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PUTS(3P)                   POSIX Programmer's Manual                  PUTS(3P)
PROLOG
       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.
NAME
       puts -- put a string on standard output
SYNOPSIS
       #include <stdio.h>
       int puts(const char *s);
DESCRIPTION
       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.
       The puts() function shall write the string pointed to by s, followed by
       a <newline>, to the standard output  stream  stdout.   The  terminating
       null byte shall not be written.
       The  last  data  modification and last file status change timestamps of
       the file shall be marked for update between the successful execution of
       puts()  and  the  next  successful  completion of a call to fflush() or
       fclose() on the same stream or a call to exit() or abort().
RETURN VALUE
       Upon successful completion, puts() shall return a non-negative  number.
       Otherwise,  it  shall  return EOF, shall set an error indicator for the
       stream, and errno shall be set to indicate the error.
ERRORS
       Refer to fputc().
       The following sections are informative.
EXAMPLES
   Printing to Standard Output
       The following example gets the current time, converts it  to  a  string
       using localtime() and asctime(), and prints it to standard output using
       puts().  It then prints the number of minutes to an event for which  it
       is waiting.
           #include <time.h>
           #include <stdio.h>
           ...
           time_t now;
           int minutes_to_event;
           ...
           time(&now);
           printf("The time is ");
           puts(asctime(localtime(&now)));
           printf("There are %d minutes to the event.\n",
               minutes_to_event);
           ...
APPLICATION USAGE
       The puts() function appends a <newline>, while fputs() does not.
       This  volume of POSIX.1-2008 requires that successful completion simply
       return a non-negative integer. There are at least three known different
       implementation conventions for this requirement:
        *  Return a constant value.
        *  Return the last character written.
        *  Return  the  number of bytes written. Note that this implementation
           convention cannot be adhered to for strings longer  than  {INT_MAX}
           bytes as the value would not be representable in the return type of
           the function.  For  backwards  compatibility,  implementations  can
           return  the  number  of bytes for strings of up to {INT_MAX} bytes,
           and return {INT_MAX} for all longer strings.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       Section 2.5, Standard I/O Streams, fopen(), fputs(), putc()
       The Base Definitions volume of POSIX.1-2008, <stdio.h>
COPYRIGHT
       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 Electri-
       cal 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 http://www.unix.org/online.html .
       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                             PUTS(3P)