Reentrant Library

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 would become X (i.e. non-reentrant).
Refer to the item on -tfu in the section on compiler options for the conditions under which calls are replaced by instructions for the trigonometric function unit.

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 would become X (i.e. non-reentrant).
Refer to the item on -tfu in the section on compiler options for the conditions under which calls are replaced by instructions for the trigonometric function unit.