mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-08-28 19:41:16 +00:00
368 lines
13 KiB
C
368 lines
13 KiB
C
/*
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* internal.h: internal definitions just used by code from the library
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*/
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#ifndef __VIR_INTERNAL_H__
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# define __VIR_INTERNAL_H__
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# include <errno.h>
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# include <limits.h>
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# include <verify.h>
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# include <stdbool.h>
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# include <stdint.h>
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# if STATIC_ANALYSIS
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# undef NDEBUG /* Don't let a prior NDEBUG definition cause trouble. */
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# include <assert.h>
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# define sa_assert(expr) assert (expr)
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# else
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# define sa_assert(expr) /* empty */
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# endif
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/* The library itself is allowed to use deprecated functions /
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* variables, so effectively undefine the deprecated attribute
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* which would otherwise be defined in libvirt.h.
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*/
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# undef VIR_DEPRECATED
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# define VIR_DEPRECATED /*empty*/
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/* The library itself needs to know enum sizes. */
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# define VIR_ENUM_SENTINELS
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/* All uses of _() within the library should pick up translations from
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* libvirt's message files, rather than from the package that is
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* linking in the library. Setting this macro before including
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* "gettext.h" means that gettext() (and _()) will properly expand to
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* dgettext. */
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# define DEFAULT_TEXT_DOMAIN PACKAGE
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# include "gettext.h"
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# define _(str) gettext(str)
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# define N_(str) str
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# include "libvirt/libvirt.h"
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# include "libvirt/libvirt-qemu.h"
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# include "libvirt/virterror.h"
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# include "libvirt_internal.h"
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# include "c-strcase.h"
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# include "ignore-value.h"
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/* On architectures which lack these limits, define them (ie. Cygwin).
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* Note that the libvirt code should be robust enough to handle the
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* case where actual value is longer than these limits (eg. by setting
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* length correctly in second argument to gethostname and by always
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* using strncpy instead of strcpy).
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*/
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# ifndef HOST_NAME_MAX
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# define HOST_NAME_MAX 256
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# endif
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# ifndef INET_ADDRSTRLEN
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# define INET_ADDRSTRLEN 16
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# endif
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/* String equality tests, suggested by Jim Meyering. */
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# define STREQ(a,b) (strcmp(a,b) == 0)
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# define STRCASEEQ(a,b) (c_strcasecmp(a,b) == 0)
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# define STRNEQ(a,b) (strcmp(a,b) != 0)
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# define STRCASENEQ(a,b) (c_strcasecmp(a,b) != 0)
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# define STREQLEN(a,b,n) (strncmp(a,b,n) == 0)
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# define STRCASEEQLEN(a,b,n) (c_strncasecmp(a,b,n) == 0)
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# define STRNEQLEN(a,b,n) (strncmp(a,b,n) != 0)
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# define STRCASENEQLEN(a,b,n) (c_strncasecmp(a,b,n) != 0)
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# define STRPREFIX(a,b) (strncmp(a,b,strlen(b)) == 0)
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# define STRSKIP(a,b) (STRPREFIX(a,b) ? (a) + strlen(b) : NULL)
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# define STREQ_NULLABLE(a, b) \
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((a) ? (b) && STREQ((a) ? (a) : "", (b) ? (b) : "") : !(b))
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# define STRNEQ_NULLABLE(a, b) \
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((a) ? !(b) || STRNEQ((a) ? (a) : "", (b) ? (b) : "") : !!(b))
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# define NUL_TERMINATE(buf) do { (buf)[sizeof(buf)-1] = '\0'; } while (0)
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# define ARRAY_CARDINALITY(Array) (sizeof(Array) / sizeof(*(Array)))
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/* C99 uses __func__. __FUNCTION__ is legacy. */
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# ifndef __GNUC__
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# define __FUNCTION__ __func__
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# endif
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# ifdef __GNUC__
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# ifndef __GNUC_PREREQ
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# if defined __GNUC__ && defined __GNUC_MINOR__
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# define __GNUC_PREREQ(maj, min) \
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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# else
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# define __GNUC_PREREQ(maj,min) 0
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# endif
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/* Work around broken limits.h on debian etch */
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# if defined _GCC_LIMITS_H_ && ! defined ULLONG_MAX
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# define ULLONG_MAX ULONG_LONG_MAX
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# endif
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# endif /* __GNUC__ */
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/**
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* ATTRIBUTE_UNUSED:
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*
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* Macro to flag consciously unused parameters to functions
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*/
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# ifndef ATTRIBUTE_UNUSED
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# define ATTRIBUTE_UNUSED __attribute__((__unused__))
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# endif
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/**
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* ATTRIBUTE_NORETURN:
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*
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* Macro to indicate that a function won't return to the caller
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*/
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# ifndef ATTRIBUTE_NORETURN
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# define ATTRIBUTE_NORETURN __attribute__((__noreturn__))
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# endif
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/**
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* ATTRIBUTE_SENTINEL:
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*
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* Macro to check for NULL-terminated varargs lists
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*/
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# ifndef ATTRIBUTE_SENTINEL
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# if __GNUC_PREREQ (4, 0)
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# define ATTRIBUTE_SENTINEL __attribute__((__sentinel__))
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# else
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# define ATTRIBUTE_SENTINEL
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# endif
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# endif
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/**
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* ATTRIBUTE_FMT_PRINTF
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*
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* Macro used to check printf like functions, if compiling
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* with gcc.
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*
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* We use gnulib which guarantees we always have GNU style
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* printf format specifiers even on broken Win32 platforms
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* hence we have to force 'gnu_printf' for new GCC
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*/
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# ifndef ATTRIBUTE_FMT_PRINTF
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# if __GNUC_PREREQ (4, 4)
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# define ATTRIBUTE_FMT_PRINTF(fmtpos,argpos) \
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__attribute__((__format__ (__gnu_printf__, fmtpos, argpos)))
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# else
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# define ATTRIBUTE_FMT_PRINTF(fmtpos,argpos) \
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__attribute__((__format__ (__printf__, fmtpos, argpos)))
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# endif
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# endif
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# ifndef ATTRIBUTE_RETURN_CHECK
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# if __GNUC_PREREQ (3, 4)
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# define ATTRIBUTE_RETURN_CHECK __attribute__((__warn_unused_result__))
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# else
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# define ATTRIBUTE_RETURN_CHECK
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# endif
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# endif
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/**
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* ATTRIBUTE_PACKED
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*
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* force a structure to be packed, i.e. not following architecture and
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* compiler best alignments for its sub components. It's needed for example
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* for the network filetering code when defining the content of raw
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* ethernet packets.
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* Others compiler than gcc may use something different e.g. #pragma pack(1)
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*/
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# ifndef ATTRIBUTE_PACKED
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# if __GNUC_PREREQ (3, 3)
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# define ATTRIBUTE_PACKED __attribute__((packed))
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# else
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# error "Need an __attribute__((packed)) equivalent"
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# endif
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# endif
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# ifndef ATTRIBUTE_NONNULL
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# if __GNUC_PREREQ (3, 3) && STATIC_ANALYSIS
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# define ATTRIBUTE_NONNULL(m) __attribute__((__nonnull__(m)))
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# else
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# define ATTRIBUTE_NONNULL(m)
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# endif
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# endif
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# else
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# ifndef ATTRIBUTE_UNUSED
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# define ATTRIBUTE_UNUSED
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# endif
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# ifndef ATTRIBUTE_FMT_PRINTF
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# define ATTRIBUTE_FMT_PRINTF(...)
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# endif
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# ifndef ATTRIBUTE_RETURN_CHECK
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# define ATTRIBUTE_RETURN_CHECK
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# endif
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# endif /* __GNUC__ */
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/*
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* Use this when passing possibly-NULL strings to printf-a-likes.
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*/
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# define NULLSTR(s) ((s) ? (s) : "(null)")
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/**
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* TODO:
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*
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* macro to flag unimplemented blocks
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*/
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# define TODO \
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fprintf(stderr, "Unimplemented block at %s:%d\n", \
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__FILE__, __LINE__);
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/**
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* virCheckFlags:
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* @supported: an OR'ed set of supported flags
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* @retval: return value in case unsupported flags were passed
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*
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* To avoid memory leaks this macro has to be used before any non-trivial
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* code which could possibly allocate some memory.
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*
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* Returns nothing. Exits the caller function if unsupported flags were
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* passed to it.
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*/
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# define virCheckFlags(supported, retval) \
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do { \
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unsigned long __unsuppflags = flags & ~(supported); \
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if (__unsuppflags) { \
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virReportInvalidArg(flags, \
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_("unsupported flags (0x%lx) in function %s"), \
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__unsuppflags, __FUNCTION__); \
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return retval; \
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} \
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} while (0)
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# define virCheckNonNullArgReturn(argname, retval) \
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do { \
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if (argname == NULL) { \
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virReportInvalidNonNullArg(argname); \
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return retval; \
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} \
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} while (0)
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# define virCheckNullArgGoto(argname, label) \
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do { \
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if (argname != NULL) { \
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virReportInvalidNullArg(argname); \
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goto label; \
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} \
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} while (0)
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# define virCheckNonNullArgGoto(argname, label) \
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do { \
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if (argname == NULL) { \
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virReportInvalidNonNullArg(argname); \
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goto label; \
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} \
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} while (0)
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# define virCheckPositiveArgGoto(argname, label) \
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do { \
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if (argname <= 0) { \
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virReportInvalidPositiveArg(argname); \
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goto label; \
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} \
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} while (0)
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# define virCheckNonZeroArgGoto(argname, label) \
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do { \
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if (argname == 0) { \
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virReportInvalidNonZeroArg(argname); \
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goto label; \
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} \
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} while (0)
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# define virCheckZeroArgGoto(argname, label) \
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do { \
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if (argname != 0) { \
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virReportInvalidNonZeroArg(argname); \
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goto label; \
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} \
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} while (0)
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# define virCheckNonNegativeArgGoto(argname, label) \
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do { \
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if (argname < 0) { \
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virReportInvalidNonNegativeArg(argname); \
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goto label; \
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} \
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} while (0)
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/* divide value by size, rounding up */
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# define VIR_DIV_UP(value, size) (((value) + (size) - 1) / (size))
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# if WITH_DTRACE_PROBES
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# ifndef LIBVIRT_PROBES_H
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# define LIBVIRT_PROBES_H
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# include "libvirt_probes.h"
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# endif /* LIBVIRT_PROBES_H */
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/* Systemtap 1.2 headers have a bug where they cannot handle a
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* variable declared with array type. Work around this by casting all
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* arguments. This is some gross use of the preprocessor because
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* PROBE is a var-arg macro, but it is better than the alternative of
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* making all callers to PROBE have to be aware of the issues. And
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* hopefully, if we ever add a call to PROBE with other than 9
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* end arguments, you can figure out the pattern to extend this hack.
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*/
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# define VIR_COUNT_ARGS(...) VIR_ARG11(__VA_ARGS__, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
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# define VIR_ARG11(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, ...) _11
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# define VIR_ADD_CAST_EXPAND(a, b, ...) VIR_ADD_CAST_PASTE(a, b, __VA_ARGS__)
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# define VIR_ADD_CAST_PASTE(a, b, ...) a##b(__VA_ARGS__)
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/* The double cast is necessary to silence gcc warnings; any pointer
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* can safely go to intptr_t and back to void *, which collapses
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* arrays into pointers; while any integer can be widened to intptr_t
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* then cast to void *. */
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# define VIR_ADD_CAST(a) ((void *)(intptr_t)(a))
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# define VIR_ADD_CAST1(a) \
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VIR_ADD_CAST(a)
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# define VIR_ADD_CAST2(a, b) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b)
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# define VIR_ADD_CAST3(a, b, c) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c)
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# define VIR_ADD_CAST4(a, b, c, d) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d)
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# define VIR_ADD_CAST5(a, b, c, d, e) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e)
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# define VIR_ADD_CAST6(a, b, c, d, e, f) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f)
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# define VIR_ADD_CAST7(a, b, c, d, e, f, g) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
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VIR_ADD_CAST(g)
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# define VIR_ADD_CAST8(a, b, c, d, e, f, g, h) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
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VIR_ADD_CAST(g), VIR_ADD_CAST(h)
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# define VIR_ADD_CAST9(a, b, c, d, e, f, g, h, i) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
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VIR_ADD_CAST(g), VIR_ADD_CAST(h), VIR_ADD_CAST(i)
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# define VIR_ADD_CASTS(...) \
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VIR_ADD_CAST_EXPAND(VIR_ADD_CAST, VIR_COUNT_ARGS(__VA_ARGS__), \
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__VA_ARGS__)
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# define PROBE_EXPAND(NAME, ARGS) NAME(ARGS)
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# define PROBE(NAME, FMT, ...) \
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VIR_DEBUG_INT(VIR_LOG_FROM_TRACE, \
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__FILE__, __LINE__, __func__, \
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#NAME ": " FMT, __VA_ARGS__); \
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if (LIBVIRT_ ## NAME ## _ENABLED()) { \
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PROBE_EXPAND(LIBVIRT_ ## NAME, \
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VIR_ADD_CASTS(__VA_ARGS__)); \
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}
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# else
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# define PROBE(NAME, FMT, ...) \
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VIR_DEBUG_INT(VIR_LOG_FROM_TRACE, \
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__FILE__, __LINE__, __func__, \
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#NAME ": " FMT, __VA_ARGS__);
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# endif
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#endif /* __VIR_INTERNAL_H__ */
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