/[autoconf]/autoconf/doc/autoconf.texi
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revision 1.766 by kryde, Wed Oct 15 00:06:53 2003 UTC revision 1.767 by kryde, Wed Oct 15 00:10:05 2003 UTC
# Line 3544  Did you know that, on some older hosts, Line 3544  Did you know that, on some older hosts,
3544  This is because @code{exit} predates @code{void}, and there was a long  This is because @code{exit} predates @code{void}, and there was a long
3545  tradition of it returning @code{int}.  tradition of it returning @code{int}.
3546    
3547    @item @code{putenv}
3548    @c @fuindex putenv
3549    @prindex @code{putenv}
3550    POSIX specifies that @code{putenv} puts the given string directly in
3551    @code{environ}, but some systems make a copy of it instead (eg.@:
3552    glibc 2.0, or BSD).  And when a copy is made, @code{unsetenv} might
3553    not free it, causing a memory leak (eg.@: FreeBSD 4).
3554    
3555    POSIX specifies that @code{putenv("FOO")} removes @samp{FOO} from the
3556    environment, but on some systems (eg.@: FreeBSD 4) this is not the
3557    case and instead @code{unsetenv} must be used.
3558    
3559    On MINGW, a call @code{putenv("FOO=")} removes @samp{FOO} from the
3560    environment, rather than inserting it with an empty value.
3561    
3562  @item @code{snprintf}  @item @code{snprintf}
3563  @c @fuindex snprintf  @c @fuindex snprintf
3564  @prindex @code{snprintf}  @prindex @code{snprintf}
# Line 3609  that are open.  For example, on Windows Line 3624  that are open.  For example, on Windows
3624  on DOS it could even lead to file system corruption, as the file might end  on DOS it could even lead to file system corruption, as the file might end
3625  up being written to after the OS has removed it.  up being written to after the OS has removed it.
3626    
3627    @item @code{unsetenv}
3628    @c @fuindex unsetenv
3629    @prindex @code{unsetenv}
3630    On MINGW, @code{unsetenv} is not available, but a variable @samp{FOO}
3631    can be removed with a call @code{putenv("FOO=")}, as described under
3632    @code{putenv} above.
3633    
3634  @item @code{va_copy}  @item @code{va_copy}
3635  @c @fuindex va_copy  @c @fuindex va_copy
3636  @prindex @code{va_copy}  @prindex @code{va_copy}

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