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efence.h File Reference

#include <sys/types.h>


Defines
#define	C_LINKAGE
Functions
void	Page_AllowAccess (void *address, size_t size)
void *	Page_Create (size_t size)
void	Page_Delete (void *address, size_t size)
void	Page_DenyAccess (void *address, size_t size)
size_t	Page_Size (void)
void	EF_Abort (const char *message,...)
void	EF_Exit (const char *message,...)
void	EF_Print (const char *message,...)

Define Documentation

#define C_LINKAGE

Definition at line 13 of file efence.h.

Function Documentation

void EF_Abort	(	const char *	message,
		...
	)

Definition at line 1045 of file efence.c.

References args, EF_Print(), getpid(), and vprint().

Referenced by free(), internalError(), memalign(), printNumber(), and realloc().

01046 {
01047         va_list args;
01048 
01049         va_start(args, pattern);
01050 
01051         EF_Print("\nElectricFence Aborting: ");
01052         vprint(pattern, args);
01053         EF_Print("\n");
01054 
01055         va_end(args);
01056 
01057         /*
01058          * I use kill(getpid(), SIGILL) instead of abort() because some
01059          * mis-guided implementations of abort() flush stdio, which can
01060          * cause malloc() or free() to be called.
01061          */
01062         kill(getpid(), SIGILL);
01063         /* Just in case something handles SIGILL and returns, exit here. */
01064         _exit(-1);
01065 }

void EF_Exit	(	const char *	message,
		...
	)

Definition at line 1068 of file efence.c.

References args, EF_Print(), and vprint().

Referenced by mprotectFailed(), Page_Create(), and Page_Delete().

01069 {
01070         va_list args;
01071 
01072         va_start(args, pattern);
01073 
01074         EF_Print("\nElectricFence Exiting: ");
01075         vprint(pattern, args);
01076         EF_Print("\n");
01077 
01078         va_end(args);
01079 
01080         /*
01081          * I use _exit() because the regular exit() flushes stdio,
01082          * which may cause malloc() or free() to be called.
01083          */
01084         _exit(-1);
01085 }

void EF_Print	(	const char *	message,
		...
	)

Definition at line 1088 of file efence.c.

References args, and vprint().

Referenced by EF_Abort(), EF_Exit(), initialize(), and vprint().

01089 {
01090         va_list args;
01091 
01092         va_start(args, pattern);
01093         vprint(pattern, args);
01094         va_end(args);
01095 }

void Page_AllowAccess	(	void *	address,
		size_t	size
	)

Definition at line 888 of file efence.c.

References mprotectFailed().

Referenced by allocateMoreSlots(), free(), memalign(), and realloc().

00889 {
00890         if ( mprotect((caddr_t)address, size, PROT_READ|PROT_WRITE) < 0 )
00891                 mprotectFailed();
00892 }

void* Page_Create

(

size_t

size

)

Definition at line 841 of file efence.c.

References EF_Exit(), startAddr, and stringErrorReport().

Referenced by initialize(), and memalign().

00842 {
00843         static int      devZeroFd = -1;
00844         caddr_t         allocation;
00845 
00846         if ( devZeroFd == -1 ) {
00847                 devZeroFd = open("/dev/zero", O_RDWR);
00848                 if ( devZeroFd < 0 )
00849                         EF_Exit(
00850                          "open() on /dev/zero failed: %s"
00851                         ,stringErrorReport());
00852         }
00853 
00854         /*
00855          * In this version, "startAddr" is a _hint_, not a demand.
00856          * When the memory I map here is contiguous with other
00857          * mappings, the allocator can coalesce the memory from two
00858          * or more mappings into one large contiguous chunk, and thus
00859          * might be able to find a fit that would not otherwise have
00860          * been possible. I could _force_ it to be contiguous by using
00861          * the MMAP_FIXED flag, but I don't want to stomp on memory mappings
00862          * generated by other software, etc.
00863          */
00864         allocation = mmap(
00865          startAddr
00866         ,(int)size
00867         ,PROT_READ|PROT_WRITE
00868         ,MAP_PRIVATE
00869         ,devZeroFd
00870         ,0);
00871 
00872         startAddr = allocation + size;
00873 
00874         if ( allocation == (caddr_t)-1 )
00875                 EF_Exit("mmap() failed: %s", stringErrorReport());
00876 
00877         return (void *)allocation;
00878 }

void Page_Delete	(	void *	address,
		size_t	size
	)

Definition at line 902 of file efence.c.

References EF_Exit(), Page_DenyAccess(), and stringErrorReport().

Referenced by free(), and memalign().

00903 {
00904 /*
00905  * My SGI ONYX running IRIX 5.0 crashes reliably when "tstheap 3072" is
00906  * run with the munmap call below compiled in. I'd like to hear how well
00907  * other operating systems handle it, so that I can enable it on those
00908  * systems.
00909  */
00910 #if ( defined(_AIX) )
00911         if ( munmap((caddr_t)address, size) < 0 )
00912                 EF_Exit("munmap() failed: %s", stringErrorReport());
00913 #else
00914         Page_DenyAccess(address, size);
00915 #endif
00916 }

void Page_DenyAccess	(	void *	address,
		size_t	size
	)

Definition at line 895 of file efence.c.

References mprotectFailed().

Referenced by free(), initialize(), memalign(), Page_Delete(), and realloc().

00896 {
00897         if ( mprotect((caddr_t)address, size, PROT_NONE) < 0 )
00898                 mprotectFailed();
00899 }

size_t Page_Size

(

void

)

Definition at line 933 of file efence.c.

References getpagesize().

Referenced by initialize().

00934 {
00935         return getpagesize();
00936 }

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