diff options
Diffstat (limited to 'newlib/libc/stdio/fputc.c')
| -rw-r--r-- | newlib/libc/stdio/fputc.c | 41 |
1 files changed, 38 insertions, 3 deletions
diff --git a/newlib/libc/stdio/fputc.c b/newlib/libc/stdio/fputc.c index f380717d1..0aad0a9f7 100644 --- a/newlib/libc/stdio/fputc.c +++ b/newlib/libc/stdio/fputc.c @@ -17,32 +17,55 @@ /* FUNCTION -<<fputc>>---write a character on a stream or file +<<fputc>>, <<fputc_unlocked>>---write a character on a stream or file INDEX fputc INDEX + fputc_unlocked +INDEX _fputc_r +INDEX + _fputc_unlocked_r ANSI_SYNOPSIS #include <stdio.h> int fputc(int <[ch]>, FILE *<[fp]>); + #define _BSD_SOURCE + #include <stdio.h> + int fputc_unlocked(int <[ch]>, FILE *<[fp]>); + #include <stdio.h> int _fputc_r(struct _rent *<[ptr]>, int <[ch]>, FILE *<[fp]>); + #include <stdio.h> + int _fputc_unlocked_r(struct _rent *<[ptr]>, int <[ch]>, FILE *<[fp]>); + TRAD_SYNOPSIS #include <stdio.h> int fputc(<[ch]>, <[fp]>) int <[ch]>; FILE *<[fp]>; + #define _BSD_SOURCE + #include <stdio.h> + int fputc_unlocked(<[ch]>, <[fp]>) + int <[ch]>; + FILE *<[fp]>; + #include <stdio.h> int _fputc_r(<[ptr]>, <[ch]>, <[fp]>) struct _reent *<[ptr]>; int <[ch]>; FILE *<[fp]>; + #include <stdio.h> + int _fputc_unlocked_r(<[ptr]>, <[ch]>, <[fp]>) + struct _reent *<[ptr]>; + int <[ch]>; + FILE *<[fp]>; + DESCRIPTION <<fputc>> converts the argument <[ch]> from an <<int>> to an <<unsigned char>>, then writes it to the file or stream identified by @@ -56,8 +79,18 @@ oadvances by one. For a macro version of this function, see <<putc>>. -The <<_fputc_r>> function is simply a reentrant version of <<fputc>> -that takes an additional reentrant structure argument: <[ptr]>. +<<fputc_unlocked>> is a non-thread-safe version of <<fputc>>. +<<fputc_unlocked>> may only safely be used within a scope +protected by flockfile() (or ftrylockfile()) and funlockfile(). This +function may safely be used in a multi-threaded program if and only +if they are called while the invoking thread owns the (FILE *) +object, as is the case after a successful call to the flockfile() or +ftrylockfile() functions. If threads are disabled, then +<<fputc_unlocked>> is equivalent to <<fputc>>. + +The <<_fputc_r>> and <<_fputc_unlocked_r>> functions are simply reentrant +versions of the above that take an additional reentrant structure +argument: <[ptr]>. RETURNS If successful, <<fputc>> returns its argument <[ch]>. If an error @@ -67,6 +100,8 @@ query for errors. PORTABILITY <<fputc>> is required by ANSI C. +<<fputc_unlocked>> is a BSD extension also provided by GNU libc. + Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>, <<read>>, <<sbrk>>, <<write>>. */ |