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.TH STDIO.H 3HEAD "Sep 10, 2004"
.SH NAME
stdio.h, stdio \- standard buffered input/output
.SH SYNOPSIS
.LP
.nf
#include <\fBstdio.h\fR>
.fi

.SH DESCRIPTION
.sp
.LP
The <\fBstdio.h\fR> header defines the following macros as positive integer
constant expressions:
.sp
.ne 2
.na
\fB\fBBUFSIZ\fR\fR
.ad
.RS 13n
size of <\fBstdio.h\fR> buffers
.RE

.sp
.ne 2
.na
\fB\fB_IOFBF\fR\fR
.ad
.RS 13n
input/output fully buffered
.RE

.sp
.ne 2
.na
\fB\fB_IOLBF\fR\fR
.ad
.RS 13n
input/output line buffered
.RE

.sp
.ne 2
.na
\fB\fB_IONBF\fR\fR
.ad
.RS 13n
input/output unbuffered
.RE

.sp
.ne 2
.na
\fB\fBL_ctermid\fR\fR
.ad
.RS 13n
maximum size of character array to hold \fBctermid()\fR output
.RE

.sp
.ne 2
.na
\fB\fBL_tmpnam\fR\fR
.ad
.RS 13n
maximum size of character array to hold \fBtmpnam()\fR output
.RE

.sp
.ne 2
.na
\fB\fBSEEK_CUR\fR\fR
.ad
.RS 13n
seek relative to current position
.RE

.sp
.ne 2
.na
\fB\fBSEEK_END\fR\fR
.ad
.RS 13n
seek relative to end-of-file
.RE

.sp
.ne 2
.na
\fB\fBSEEK_SET\fR\fR
.ad
.RS 13n
seek relative to start-of-file
.RE

.sp
.LP
The following macros are defined as positive integer constant expressions that
denote implementation limits:
.sp
.ne 2
.na
\fB{\fBFILENAME_MAX\fR}\fR
.ad
.RS 18n
Maximum size in bytes of the longest filename string that the implementation
guarantees can be opened.
.RE

.sp
.ne 2
.na
\fB{\fBFOPEN_MAX\fR}\fR
.ad
.RS 18n
Number of streams that the implementation guarantees can be open
simultaneously. The value is at least eight.
.RE

.sp
.ne 2
.na
\fB{\fBTMP_MAX\fR}\fR
.ad
.RS 18n
Minimum number of unique filenames generated by \fBtmpnam()\fR. Maximum number
of times an application can call \fBtmpnam()\fR reliably. The value of
{\fBTMP_MAX\fR} is at least 25. On XSI-conformant systems, the value of
{\fBTMP_MAX\fR} is at least 10000.
.RE

.sp
.LP
The following macro name is defined as a negative integer constant expression:
.sp
.ne 2
.na
\fB\fBEOF\fR\fR
.ad
.RS 7n
end-of-file return value
.RE

.sp
.LP
The following macro name is defined as a null pointer constant:
.sp
.ne 2
.na
\fB\fBNULL\fR\fR
.ad
.RS 8n
null pointer
.RE

.sp
.LP
The following macro name is defined as a string constant:
.sp
.ne 2
.na
\fB\fBP_tmpdir\fR\fR
.ad
.RS 12n
default directory prefix for \fBtempnam()\fR
.RE

.sp
.LP
The following is defined as expressions of type "pointer to \fBFILE\fR" point
to the \fBFILE\fR objects associated, respectively, with the standard error,
input, and output streams:
.sp
.ne 2
.na
\fB\fBstderr\fR\fR
.ad
.RS 10n
standard error output stream
.RE

.sp
.ne 2
.na
\fB\fBstdin\fR\fR
.ad
.RS 10n
standard input stream
.RE

.sp
.ne 2
.na
\fB\fBstdout\fR\fR
.ad
.RS 10n
standard output stream
.RE

.sp
.LP
The following data types are defined through \fBtypedef\fR:
.sp
.ne 2
.na
\fB\fBFILE\fR\fR
.ad
.RS 11n
structure containing information about a file
.RE

.sp
.ne 2
.na
\fB\fBfpos_t\fR\fR
.ad
.RS 11n
non-array type containing all information needed to specify uniquely every
position within a file
.RE

.sp
.ne 2
.na
\fB\fBva_list\fR\fR
.ad
.RS 11n
as described in <\fBstdarg.h\fR>
.RE

.sp
.ne 2
.na
\fB\fBsize_t\fR\fR
.ad
.RS 11n
as described in <\fBstddef.h\fR>
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
.TE

.SH SEE ALSO
.sp
.LP
.BR rename (2),
.BR ctermid (3C),
.BR fclose (3C),
.BR fdopen (3C),
.BR fflush (3C),
.BR fgetc (3C),
.BR fgetpos (3C),
.BR fgets (3C),
.BR flockfile (3C),
.BR fopen (3C),
.BR fputc (3C),
.BR fputs (3C),
.BR fputwc (3C),
.BR fread (3C),
.BR freopen (3C),
.BR fseek (3C),
.BR fsetpos (3C),
.BR ftell (3C),
.BR fwrite (3C),
.BR getopt (3C),
.BR getwchar (3C),
.BR perror (3C),
.BR popen (3C),
.BR printf (3C),
.BR remove (3C),
.BR rewind (3C),
.BR scanf (3C),
.BR setbuf (3C),
.BR stdio (3C),
.BR system (3C),
.BR tmpfile (3C),
.BR tmpnam (3C),
.BR ungetc (3C),
.BR vprintf (3C),
.BR attributes (7),
.BR standards (7)