diff options
Diffstat (limited to 'newlib/libc/stdio/fread.c')
| -rw-r--r-- | newlib/libc/stdio/fread.c | 51 |
1 files changed, 48 insertions, 3 deletions
diff --git a/newlib/libc/stdio/fread.c b/newlib/libc/stdio/fread.c index cf9ab40b7..d55ff66d8 100644 --- a/newlib/libc/stdio/fread.c +++ b/newlib/libc/stdio/fread.c @@ -17,22 +17,35 @@ /* FUNCTION -<<fread>>---read array elements from a file +<<fread>>. <<fread_unlocked>>---read array elements from a file INDEX fread INDEX + fread_unlocked +INDEX _fread_r +INDEX + _fread_unlocked_r ANSI_SYNOPSIS #include <stdio.h> size_t fread(void *restrict <[buf]>, size_t <[size]>, size_t <[count]>, FILE *restrict <[fp]>); + #define _BSD_SOURCE + #include <stdio.h> + size_t fread_unlocked(void *restrict <[buf]>, size_t <[size]>, size_t <[count]>, + FILE *restrict <[fp]>); + #include <stdio.h> size_t _fread_r(struct _reent *<[ptr]>, void *restrict <[buf]>, size_t <[size]>, size_t <[count]>, FILE *restrict <[fp]>); + #include <stdio.h> + size_t _fread_unlocked_r(struct _reent *<[ptr]>, void *restrict <[buf]>, + size_t <[size]>, size_t <[count]>, FILE *restrict <[fp]>); + TRAD_SYNOPSIS #include <stdio.h> size_t fread(<[buf]>, <[size]>, <[count]>, <[fp]>) @@ -41,6 +54,14 @@ TRAD_SYNOPSIS size_t <[count]>; FILE *<[fp]>; + #define _BSD_SOURCE + #include <stdio.h> + size_t fread_unlocked(<[buf]>, <[size]>, <[count]>, <[fp]>) + char *<[buf]>; + size_t <[size]>; + size_t <[count]>; + FILE *<[fp]>; + #include <stdio.h> size_t _fread_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 _fread_unlocked_r(<[ptr]>, <[buf]>, <[size]>, <[count]>, <[fp]>) + struct _reent *<[ptr]>; + char *<[buf]>; + size_t <[size]>; + size_t <[count]>; + FILE *<[fp]>; + DESCRIPTION <<fread>> attempts to copy, from the file or stream identified by <[fp]>, <[count]> elements (each of size <[size]>) into memory, @@ -58,8 +87,17 @@ starting at <[buf]>. <<fread>> may copy fewer elements than <<fread>> also advances the file position indicator (if any) for <[fp]> by the number of @emph{characters} actually read. -<<_fread_r>> is simply the reentrant version of <<fread>> that -takes an additional reentrant structure pointer argument: <[ptr]>. +<<fread_unlocked>> is a non-thread-safe version of <<fread>>. +<<fread_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 +<<fread_unlocked>> is equivalent to <<fread>>. + +<<_fread_r>> and <<_fread_unlocked_r>> are simply reentrant versions of the +above that take an additional reentrant structure pointer argument: <[ptr]>. RETURNS The result of <<fread>> is the number of elements it succeeded in @@ -68,6 +106,8 @@ reading. PORTABILITY ANSI C requires <<fread>>. +<<fread_unlocked>> is a BSD extension also provided by GNU libc. + Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>, <<read>>, <<sbrk>>, <<write>>. */ @@ -78,6 +118,11 @@ Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, #include <malloc.h> #include "local.h" +#ifdef __IMPL_UNLOCKED__ +#define _fread_r _fread_unlocked_r +#define fread fread_unlocked +#endif + #ifdef __SCLE static size_t _DEFUN(crlf_r, (ptr, fp, buf, count, eof), |