util/error.c

   1 /*
   2  * QEMU Error Objects
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU LGPL, version 2.  See
  10  * the COPYING.LIB file in the top-level directory.
  11  */
  12
  13 #include "qemu-common.h"
  14 #include "qapi/error.h"
  15 #include "qemu/error-report.h"
  16
  17 struct Error
  18 {
  19     char *msg;
  20     ErrorClass err_class;
  21 };
  22
  23 Error *error_abort;
  24
  25 void error_set(Error **errp, ErrorClass err_class, const char *fmt, ...)
  26 {
  27     Error *err;
  28     va_list ap;
  29     int saved_errno = errno;
  30
  31     if (errp == NULL) {
  32         return;
  33     }
  34     assert(*errp == NULL);
  35
  36     err = g_malloc0(sizeof(*err));
  37
  38     va_start(ap, fmt);
  39     err->msg = g_strdup_vprintf(fmt, ap);
  40     va_end(ap);
  41     err->err_class = err_class;
  42
  43     if (errp == &error_abort) {
  44         error_report("%s", error_get_pretty(err));
  45         abort();
  46     }
  47
  48     *errp = err;
  49
  50     errno = saved_errno;
  51 }
  52
  53 void error_set_errno(Error **errp, int os_errno, ErrorClass err_class,
  54                      const char *fmt, ...)
  55 {
  56     Error *err;
  57     char *msg1;
  58     va_list ap;
  59     int saved_errno = errno;
  60
  61     if (errp == NULL) {
  62         return;
  63     }
  64     assert(*errp == NULL);
  65
  66     err = g_malloc0(sizeof(*err));
  67
  68     va_start(ap, fmt);
  69     msg1 = g_strdup_vprintf(fmt, ap);
  70     if (os_errno != 0) {
  71         err->msg = g_strdup_printf("%s: %s", msg1, strerror(os_errno));
  72         g_free(msg1);
  73     } else {
  74         err->msg = msg1;
  75     }
  76     va_end(ap);
  77     err->err_class = err_class;
  78
  79     if (errp == &error_abort) {
  80         error_report("%s", error_get_pretty(err));
  81         abort();
  82     }
  83
  84     *errp = err;
  85
  86     errno = saved_errno;
  87 }
  88
  89 void error_setg_file_open(Error **errp, int os_errno, const char *filename)
  90 {
  91     error_setg_errno(errp, os_errno, "Could not open '%s'", filename);
  92 }
  93
  94 #ifdef _WIN32
  95
  96 void error_set_win32(Error **errp, int win32_err, ErrorClass err_class,
  97                      const char *fmt, ...)
  98 {
  99     Error *err;
 100     char *msg1;
 101     va_list ap;
 102
 103     if (errp == NULL) {
 104         return;
 105     }
 106     assert(*errp == NULL);
 107
 108     err = g_malloc0(sizeof(*err));
 109
 110     va_start(ap, fmt);
 111     msg1 = g_strdup_vprintf(fmt, ap);
 112     if (win32_err != 0) {
 113         char *msg2 = g_win32_error_message(win32_err);
 114         err->msg = g_strdup_printf("%s: %s (error: %x)", msg1, msg2,
 115                                    (unsigned)win32_err);
 116         g_free(msg2);
 117         g_free(msg1);
 118     } else {
 119         err->msg = msg1;
 120     }
 121     va_end(ap);
 122     err->err_class = err_class;
 123
 124     if (errp == &error_abort) {
 125         error_report("%s", error_get_pretty(err));
 126         abort();
 127     }
 128
 129     *errp = err;
 130 }
 131
 132 #endif
 133
 134 Error *error_copy(const Error *err)
 135 {
 136     Error *err_new;
 137
 138     err_new = g_malloc0(sizeof(*err));
 139     err_new->msg = g_strdup(err->msg);
 140     err_new->err_class = err->err_class;
 141
 142     return err_new;
 143 }
 144
 145 ErrorClass error_get_class(const Error *err)
 146 {
 147     return err->err_class;
 148 }
 149
 150 const char *error_get_pretty(Error *err)
 151 {
 152     return err->msg;
 153 }
 154
 155 void error_free(Error *err)
 156 {
 157     if (err) {
 158         g_free(err->msg);
 159         g_free(err);
 160     }
 161 }
 162
 163 void error_propagate(Error **dst_errp, Error *local_err)
 164 {
 165     if (local_err && dst_errp == &error_abort) {
 166         error_report("%s", error_get_pretty(local_err));
 167         abort();
 168     } else if (dst_errp && !*dst_errp) {
 169         *dst_errp = local_err;
 170     } else if (local_err) {
 171         error_free(local_err);
 172     }
 173 }