diff options
Diffstat (limited to 'man-pages-posix-2017/man3p/tmpfile.3p')
| -rw-r--r-- | man-pages-posix-2017/man3p/tmpfile.3p | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/man-pages-posix-2017/man3p/tmpfile.3p b/man-pages-posix-2017/man3p/tmpfile.3p new file mode 100644 index 0000000..be5d7b4 --- /dev/null +++ b/man-pages-posix-2017/man3p/tmpfile.3p @@ -0,0 +1,152 @@ +'\" et +.TH TMPFILE "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual" +.\" +.SH PROLOG +This manual page is part of the POSIX Programmer's Manual. +The Linux implementation of this interface may differ (consult +the corresponding Linux manual page for details of Linux behavior), +or the interface may not be implemented on Linux. +.\" +.SH NAME +tmpfile +\(em create a temporary file +.SH SYNOPSIS +.LP +.nf +#include <stdio.h> +.P +FILE *tmpfile(void); +.fi +.SH DESCRIPTION +The functionality described on this reference page is aligned with the +ISO\ C standard. Any conflict between the requirements described here and the +ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard. +.P +The +\fItmpfile\fR() +function shall create a temporary file and open a corresponding +stream. The file shall be automatically deleted when all references +to the file are closed. The file shall be opened as in +\fIfopen\fR() +for update (\fIwb\fP+), except that implementations may restrict the +permissions, either by clearing the file mode bits or setting them +to the value S_IRUSR | S_IWUSR. +.P +In some implementations, a permanent file may be left behind if +the process calling +\fItmpfile\fR() +is killed while it is processing a call to +\fItmpfile\fR(). +.P +An error message may be written to standard error if the stream cannot +be opened. +.SH "RETURN VALUE" +Upon successful completion, +\fItmpfile\fR() +shall return a pointer to the stream of the file that is created. +Otherwise, it shall return a null pointer +and set +.IR errno +to indicate the error. +.SH ERRORS +The +\fItmpfile\fR() +function shall fail if: +.TP +.BR EINTR +A signal was caught during +\fItmpfile\fR(). +.TP +.BR EMFILE +All file descriptors available to the process are currently open. +.TP +.BR EMFILE +{STREAM_MAX} +streams are currently open in the calling process. +.TP +.BR ENFILE +The maximum allowable number of files is currently open in the system. +.TP +.BR ENOSPC +The directory or file system which would contain the new file cannot be +expanded. +.TP +.BR EOVERFLOW +The file is a regular file and the size of the file cannot be +represented correctly in an object of type +.BR off_t . +.P +The +\fItmpfile\fR() +function may fail if: +.TP +.BR EMFILE +{FOPEN_MAX} +streams are currently open in the calling process. +.TP +.BR ENOMEM +Insufficient storage space is available. +.LP +.IR "The following sections are informative." +.SH EXAMPLES +.SS "Creating a Temporary File" +.P +The following example creates a temporary file for update, and returns +a pointer to a stream for the created file in the +.IR fp +variable. +.sp +.RS 4 +.nf + +#include <stdio.h> +\&... +FILE *fp; +.P +fp = tmpfile (); +.fi +.P +.RE +.SH "APPLICATION USAGE" +It should be possible to open at least +{TMP_MAX} +temporary files during the lifetime of the program (this limit may be +shared with +\fItmpnam\fR()) +and there should be no limit on the number simultaneously open other +than this limit and any limit on the number of open file descriptors +or streams (\c +{OPEN_MAX}, +{FOPEN_MAX}, +{STREAM_MAX}). +.SH RATIONALE +None. +.SH "FUTURE DIRECTIONS" +None. +.SH "SEE ALSO" +.IR "Section 2.5" ", " "Standard I/O Streams", +.IR "\fIfopen\fR\^(\|)", +.IR "\fImkdtemp\fR\^(\|)", +.IR "\fItmpnam\fR\^(\|)", +.IR "\fIunlink\fR\^(\|)" +.P +The Base Definitions volume of POSIX.1\(hy2017, +.IR "\fB<stdio.h>\fP" +.\" +.SH COPYRIGHT +Portions of this text are reprinted and reproduced in electronic form +from IEEE Std 1003.1-2017, Standard for Information Technology +-- Portable Operating System Interface (POSIX), The Open Group Base +Specifications Issue 7, 2018 Edition, +Copyright (C) 2018 by the Institute of +Electrical and Electronics Engineers, Inc and The Open Group. +In the event of any discrepancy between this version and the original IEEE and +The Open Group Standard, the original IEEE and The Open Group Standard +is the referee document. The original Standard can be obtained online at +http://www.opengroup.org/unix/online.html . +.PP +Any typographical or formatting errors that appear +in this page are most likely +to have been introduced during the conversion of the source files to +man page format. To report such errors, see +https://www.kernel.org/doc/man-pages/reporting_bugs.html . |