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16094: zopenmax() need only return the highest-numbered open descriptor

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This commit is contained in:
Bart Schaefer 2001-11-03 23:39:11 +00:00
parent d98a67c569
commit c43a6be917
1 changed files with 25 additions and 5 deletions
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30
Src/compat.c
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@ -198,12 +198,32 @@ zpathmax(char *dir)
mod_export long
zopenmax(void)
{
long openmax = sysconf(_SC_OPEN_MAX);
static long openmax = 0;
if (openmax < 1)
return OPEN_MAX;
else
return openmax;
if (openmax < 1) {
if ((openmax = sysconf(_SC_OPEN_MAX)) < 1) {
openmax = OPEN_MAX;
} else if (openmax > OPEN_MAX) {
/* On some systems, "limit descriptors unlimited" or the *
* equivalent will set openmax to a huge number. Unless *
* there actually is a file descriptor > OPEN_MAX already *
* open, nothing in zsh requires the true maximum, and in *
* fact it causes inefficiency elsewhere if we report it. *
* So, report the maximum of OPEN_MAX or the largest open *
* descriptor (is there a better way to find that?). */
long i, j = OPEN_MAX;
for (i = j; i < openmax; i += (errno != EINTR)) {
errno = 0;
if (fcntl(i, F_GETFL, 0) < 0 &&
(errno == EBADF || errno == EINTR))
continue;
j = i;
}
openmax = j;
}
}
return (max_zsh_fd > openmax) ? max_zsh_fd : openmax;
}
#endif