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libvirt/src/internal.h
Daniel P. Berrange 87fa184910 Conditionalize use of -Wno-suggest-attribute=format pragma 
Many GCC versions don't understand -Wno-suggest-attribute=format
so the pragma must only be used when supported
2015-01-16 17:12:27 +00:00

412 lines
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/*
* internal.h: internal definitions just used by code from the library
*
* Copyright (C) 2006-2014 Red Hat, Inc.
*
* 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 2.1 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, see
* <http://www.gnu.org/licenses/>.
*/
#ifndef __VIR_INTERNAL_H__
# define __VIR_INTERNAL_H__
# include <errno.h>
# include <limits.h>
# include <verify.h>
# include <stdbool.h>
# include <stdint.h>
# if STATIC_ANALYSIS
# undef NDEBUG /* Don't let a prior NDEBUG definition cause trouble. */
# include <assert.h>
# define sa_assert(expr) assert (expr)
# else
# define sa_assert(expr) /* empty */
# endif
/* The library itself is allowed to use deprecated functions /
* variables, so effectively undefine the deprecated attribute
* which would otherwise be defined in libvirt.h.
*/
# undef VIR_DEPRECATED
# define VIR_DEPRECATED /*empty*/
/* The library itself needs to know enum sizes. */
# define VIR_ENUM_SENTINELS
/* All uses of _() within the library should pick up translations from
* libvirt's message files, rather than from the package that is
* linking in the library. Setting this macro before including
* "gettext.h" means that gettext() (and _()) will properly expand to
* dgettext. */
# define DEFAULT_TEXT_DOMAIN PACKAGE
# include "gettext.h"
# define _(str) gettext(str)
# define N_(str) str
# include "libvirt/libvirt.h"
# include "libvirt/libvirt-lxc.h"
# include "libvirt/libvirt-qemu.h"
# include "libvirt/virterror.h"
# include "c-strcase.h"
# include "ignore-value.h"
# include "count-leading-zeros.h"
/* On architectures which lack these limits, define them (ie. Cygwin).
* Note that the libvirt code should be robust enough to handle the
* case where actual value is longer than these limits (eg. by setting
* length correctly in second argument to gethostname and by always
* using strncpy instead of strcpy).
*/
# ifndef HOST_NAME_MAX
# define HOST_NAME_MAX 256
# endif
# ifndef INET_ADDRSTRLEN
# define INET_ADDRSTRLEN 16
# endif
/* String equality tests, suggested by Jim Meyering. */
# define STREQ(a, b) (strcmp(a, b) == 0)
# define STRCASEEQ(a, b) (c_strcasecmp(a, b) == 0)
# define STRNEQ(a, b) (strcmp(a, b) != 0)
# define STRCASENEQ(a, b) (c_strcasecmp(a, b) != 0)
# define STREQLEN(a, b, n) (strncmp(a, b, n) == 0)
# define STRCASEEQLEN(a, b, n) (c_strncasecmp(a, b, n) == 0)
# define STRNEQLEN(a, b, n) (strncmp(a, b, n) != 0)
# define STRCASENEQLEN(a, b, n) (c_strncasecmp(a, b, n) != 0)
# define STRPREFIX(a, b) (strncmp(a, b, strlen(b)) == 0)
# define STRSKIP(a, b) (STRPREFIX(a, b) ? (a) + strlen(b) : NULL)
# define STREQ_NULLABLE(a, b) \
((a) ? (b) && STREQ((a) ? (a) : "", (b) ? (b) : "") : !(b))
# define STRNEQ_NULLABLE(a, b) \
((a) ? !(b) || STRNEQ((a) ? (a) : "", (b) ? (b) : "") : !!(b))
# define NUL_TERMINATE(buf) do { (buf)[sizeof(buf)-1] = '\0'; } while (0)
# define ARRAY_CARDINALITY(Array) (sizeof(Array) / sizeof(*(Array)))
/* C99 uses __func__. __FUNCTION__ is legacy. */
# ifndef __GNUC__
# define __FUNCTION__ __func__
# endif
# ifdef __GNUC__
# ifndef __GNUC_PREREQ
# if defined __GNUC__ && defined __GNUC_MINOR__
# define __GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
# else
# define __GNUC_PREREQ(maj, min) 0
# endif
/* Work around broken limits.h on debian etch */
# if defined _GCC_LIMITS_H_ && ! defined ULLONG_MAX
# define ULLONG_MAX ULONG_LONG_MAX
# endif
# endif /* __GNUC__ */
/**
* ATTRIBUTE_UNUSED:
*
* Macro to flag consciously unused parameters to functions
*/
# ifndef ATTRIBUTE_UNUSED
# define ATTRIBUTE_UNUSED __attribute__((__unused__))
# endif
/**
* ATTRIBUTE_NORETURN:
*
* Macro to indicate that a function won't return to the caller
*/
# ifndef ATTRIBUTE_NORETURN
# define ATTRIBUTE_NORETURN __attribute__((__noreturn__))
# endif
/**
* ATTRIBUTE_SENTINEL:
*
* Macro to check for NULL-terminated varargs lists
*/
# ifndef ATTRIBUTE_SENTINEL
# if __GNUC_PREREQ (4, 0)
# define ATTRIBUTE_SENTINEL __attribute__((__sentinel__))
# else
# define ATTRIBUTE_SENTINEL
# endif
# endif
/**
* ATTRIBUTE_FMT_PRINTF
*
* Macro used to check printf like functions, if compiling
* with gcc.
*
* We use gnulib which guarantees we always have GNU style
* printf format specifiers even on broken Win32 platforms
* hence we have to force 'gnu_printf' for new GCC
*/
# ifndef ATTRIBUTE_FMT_PRINTF
# if __GNUC_PREREQ (4, 4)
# define ATTRIBUTE_FMT_PRINTF(fmtpos, argpos) \
__attribute__((__format__ (__gnu_printf__, fmtpos, argpos)))
# else
# define ATTRIBUTE_FMT_PRINTF(fmtpos, argpos) \
__attribute__((__format__ (__printf__, fmtpos, argpos)))
# endif
# endif
# ifndef ATTRIBUTE_RETURN_CHECK
# if __GNUC_PREREQ (3, 4)
# define ATTRIBUTE_RETURN_CHECK __attribute__((__warn_unused_result__))
# else
# define ATTRIBUTE_RETURN_CHECK
# endif
# endif
/**
* ATTRIBUTE_PACKED
*
* force a structure to be packed, i.e. not following architecture and
* compiler best alignments for its sub components. It's needed for example
* for the network filetering code when defining the content of raw
* ethernet packets.
* Others compiler than gcc may use something different e.g. #pragma pack(1)
*/
# ifndef ATTRIBUTE_PACKED
# if __GNUC_PREREQ (3, 3)
# define ATTRIBUTE_PACKED __attribute__((packed))
# else
# error "Need an __attribute__((packed)) equivalent"
# endif
# endif
/* gcc's handling of attribute nonnull is less than stellar - it does
* NOT improve diagnostics, and merely allows gcc to optimize away
* null code checks even when the caller manages to pass null in spite
* of the attribute, leading to weird crashes. Coverity, on the other
* hand, knows how to do better static analysis based on knowing
* whether a parameter is nonnull. Make this attribute conditional
* based on whether we are compiling for real or for analysis, while
* still requiring correct gcc syntax when it is turned off. See also
* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17308 */
# ifndef ATTRIBUTE_NONNULL
# if __GNUC_PREREQ (3, 3)
# if STATIC_ANALYSIS
# define ATTRIBUTE_NONNULL(m) __attribute__((__nonnull__(m)))
# else
# define ATTRIBUTE_NONNULL(m) __attribute__(())
# endif
# else
# define ATTRIBUTE_NONNULL(m)
# endif
# endif
# else
# ifndef ATTRIBUTE_UNUSED
# define ATTRIBUTE_UNUSED
# endif
# ifndef ATTRIBUTE_FMT_PRINTF
# define ATTRIBUTE_FMT_PRINTF(...)
# endif
# ifndef ATTRIBUTE_RETURN_CHECK
# define ATTRIBUTE_RETURN_CHECK
# endif
# endif /* __GNUC__ */
# if WORKING_PRAGMA_PUSH
# define VIR_WARNINGS_NO_CAST_ALIGN \
_Pragma ("GCC diagnostic push") \
_Pragma ("GCC diagnostic ignored \"-Wcast-align\"")
# if HAVE_SUGGEST_ATTRIBUTE_FORMAT
# define VIR_WARNINGS_NO_PRINTF \
_Pragma ("GCC diagnostic push") \
_Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=format\"")
# else
# define VIR_WARNINGS_NO_PRINTF \
_Pragma ("GCC diagnostic push")
# endif
# define VIR_WARNINGS_RESET \
_Pragma ("GCC diagnostic pop")
# else
# define VIR_WARNINGS_NO_CAST_ALIGN
# define VIR_WARNINGS_NO_PRINTF
# define VIR_WARNINGS_RESET
# endif
/*
* Use this when passing possibly-NULL strings to printf-a-likes.
*/
# define NULLSTR(s) ((s) ? (s) : "<null>")
/*
* Similar to NULLSTR, but print '-' to make it more user friendly.
*/
# define EMPTYSTR(s) ((s) ? (s) : "-")
/**
* TODO:
*
* macro to flag unimplemented blocks
*/
# define TODO \
fprintf(stderr, "Unimplemented block at %s:%d\n", \
__FILE__, __LINE__);
/**
* SWAP:
*
* In place exchange of two values
*/
# define SWAP(a, b) \
do { \
(a) = (a) ^ (b); \
(b) = (a) ^ (b); \
(a) = (a) ^ (b); \
} while (0)
/**
* virCheckFlags:
* @supported: an OR'ed set of supported flags
* @retval: return value in case unsupported flags were passed
*
* To avoid memory leaks this macro has to be used before any non-trivial
* code which could possibly allocate some memory.
*
* Returns nothing. Exits the caller function if unsupported flags were
* passed to it.
*/
# define virCheckFlags(supported, retval) \
do { \
unsigned long __unsuppflags = flags & ~(supported); \
if (__unsuppflags) { \
virReportInvalidArg(flags, \
_("unsupported flags (0x%lx) in function %s"), \
__unsuppflags, __FUNCTION__); \
return retval; \
} \
} while (0)
/**
* virCheckFlagsGoto:
* @supported: an OR'ed set of supported flags
* @label: label to jump to on error
*
* To avoid memory leaks this macro has to be used before any non-trivial
* code which could possibly allocate some memory.
*
* Returns nothing. Jumps to a label if unsupported flags were
* passed to it.
*/
# define virCheckFlagsGoto(supported, label) \
do { \
unsigned long __unsuppflags = flags & ~(supported); \
if (__unsuppflags) { \
virReportInvalidArg(flags, \
_("unsupported flags (0x%lx) in function %s"), \
__unsuppflags, __FUNCTION__); \
goto label; \
} \
} while (0)
# define virCheckNonNullArgReturn(argname, retval) \
do { \
if (argname == NULL) { \
virReportInvalidNonNullArg(argname); \
return retval; \
} \
} while (0)
# define virCheckNullArgGoto(argname, label) \
do { \
if (argname != NULL) { \
virReportInvalidNullArg(argname); \
goto label; \
} \
} while (0)
# define virCheckNonNullArgGoto(argname, label) \
do { \
if (argname == NULL) { \
virReportInvalidNonNullArg(argname); \
goto label; \
} \
} while (0)
# define virCheckPositiveArgGoto(argname, label) \
do { \
if (argname <= 0) { \
virReportInvalidPositiveArg(argname); \
goto label; \
} \
} while (0)
# define virCheckNonZeroArgGoto(argname, label) \
do { \
if (argname == 0) { \
virReportInvalidNonZeroArg(argname); \
goto label; \
} \
} while (0)
# define virCheckZeroArgGoto(argname, label) \
do { \
if (argname != 0) { \
virReportInvalidNonZeroArg(argname); \
goto label; \
} \
} while (0)
# define virCheckNonNegativeArgGoto(argname, label) \
do { \
if (argname < 0) { \
virReportInvalidNonNegativeArg(argname); \
goto label; \
} \
} while (0)
# define virCheckReadOnlyGoto(flags, label) \
do { \
if ((flags) & VIR_CONNECT_RO) { \
virReportRestrictedError(_("read only access prevents %s"), \
__FUNCTION__); \
goto label; \
} \
} while (0)
/* divide value by size, rounding up */
# define VIR_DIV_UP(value, size) (((value) + (size) - 1) / (size))
/* round up value to the closest multiple of size */
# define VIR_ROUND_UP(value, size) (VIR_DIV_UP(value, size) * (size))
/* Round up to the next closest power of 2. It will return rounded number or 0
* for 0 or number more than 2^31 (for 32bit unsigned int). */
# define VIR_ROUND_UP_POWER_OF_TWO(value) \
((value) > 0 && (value) <= 1U << (sizeof(unsigned int) * 8 - 1) ? \
1U << (sizeof(unsigned int) * 8 - count_leading_zeros((value) - 1)) : 0)
/* Specific error values for use in forwarding programs such as
* virt-login-shell; these values match what GNU env does. */
enum {
EXIT_CANCELED = 125, /* Failed before attempting exec */
EXIT_CANNOT_INVOKE = 126, /* Exists but couldn't exec */
EXIT_ENOENT = 127, /* Could not find program to exec */
};
#endif /* __VIR_INTERNAL_H__ */
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