diff options
| -rw-r--r-- | manual/math.texi | 11 | ||||
| -rw-r--r-- | manual/startup.texi | 16 |
2 files changed, 15 insertions, 12 deletions
diff --git a/manual/math.texi b/manual/math.texi index 9c0552d..a7d6c88 100644 --- a/manual/math.texi +++ b/manual/math.texi @@ -1360,14 +1360,15 @@ The prototypes for these functions are in @file{stdlib.h}. @comment stdlib.h @comment BSD -@deftypefun {int32_t} random (void) +@deftypefun {long int} random (void) This function returns the next pseudo-random number in the sequence. The value returned ranges from @code{0} to @code{RAND_MAX}. -@strong{Note:} Historically this function returned a @code{long int} -value. On 64-bit systems @code{long int} would have been larger than -programs expected, so @code{random} is now defined to return exactly 32 -bits. +@strong{Note:} Temporarily this function was defined to return a +@code{int32_t} value to indicate that the return value always contains +32 bits even if @code{long int} is wider. The standard demands it +differently. Users must always be aware of the 32-bit limitation, +though. @end deftypefun @comment stdlib.h diff --git a/manual/startup.texi b/manual/startup.texi index 526d19d..66c4a88 100644 --- a/manual/startup.texi +++ b/manual/startup.texi @@ -364,23 +364,25 @@ the old entry is replaced by the new one. Please note that you cannot remove an entry completely using this function. -This function is part of the BSD library. The GNU C Library provides -this function for compatibility but it may not be available on other -systems. +This function was originally part of the BSD library but is now part of +the Unix standard. @end deftypefun @comment stdlib.h @comment BSD -@deftypefun void unsetenv (const char *@var{name}) +@deftypefun int unsetenv (const char *@var{name}) Using this function one can remove an entry completely from the environment. If the environment contains an entry with the key @var{name} this whole entry is removed. A call to this function is equivalent to a call to @code{putenv} when the @var{value} part of the string is empty. -This function is part of the BSD library. The GNU C Library provides -this function for compatibility but it may not be available on other -systems. +The function return @code{-1} if @var{name} is a null pointer, points to +an empty string, or points to a string containing a @code{=} character. +It returns @code{0} if the call succeeded. + +This function was originall part of the BSD library but is now part of +the Unix standard. The BSD version had no return value, though. @end deftypefun There is one more function to modify the whole environment. This |