diff options
Diffstat (limited to 'newlib/libc/stdio/fwrite.c')
| -rw-r--r-- | newlib/libc/stdio/fwrite.c | 51 |
1 files changed, 48 insertions, 3 deletions
diff --git a/newlib/libc/stdio/fwrite.c b/newlib/libc/stdio/fwrite.c index f460ae38f..6b3ff9015 100644 --- a/newlib/libc/stdio/fwrite.c +++ b/newlib/libc/stdio/fwrite.c @@ -17,22 +17,35 @@ /* FUNCTION -<<fwrite>>---write array elements +<<fwrite>>, <<fwrite_unlocked>>---write array elements INDEX fwrite INDEX + fwrite_unlocked +INDEX _fwrite_r +INDEX + _fwrite_unlocked_r ANSI_SYNOPSIS #include <stdio.h> size_t fwrite(const void *restrict <[buf]>, size_t <[size]>, size_t <[count]>, FILE *restrict <[fp]>); + #define _BSD_SOURCE + #include <stdio.h> + size_t fwrite_unlocked(const void *restrict <[buf]>, size_t <[size]>, + size_t <[count]>, FILE *restrict <[fp]>); + #include <stdio.h> size_t _fwrite_r(struct _reent *<[ptr]>, const void *restrict <[buf]>, size_t <[size]>, size_t <[count]>, FILE *restrict <[fp]>); + #include <stdio.h> + size_t _fwrite_unlocked_r(struct _reent *<[ptr]>, const void *restrict <[buf]>, size_t <[size]>, + size_t <[count]>, FILE *restrict <[fp]>); + TRAD_SYNOPSIS #include <stdio.h> size_t fwrite(<[buf]>, <[size]>, <[count]>, <[fp]>) @@ -41,6 +54,14 @@ TRAD_SYNOPSIS size_t <[count]>; FILE *<[fp]>; + #define _BSD_SOURCE + #include <stdio.h> + size_t fwrite_unlocked(<[buf]>, <[size]>, <[count]>, <[fp]>) + char *<[buf]>; + size_t <[size]>; + size_t <[count]>; + FILE *<[fp]>; + #include <stdio.h> size_t _fwrite_r(<[ptr]>, <[buf]>, <[size]>, <[count]>, <[fp]>) struct _reent *<[ptr]>; @@ -49,6 +70,14 @@ TRAD_SYNOPSIS size_t <[count]>; FILE *<[fp]>; + #include <stdio.h> + size_t _fwrite_unlocked_r(<[ptr]>, <[buf]>, <[size]>, <[count]>, <[fp]>) + struct _reent *<[ptr]>; + char *<[buf]>; + size_t <[size]>; + size_t <[count]>; + FILE *<[fp]>; + DESCRIPTION <<fwrite>> attempts to copy, starting from the memory location <[buf]>, <[count]> elements (each of size <[size]>) into the file or @@ -58,8 +87,17 @@ stream identified by <[fp]>. <<fwrite>> may copy fewer elements than <<fwrite>> also advances the file position indicator (if any) for <[fp]> by the number of @emph{characters} actually written. -<<_fwrite_r>> is simply the reentrant version of <<fwrite>> that -takes an additional reentrant structure argument: <[ptr]>. +<<fwrite_unlocked>> is a non-thread-safe version of <<fwrite>>. +<<fwrite_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 +<<fwrite_unlocked>> is equivalent to <<fwrite>>. + +<<_fwrite_r>> and <<_fwrite_unlocked_r>> are simply reentrant versions of the +above that take an additional reentrant structure argument: <[ptr]>. RETURNS If <<fwrite>> succeeds in writing all the elements you specify, the @@ -70,6 +108,8 @@ the file. PORTABILITY ANSI C requires <<fwrite>>. +<<fwrite_unlocked>> is a BSD extension also provided by GNU libc. + Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>, <<read>>, <<sbrk>>, <<write>>. */ @@ -89,6 +129,11 @@ static char sccsid[] = "%W% (Berkeley) %G%"; #include "fvwrite.h" #endif +#ifdef __IMPL_UNLOCKED__ +#define _fwrite_r _fwrite_unlocked_r +#define fwrite fwrite_unlocked +#endif + /* * Write `count' objects (each size `size') from memory to the given file. * Return the number of whole objects written. |