libvirt/src/internal.h
Eric Blake d4982b86d2 build: drop unused <sys/syslimits.h> header
<sys/syslimits.h> is not standardized, so portable programs should
not need to rely on it.  If there really is something that we need
where <sys/syslimits.h> provided the limit but <limits.h> did not,
then that would be a candidate for fixing in gnulib.  But this patch
did not turn up any compilation failures on Linux.

* src/internal.h (includes): Drop unused header.
* daemon/libvirtd.h (includes): Likewise.
* configure.ac (AC_CHECK_HEADERS): Likewise.
Based on a report by Matthias Bolte.
2011-05-17 09:34:11 -06:00

246 lines
7.3 KiB
C

/*
* internal.h: internal definitions just used by code from the library
*/
#ifndef __VIR_INTERNAL_H__
# define __VIR_INTERNAL_H__
# include <errno.h>
# include <limits.h>
# include <verify.h>
# include <stdbool.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.
*/
# define VIR_DEPRECATED /*empty*/
/* 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-qemu.h"
# include "libvirt/virterror.h"
# include "libvirt_internal.h"
# include "c-strcase.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 IF_NAMESIZE
# define IF_NAMESIZE 16
# 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)) || ((a) && (b) && STREQ((a), (b))))
# define STRNEQ_NULLABLE(a, b) \
((!(a) ^ !(b)) || ((a) && (b) && STRNEQ((a), (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 conciously 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 guarentees 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
# ifndef ATTRIBUTE_NONNULL
# if __GNUC_PREREQ (3, 3)
# define ATTRIBUTE_NONNULL(m) __attribute__((__nonnull__(m)))
# 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__ */
/*
* Use this when passing possibly-NULL strings to printf-a-likes.
*/
# define NULLSTR(s) \
((void)verify_true(sizeof *(s) == sizeof (char)), \
(s) ? (s) : "(null)")
/**
* TODO:
*
* macro to flag unimplemented blocks
*/
# define TODO \
fprintf(stderr, "Unimplemented block at %s:%d\n", \
__FILE__, __LINE__);
/**
* 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) { \
virReportErrorHelper(VIR_FROM_THIS, \
VIR_ERR_INVALID_ARG, \
__FILE__, \
__FUNCTION__, \
__LINE__, \
_("%s: unsupported flags (0x%lx)"), \
__FUNCTION__, __unsuppflags); \
return retval; \
} \
} while (0)
/* divide value by size, rounding up */
# define VIR_DIV_UP(value, size) (((value) + (size) - 1) / (size))
#endif /* __VIR_INTERNAL_H__ */