.TH INTRO 3F
.UC
.SH NAME
intro \- introduction to FORTRAN library functions
.SH DESCRIPTION
.LP
This section describes those functions that are in the FORTRAN run time
library.  The functions listed here provide an interface from \fIf77\fP
programs to the system in the same manner as the C library does for C
programs.  They are automatically loaded as needed by the Fortran compiler
.IR f77 (1).
.LP
Most of these functions are in libU77.a. Some are in libF77.a or libI77.a.
A few intrinsic functions are described for the sake of completeness.
.LP
For efficiency, the SCCS ID strings are not normally included in the
.I a.out
file. To include them, simply declare
.nf

	external f77lid

.fi
in any
.I f77
module.
.sp 2
.ce
\fIFunctions Available in the FORTRAN Library\fP
.sp
.nf
.ta 0.4i 2.5i
abort		terminate abruptly with memory image
access		determine accessability of a file
alarm		execute a subroutine after a specified time
bessel functions		of two kinds for integer orders
bit		bitwise functions
	and	bitwise and (see bit.3f)
	or	bitwise or (see bit.3f)
	xor	bitwise xor (see bit.3f)
	not	bitwise not (see bit.3f)
	rshift	right shift (see bit.3f)
	lshift	left shift (see bit.3f)
chdir		change default directory
chmod		change file modes
etime		return elapsed execution time
	dtime	return elapsed execution time (see etime.3f)
exit		terminate process with status
fdate		return date and time in an ASCII string
flmin		return smallest real value
	flmax	return largest real value (see flmin.3f)
	ffrac	return smallest fractional value (see flmin.3f)
	dflmin	return smallest double value (see flmin.3f)
	dflmax	return largest double value (see flmin.3f)
	dffrac	return smallest fractional double (see flmin.3f)
	inmax	return largest integer value (see flmin.3f)
flush		flush output to a logical unit
fork		create a copy of this process
fseek		reposition a file on a logical unit
	ftell	tell file position on logical unit (see fseek.3f)
getarg		command arguments to fortran
	iargc	command arguments to fortran (see getarg.3f)
getc		get a character from a logical unit
	fgetc	get a character from a logical unit (see getc.3f)
getcwd		get pathname of current working directory
getenv		get value of environment variables
getlog		get user's login name
getpid		get process id
getuid		get user ID of the caller
	getgid	get group ID of the caller (see getuid.3f)
hostnm		get name of host system
idate		return date in numerical form
	itime	return time in numerical form (see idate.3f)
index		find substring in character object
	rindex	find substring in character object (see index.3f)
	lnblnk	find end of character object (see index.3f)
	len	tell length of character object (see index.3f)
ioinit		initialize I/O system
kill		send a signal to a process
link		make a link to an existing file
	symlnk	create a symbolic link to a file (see link.3f)
loc		return the address of an object
long		convert to long integer
	short	convert to short integer (see long.3f)
perror		get system error messages
	gerror	get system error messages (see perror.3f)
	ierrno	get system error number (see perror.3f)
putc		write a character to a logical unit
	fputc	write a character to a logical unit (see putc.3f)
qsort		quick sort
rand		return random values
	drand	return random values (see rand.3f)
	irand	return random values (see rand.3f)
signal		change the action for a signal
sleep		sleep for awhile
stat		get file status
	fstat	get file status (see stat.3f)
	lstat	get file status (see stat.3f)
system		execute a unix command
time		return system time
	ctime	return system time (see time.3f)
	ltime	return system time (see time.3f)
	gmtime	return system time (see time.3f)
topen		open channel to magnetic tape device
	tclose	close tape channel (see topen.3f)
	tread	read tape device (see topen.3f)
	twrite	write tape device (see topen.3f)
	trewin	rewind tape device (see topen.3f)
	tskipf	skip forward on tape device (see topen.3f)
	tstate	get tape device status (see topen.3f)
traper		trap arithmetic errors
trapov		trap and repair floating point errors (obsolete)
trpfpe		trap and repair floating point errors
	fpecnt	how many faults have there been (see trpfpe.3f)
ttynam		find name of a terminal port
	isatty	is logical unit open to a tty port (see ttynam.3f)
unlink		remove a directory entry
wait		wait for a process to terminate
.fi