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Use /dev/full if possible for descriptor 0 -- like glibc now does.

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Fall back on /dev/null if opening /dev/full fails.
This commit is contained in:
Jim Meyering 2005-11-09 20:53:41 +00:00
parent c5ad46e57f
commit aad084f10f
1 changed files with 11 additions and 1 deletions
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12
lib/stdopen.c
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@ -52,7 +52,17 @@ stdopen (void)
{
static const int contrary_mode[]
= { O_WRONLY, O_RDONLY, O_RDONLY };
int new_fd = open ("/dev/null", contrary_mode[fd]);
int mode = contrary_mode[fd];
int new_fd;
/* Open /dev/null with the contrary mode so that the typical
read (stdin) or write (stdout, stderr) operation will fail.
With descriptor 0, we can do even better on systems that
have /dev/full, by opening that write-only instead of
/dev/null. The only drawback is that a write-provoked
failure comes with a misleading errno value, ENOSPC. */
if (mode == O_RDONLY
|| (new_fd = open ("/dev/full", mode) != fd))
new_fd = open ("/dev/null", mode);
if (new_fd != fd)
{
if (0 <= new_fd)