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Table 7.4

C(C89) Reentrant Library Function List

Standard Include File	Function Name	Reentrant	Standard Include File	Function Name	Reentrant
stddef.h	offsetof	O	math.h	frexp	D
assert.h	assert	X		ldexp	D
ctype.h	isalnum	O		log	D
	isalpha	O		log10	D
	iscntrl	O		modf	D
	isdigit	O		pow	D
	isgraph	O		sqrt	D *1
	islower	O		ceil	D
	isprint	O		fabs	D *1
	ispunct	O		floor	D
	isspace	O		fmod	D
	isupper	O	mathf.h	acosf	D
	isxdigit	O		asinf	D
	tolower	O		atanf	D
	toupper	O		atan2f	D *2
math.h	acos	D		cosf	D *2
	asin	D		sinf	D *2
	atan	D		tanf	D
	atan2	D *2		coshf	D
	cos	D *2		sinhf	D
	sin	D *2		tanhf	D
	tan	D		expf	D
	cosh	D		frexpf	D
	sinh	D		ldexpf	D
	tanh	D		logf	D
	exp	D		log10f	D
mathf.h	modff	D	stdio.h	fputs	X
	powf	D		getc	X
	sqrtf	D *1		getchar	X
	ceilf	D		gets	X
	fabsf	O		putc	X
	fabsl	D *1		putchar	X
	floorf	D		puts	X
	fmodf	D		ungetc	X
setjmp.h	setjmp	O		fread	X
setjmp.h	longjmp	O		fwrite	X
stdarg.h	va_start	O		fseek	X
	va_arg	O		ftell	X
	va_end	O		rewind	X
stdio.h	fclose	X		clearerr	X
	fflush	X		feof	X
	fopen	X		ferror	X
	freopen	X		perror	X
	setbuf	X	stdlib.h	atof	D
	setvbuf	X		atoi	D
	fprintf	X		atol	D
	fscanf	X		atoll	D
	printf	X		strtod	D
	scanf	X		strtol	D
	sprintf	X		strtoul	D
	sscanf	D		strtoll	D
	vfprintf	X		strtoull	D
	vprintf	X		rand	X
	vsprintf	X		srand	X
	fgetc	X		calloc	X
	fgets	X		free	X
	fputc	X		malloc	X
stdlib.h	realloc	X	string.h	strcmp	O
	bsearch	O		strncmp	O
	qsort	O		memchr	O
	abs	O		strchr	O
	div	O		strcspn	O
	labs	O		strpbrk	O
	llabs	O		strrchr	O
	ldiv	O		strspn	O
	lldiv	O		strstr	O
string.h	memcpy	O		strtok	X
	strcpy	O		memset	O
	strncpy	O		strerror	O
	strcat	O		strlen	O
	strncat	O		memmove	O
	memcmp	O		memmove	O

Notes 1.

If the function call is replaced by an instruction, the entry in the column for "Reentrant" in the table would become O (i.e. reentrance is possible) since the instruction does not update the errno variable. Refer to the item on -library in the section on compiler options for the conditions under which calls are replaced by instructions.

Notes 2.

If the function call is replaced by code that uses a trigonometric function unit, the entry in the column for "Reentrant" in the table might become X (i.e. non-reentrant). For details, refer to the item about -tfu in the section on compile options.

Table 7.5

C99 Reentrant Library Functions List

Standard Include File	Function Name	Reentrant	Standard Include File	Function Name	Reentrant
stddef.h	isblank	O	math.h	frexpl	D
math.h	acosl	D		ldexpl	D
	atanl	D		logl	D
	atan2l	D *2		log10l	D
	cosl	D *2		modfl	D
	sinl	D *2		powl	D
	tanl	D		sqrtl	D *1
	coshl	D		ceill	D
	sinhl	D		fabsl	D *1
	tanhl	D		floorl	D
	expl	D		fmodl	D
math.h	fpclassify	O	math.h	log2	X
	isfinite	O		log2f	X
	isinf	O		log2l	X
	isnan	O		logb	X
	isnormal	O		logbf	X
	signbit	O		logbl	X
	isgreater	O		scalbn	X
	isgreaterequal	O		scalbnf	X
	isless	O		scalbnl	X
	islessequal	O		scalbln	X
	islessgreater	O		scalblnf	X
	isunordered	O		scalblnl	X
	acosh	X		cbrt	O
	acoshf	X		cbrtf	O
	acoshl	X		cbrtl	O
	asinh	X		hypot	X
	asinhf	X		hypotf	X
	asinhl	X		hypotl	X
	atanh	X		erf	X
	atanhf	X		erff	X
	atanhl	X		erfl	X
	exp2	X		erfc	X
	exp2f	X		erfcf	X
	exp2l	X		erfcl	X
	expm1	D		lgamma	X
	expm1f	D		lgammaf	X
	expm1l	D		lgammal	X
	ilogb	O		tgamma	X
	ilogbf	O		tgammaf	X
	ilogbl	O		tgammal	X
	log1p	X		nearbyint	O
	log1pf	X		nearbyintf	O
	log1pl	X		nearbyintl	O
math.h	rint	X	math.h	nextafter	X
	rintf	X		nextafterf	X
	rintl	X		nextafterl	X
	lrint	X		nexttoward	X
	lrintf	X		nexttowardf	X
	lrintl	X		nexttowardl	X
	llrint	X		fdim	O
	llrintf	X		fdimf	O
	llrintl	X		fdiml	O
	round	O		fmax	O
	roundf	O		fmaxf	O
	roundl	O		fmaxl	O
	lround	X		fmin	O
	lroundf	X		fminf	O
	lroundl	X		fminl	O
	llround	X		fma	X
	llroundf	X		fmaf	X
	llroundl	X		fmal	X
	trunc	O	stdarg.h	va_copy	O
	truncf	O	stdio.h	snprintf	X
	truncl	O		vsnprintf	X
	remainder	X		vfscanf	X
	remainderf	X		vscanf	X
	remainderl	X		vsscanf	D
	remquo	X	complex.h	cacos	X
	remquof	X		cacosf	X
	remquol	X		cacosl	X
	copysign	O		casin	X
	copysignf	O		casinf	X
	copysignl	O		casinl	X
	nan	O		catan	X
	nanf	O		catanf	X
	nanl	O		catanl	X
complex.h	ccos	X	complex.h	cabsf	X
	ccosf	X		cabsl	X
	ccosl	X		cpow	X
	csin	X		cpowf	X
	csinf	X		cpowl	X
	csinl	X		csqrt	D
	ctan	D		csqrtf	D
	ctanf	D		csqrtl	D
	ctanl	D		carg	D
	cacosh	X		cargf	D
	cacoshf	X		cargl	D
	cacoshl	X		cimag	O
	casinh	X		cimagf	O
	casinhf	X		cimagl	O
	casinhl	X		conj	O
	catanh	X		conjf	O
	catanhf	X		conjl	O
	catanhl	X		cproj	O
	ccosh	X		cprojf	O
	ccoshf	X		cprojl	O
	ccoshl	X		creal	O
	csinh	X		crealf	O
	csinhf	X		creall	O
	csinhl	X	fenv.h	feclearexcept	X
	ctanh	D		fegetexceptflag	O
	ctanhf	D		feraiseexcept	X
	ctanhl	D		fesetexceptflag	X
	cexp	X		fetestexcept	O
	cexpf	X		fegetround	O
	cexpl	X		fesetround	X
	clog	X		fegetenv	O
	clogf	X		feholdexcept	X
	clogl	X		fesetenv	X
	cabs	X		feupdateenv	X
inttypes.h	imaxabs	O	wchar.h	wcstod	D
	imaxdiv	O		wcstof	D
	strtoimax	D		wcstold	D
	strtoumax	D		wcstol	D
	wcstoimax	D		wcstoll	D
	wcstoumax	D		wcstoul	D
wchar.h	fwprintf	X		wcstoull	D
	vfwprintf	X		wcscpy	O
	swprintf	X		wcsncpy	O
	vswprintf	X		wmemcpy	O
	wprintf	X		wmemmove	O
	vwprintf	X		wcscat	O
	fwscanf	X		wcsncat	O
	vfwscanf	X		wcscmp	O
	swscanf	D		wcsncmp	O
	vswscanf	D		wmemcmp	O
	wscanf	X		wcschr	O
	vwscanf	X		wcscspn	O
	fgetwc	X		wcspbrk	O
	fgetws	X		wcsrchr	O
	fputwc	X		wcsspn	O
	fputws	X		wcsstr	O
	fwide	X		wcstok	O
	getwc	X		wmemchr	O
	getwchar	X		wcslen	O
	putwc	X		wmemset	O
	putwchar	X		mbsinit	O
	ungetwc	X		mbrlen	X

Notes 1.

If the function call is replaced by an instruction, the entry in the column for "Reentrant" in the table would become O (i.e. reentrance is possible) since the instruction does not update the errno variable. Refer to the item on -library in the section on compiler options for the conditions under which calls are replaced by instructions.

Notes 2.

If the function call is replaced by code that uses a trigonometric function unit, the entry in the column for "Reentrant" in the table might become X (i.e. non-reentrant). For details, refer to the item about -tfu in the section on compile options.