E.1.14.1 (7.1.6) The null pointer constant to which the macro NULL expands:

NULL equals 0.

(7.2) The diagnostic printed by and the termination behavior of the assert function:

The diagnostic is:

Assertion failed: statement. file filename, line number

Where:

• statement is the statement which failed the assertion

• filename is the name of the file containing the failure

• line number is the number of the line on which the failure occurs

(7.3.1) The sets of characters tested for by the isalnum, isalpha, iscntrl, islower, isprint, and isupper functions:

Table E–6 Character Sets Tested by isalpha, islower, etc.

isalnum	ASCII characters A-Z, a-z and 0-9
isalpha	ASCII characters A-Z and a-z, plus locale-specific single-byte letters
iscntrl	ASCII characters with value 0-31 and 127
islower	ASCII characters a-z
isprint	Locale-specific single-byte printable characters
isupper	ASCII characters A-Z

(7.5.1) The values returned by the mathematics functions on domain errors:

Table E–7 Values Returned on Domain Errors

Error	Math Functions	Compiler Modes
		-Xs, -Xt	-Xa, -Xc
DOMAIN	acos(|x|>1)	0.0	0.0
DOMAIN	asin(|x|>1)	0.0	0.0
DOMAIN	atan2(+-0,+-0)	0.0	0.0
DOMAIN	y0(0)	-HUGE	-HUGE_VAL
DOMAIN	y0(x<0)	-HUGE	-HUGE_VAL
DOMAIN	y1(0)	-HUGE	-HUGE_VAL
DOMAIN	y1(x<0)	-HUGE	-HUGE_VAL
DOMAIN	yn(n,0)	-HUGE	-HUGE_VAL
DOMAIN	yn(n,x<0)	-HUGE	-HUGE_VAL
DOMAIN	log(x<0)	-HUGE	-HUGE_VAL
DOMAIN	log10(x<0)	-HUGE	-HUGE_VAL
DOMAIN	pow(0,0)	0.0	1.0
DOMAIN	pow(0,neg)	0.0	-HUGE_VAL
DOMAIN	pow(neg,non-integal)	0.0	NaN
DOMAIN	sqrt(x<0)	0.0	NaN
DOMAIN	fmod(x,0)	x	NaN
DOMAIN	remainder(x,0)	NaN	NaN
DOMAIN	acosh(x<1)	NaN	NaN
DOMAIN	atanh(|x|>1)	NaN	NaN

(7.5.1) Whether the mathematics functions set the integer expression errno to the value of the macro ERANGE on underflow range errors:

Mathematics functions, except scalbn, set errno to ERANGE when underflow is detected.

(7.5.6.4) Whether a domain error occurs or zero is returned when the fmod function has a second argument of zero:

In this case, it returns the first argument with domain error.

(7.7.1.1) The set of signals for the signal function:

The following table shows the semantics for each signal as recognized by the signal function:

Table E–8 Semantics for signal Signals

Signal	No.	Default	Event
SIGHUP	1	Exit	hangup
SIGINT	2	Exit	interrupt
SIGQUIT	3	Core	quit
SIGILL	4	Core	illegal instruction (not reset when caught)
SIGTRAP	5	Core	trace trap (not reset when caught)
SIGIOT	6	Core	IOT instruction
SIGABRT	6	Core	Used by abort
SIGEMT	7	Core	EMT instruction
SIGFPE	8	Core	floating point exception
SIGKILL	9	Exit	kill (cannot be caught or ignored)
SIGBUS	10	Core	bus error
SIGSEGV	11	Core	segmentation violation
SIGSYS	12	Core	bad argument to system call
SIGPIPE	13	Exit	write on a pipe with no one to read it
SIGALRM	14	Exit	alarm clock
SIGTERM	15	Exit	software termination signal from kill
SIGUSR1	16	Exit	user defined signal 1
SIGUSR2	17	Exit	user defined signal 2
SIGCLD	18	Ignore	child status change
SIGCHLD	18	Ignore	child status change alias
SIGPWR	19	Ignore	power-fail restart
SIGWINCH	20	Ignore	window size change
SIGURG	21	Ignore	urgent socket condition
SIGPOLL	22	Exit	pollable event occurred
SIGIO	22	Exit	socket I/O possible
SIGSTOP	23	Stop	stop (cannot be caught or ignored)
SIGTSTP	24	Stop	user stop requested from tty
SIGCONT	25	Ignore	stopped process has been continued
SIGTTIN	26	Stop	background tty read attempted
SIGTTOU	27	Stop	background tty write attempted
SIGVTALRM	28	Exit	virtual timer expired
SIGPROF	29	Exit	profiling timer expired
SIGXCPU	30	Core	exceeded cpu limit
SIGXFSZ	31	Core	exceeded file size limit
SIGWAITINGT	32	Ignore	process’s lwps are blocked

(7.7.1.1) The default handling and the handling at program startup for each signal recognized by the signal function:

See above.

(7.7.1.1) If the equivalent of signal(sig, SIG_DFL); is not executed prior to the call of a signal handler, the blocking of the signal that is performed:

The equivalent of signal(sig,SIG_DFL) is always executed.

(7.7.1.1) Whether the default handling is reset if the SIGILL signal is received by a handler specified to the signal function:

Default handling is not reset in SIGILL.

(7.9.2) Whether the last line of a text stream requires a terminating new-line character:

The last line does not need to end in a newline.

(7.9.2) Whether space characters that are written out to a text stream immediately before a new-line character appear when read in:

All characters appear when the stream is read.

(7.9.2) The number of null characters that may be appended to data written to a binary stream:

No null characters are appended to a binary stream.

(7.9.3) Whether the file position indicator of an append mode stream is initially positioned at the beginning or end of the file:

The file position indicator is initially positioned at the end of the file.

(7.9.3) Whether a write on a text stream causes the associated file to be truncated beyond that point:

A write on a text stream does not cause a file to be truncated beyond that point unless a hardware device forces it to happen.

(7.9.3) The characteristics of file buffering:

Output streams, with the exception of the standard error stream (stderr), are by default-buffered if the output refers to a file, and line-buffered if the output refers to a terminal. The standard error output stream (stderr) is by default unbuffered.

A buffered output stream saves many characters, and then writes the characters as a block. An unbuffered output stream queues information for immediate writing on the destination file or terminal immediately. Line-buffered output queues each line of output until the line is complete (a newline character is requested).

(7.9.3) Whether a zero-length file actually exists:

A zero-length file does exist since it has a directory entry.

(7.9.3) The rules for composing valid file names:

A valid file name can be from 1 to 1,023 characters in length and can use all character except the characters null and / (slash).

(7.9.3) Whether the same file can be open multiple times:

The same file can be opened multiple times.

(7.9.4.1) The effect of the remove function on an open file:

The file is deleted on the last call which closes the file. A program cannot open a file which has already been removed.

(7.9.4.2) The effect if a file with the new name exists prior to a call to the rename function:

If the file exists, it is removed and the new file is written over the previously existing file.

(7.9.6.1) The output for %p conversion in the fprintf function:

The output for %p is equivalent to %x.

(7.9.6.2) The input for %p conversion in the fscanf function:

The input for %p is equivalent to %x.

(7.9.6.2) The interpretation of a- character that is neither the first nor the last character in the scan list for %[ conversion in the fscanf function:

The- character indicates an inclusive range; thus, [0-9] is equivalent to [0123456789].