NAME
puts(), fputs() — put a string on a stream
SYNOPSIS
#include <stdio.h>
int puts(const char *s);
int fputs(const char *s, FILE *stream);
Obsolescent Interfaces
int puts_unlocked(const char *s);
int fputs_unlocked(const char *s, FILE *stream);
DESCRIPTION
puts()
writes the null-terminated string pointed to by
s,
followed by a new-line character, to the standard output stream
stdout.
fputs()
writes the null-terminated string pointed to by
s
to the named output
stream,
but does
not
append a new-line character.
Neither function writes the terminating null character.
Obsolescent Interfaces
puts_unlocked()
and
fputs_unlocked()
put a string on a stream.
APPLICATION USAGE
puts()
and
fputs()
are thread-safe interfaces. These interfaces are not async-cancel-safe.
A cancellation point may occur when a thread is executing
puts()
or
fputs().
RETURN VALUE
Upon successful completion, these routines
return a non-negative number.
Otherwise they return
EOF,
set the error indicator for the stream, and set
errno
to indicate the error.
ERRORS
These routines fail if, either the
stream
is unbuffered or
stream's
buffer needed to be flushed causing an underlying
write()
call to be invoked, and:
- [EAGAIN]
The
O_NONBLOCK
flag is set for the file descriptor underlying
stream
and the process would be delayed in the write operation.
- [EBADF]
The file descriptor underlying
stream
is not a valid file descriptor open for writing.
- [EFBIG]
An attempt was made to write to a file
that exceeds the process's file size limit
or the maximum file size (see
ulimit(2)).
- [EINTR]
A signal was caught during the
write()
system call.
- [EIO]
The process is in a background process group
and is attempting to write to its controlling terminal,
TOSTOP
is set, the process is neither ignoring nor blocking the
SIGTTOU
signal, and the process group of the process is orphaned.
- [ENOSPC]
There was no free space remaining on the device containing the file.
- [EPIPE]
An attempt is made to write to a pipe or
FIFO
that is not open for reading by any process.
A
SIGPIPE
signal is also sent to the process.
Additional
errno
values may be set by the underlying
write()
function (see
write(2)).
WARNINGS
puts_unlocked()
and
fputs_unlocked()
are obsolescent interfaces supported only for compatibility with
existing DCE applications. New multithreaded applications should use
puts()
and
fputs().
NOTES
puts()
and
puts_unlocked()
append a new-line character;
fputs()
and
fputs_unlocked()
do not.
STANDARDS CONFORMANCE
puts(): AES, SVID2, SVID3, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1, ANSI C
fputs(): AES, SVID2, SVID3, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1, ANSI C
