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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | BUGS | SEE ALSO | COLOPHON |
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gets(3) Library Functions Manual gets(3)
gets - get a string from standard input (DEPRECATED)
Standard C library (libc, -lc)
#include <stdio.h>
[[deprecated]] 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 │
└──────────────────────────────────────┴───────────────┴─────────┘
POSIX.1-2008.
C89, 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 glibc 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 the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 gets(3)
Pages that refer to this page: fgetc(3), stdio(3), feature_test_macros(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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