diff options
Diffstat (limited to 'Src/compat.c')
| -rw-r--r-- | Src/compat.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/Src/compat.c b/Src/compat.c index 86611a727..126d4bd4a 100644 --- a/Src/compat.c +++ b/Src/compat.c @@ -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) { + 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; + } + } - if (openmax < 1) - return OPEN_MAX; - else - return openmax; + return (max_zsh_fd > openmax) ? max_zsh_fd : openmax; } #endif |