gets(3) — Linux manual page


GETS(3)                   Linux Programmer's Manual                  GETS(3)

NAME         top

       gets - get a string from standard input (DEPRECATED)

SYNOPSIS         top

       #include <stdio.h>

       char *gets(char *s);

DESCRIPTION         top

       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

RETURN VALUE         top

       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.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface Attribute     Value   │
       │gets()    │ Thread safety │ MT-Safe │

CONFORMING TO         top

       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.

BUGS         top

       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

SEE ALSO         top

       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),

COLOPHON         top

       This page is part of release 5.08 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

GNU                              2017-09-15                          GETS(3)

Pages that refer to this page: fgetc(3)fgets(3)getc(3)getchar(3)stdio(3)ungetc(3)feature_test_macros(7)