Section: POSIX Programmer's Manual (3P)
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.
--- get a string from a
char *gets(char *s);
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.1-2008 defers to the ISO C standard.
function shall read bytes from the standard input stream,
into the array pointed to by
is read or an end-of-file condition is encountered. Any
shall be discarded and a null byte shall be placed immediately
after the last byte read into the array.
function may mark the last data access timestamp of
the file associated with
for update. The last data access timestamp shall be
marked for update by the first successful execution of
that returns data not supplied by a prior call to
Upon successful completion,
If the end-of-file indicator for the stream is set, or if the stream
is at end-of-file, the end-of-file indicator for the
stream shall be set and
shall return a null pointer. If a read error occurs, the error indicator
for the stream shall be set,
shall return a null pointer,
to indicate the error.
The following sections are informative.
Reading a line that overflows the array pointed to by
results in undefined behavior. The use of
Since the user cannot specify the length of the buffer passed to
use of this function is discouraged. The length of the string read is
unlimited. It is possible to overflow this buffer in such a way as to
cause applications to fail, or possible system security violations.
Applications should use the
function instead of the obsolescent
The standard developers decided to mark the
function as obsolescent even though it is in the ISO C standard due to the
possibility of buffer overflow.
function may be removed in a future version.
, Standard I/O Streams,
The Base Definitions volume of POSIX.1-2008,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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
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