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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | BUGS | SEE ALSO | COLOPHON |
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GETS(3) Linux Programmer's Manual GETS(3)
gets - get a string from standard input (DEPRECATED)
#include <stdio.h>
char *gets(char *s);
Never use this function.
gets() reads a line from stdin into the buffer pointed to by s
until either a terminating newline or EOF, which it replaces with
a null byte ('\0'). No check for buffer overrun is performed
(see BUGS below).
gets() returns s on success, and NULL on error or when end of
file occurs while no characters have been read. However, given
the lack of buffer overrun checking, there can be no guarantees
that the function will even return.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│gets() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
C89, C99, POSIX.1-2001.
LSB deprecates gets(). POSIX.1-2008 marks gets() obsolescent.
ISO C11 removes the specification of gets() from the C language,
and since version 2.16, glibc header files don't expose the
function declaration if the _ISOC11_SOURCE feature test macro is
defined.
Never use gets(). Because it is impossible to tell without
knowing the data in advance how many characters gets() will read,
and because gets() will continue to store characters past the end
of the buffer, it is extremely dangerous to use. It has been
used to break computer security. Use fgets() instead.
For more information, see CWE-242 (aka "Use of Inherently
Dangerous Function") at
http://cwe.mitre.org/data/definitions/242.html
read(2), write(2), ferror(3), fgetc(3), fgets(3), fgetwc(3),
fgetws(3), fopen(3), fread(3), fseek(3), getline(3), getwchar(3),
puts(3), scanf(3), ungetwc(3), unlocked_stdio(3),
feature_test_macros(7)
This page is part of release 5.13 of the Linux man-pages project.
A description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2021-03-22 GETS(3)
Pages that refer to this page: fgetc(3), stdio(3), feature_test_macros(7)
Copyright and license for this manual page
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