PUTS(3)                    POSIX Programmer's Manual                   PUTS(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NNAAMMEE
       puts -- put a string on standard output

SSYYNNOOPPSSIISS
       #include <stdio.h>

       int puts(const char *_s);

DDEESSCCRRIIPPTTIIOONN
       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.1-2017
       defers to the ISO C standard.

       The _p_u_t_s() function shall write the string pointed to by _s, followed by
       a <newline>, to the standard output stream _s_t_d_o_u_t.  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
       _p_u_t_s() and the next successful completion of a call to _f_f_l_u_s_h() or
       _f_c_l_o_s_e() on the same stream or a call to _e_x_i_t() or _a_b_o_r_t().

RREETTUURRNN VVAALLUUEE
       Upon successful completion, _p_u_t_s() shall return a non-negative number.
       Otherwise, it shall return EOF, shall set an error indicator for the
       stream, and _e_r_r_n_o shall be set to indicate the error.

EERRRROORRSS
       Refer to _f_p_u_t_c().

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
   PPrriinnttiinngg ttoo SSttaannddaarrdd OOuuttppuutt
       The following example gets the current time, converts it to a string
       using _l_o_c_a_l_t_i_m_e() and _a_s_c_t_i_m_e(), and prints it to standard output using
       _p_u_t_s().  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);
           ...

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       The _p_u_t_s() function appends a <newline>, while _f_p_u_t_s() does not.

       This volume of POSIX.1-2017 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.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _S_e_c_t_i_o_n _2_._5, _S_t_a_n_d_a_r_d _I_/_O _S_t_r_e_a_m_s, _f_o_p_e_n(), _f_p_u_t_s(), _p_u_t_c()

       The Base Definitions volume of POSIX.1-2017, <<ssttddiioo..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  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.opengroup.org/unix/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.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                              PUTS(3)
