC_PRINTF (2,3);
/* Like `glnx_prefix_error ()`, but returns %NULL. */
#define glnx_prefix_error_null(error, args...) \
({glnx_prefix_error (error, args); NULL;})
/**
* GLNX_AUTO_PREFIX_ERROR:
*
* An autocleanup-based macro to automatically call `g_prefix_error()` (also with a colon+space `: `)
* when it goes out of scope. This is useful when one wants error strings built up by the callee
* function, not all callers.
*
* ```
* gboolean start_http_request (..., GError **error)
* {
* GLNX_AUTO_PREFIX_ERROR ("HTTP request", error)
*
* if (!libhttp_request_start (..., error))
* return FALSE;
* ...
* return TRUE;
* ```
*/
typedef struct {
const char *prefix;
GError **error;
} GLnxAutoErrorPrefix;
static inline void
glnx_cleanup_auto_prefix_error (GLnxAutoErrorPrefix *prefix)
{
if (prefix->error && *(prefix->error))
g_prefix_error (prefix->error, "%s: ", prefix->prefix);
}
G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC(GLnxAutoErrorPrefix, glnx_cleanup_auto_prefix_error)
#define GLNX_AUTO_PREFIX_ERROR(text, error) \
G_GNUC_UNUSED g_auto(GLnxAutoErrorPrefix) _GLNX_MAKE_ANONYMOUS(_glnxautoprefixerror_) = { text, error }
/* Set @error using the value of `g_strerror (errno)`.
*
* This function returns %FALSE so it can be used conveniently in a single
* statement:
*
* ```
* if (unlinkat (fd, somepathname) < 0)
* return glnx_throw_errno (error);
* ```
*/
static inline gboolean
glnx_throw_errno (GError **error)
{
/* Save the value of errno, in case one of the
* intermediate function calls happens to set it.
*/
int errsv = errno;
g_set_error_literal (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
g_strerror (errsv));
/* We also restore the value of errno, since that's
* what was done in a long-ago libgsystem commit
* https://git.gnome.org/browse/libgsystem/commit/?id=ed106741f7a0596dc8b960b31fdae671d31d666d
* but I certainly can't remember now why I did that.
*/
errno = errsv;
return FALSE;
}
/* Like glnx_throw_errno(), but yields a NULL pointer. */
#define glnx_null_throw_errno(error) \
({glnx_throw_errno (error); NULL;})
/* Implementation detail of glnx_throw_errno_prefix() */
void glnx_real_set_prefix_error_from_errno_va (GError **error,
gint errsv,
const char *format,
va_list args) G_GNUC_PRINTF (3,0);
gboolean glnx_throw_errno_prefix (GError **error, const char *fmt, ...) G_GNUC_PRINTF (2,3);
/* Like glnx_throw_errno_prefix(), but yields a NULL pointer. */
#define glnx_null_throw_errno_prefix(error, args...) \
({glnx_throw_errno_prefix (error, args); NULL;})
/* BEGIN LEGACY APIS */
#define glnx_set_error_from_errno(error) \
do { \
glnx_throw_errno (error); \
} while (0);
#define glnx_set_prefix_error_from_errno(error, format, args...) \
do { \
glnx_throw_errno_prefix (error, format, args); \
} while (0);
G_END_DECLS
|
