fmemopen (3) Linux Manual Page
NAME
fmemopen – open memory as stream
SYNOPSIS
#include <stdio.h>
FILE *fmemopen(void *buf, size_t size, const char *mode);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
fmemopen():
-
- Since glibc 2.10:
- _POSIX_C_SOURCE >= 200809L
- Before glibc 2.10:
- _GNU_SOURCE
DESCRIPTION
The fmemopen() function opens a stream that permits the access specified by mode. The stream allows I/O to be performed on the string or memory buffer pointed to by buf.
The mode argument specifies the semantics of I/O on the stream, and is one of the following:
- r
- The stream is opened for reading.
- w
- The stream is opened for writing.
- a
- Append; open the stream for writing, with the initial buffer position set to the first null byte.
- r+
- Open the stream for reading and writing.
- w+
- Open the stream for reading and writing. The buffer contents are truncated (i.e., ‘