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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 4.15 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 2017-09-15 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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