diff options
Diffstat (limited to 'src/common/compat.c')
| -rw-r--r-- | src/common/compat.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/src/common/compat.c b/src/common/compat.c index 27a3ece5ba..10c43416bf 100644 --- a/src/common/compat.c +++ b/src/common/compat.c @@ -1603,15 +1603,23 @@ get_max_sockets(void) * tell Tor it's allowed to use. */ #define ULIMIT_BUFFER 32 /* keep 32 extra fd's beyond ConnLimit_ */ -/** Learn the maximum allowed number of file descriptors, and tell the system - * we want to use up to that number. (Some systems have a low soft limit, and - * let us set it higher.) +/** Learn the maximum allowed number of file descriptors, and tell the + * system we want to use up to that number. (Some systems have a low soft + * limit, and let us set it higher.) We compute this by finding the largest + * number that we can use. * - * We compute this by finding the largest number that we can use. - * If we can't find a number greater than or equal to <b>limit</b>, - * then we fail: return -1. + * If the limit is below the reserved file descriptor value (ULIMIT_BUFFER), + * return -1 and <b>max_out</b> is untouched. * - * Otherwise, return 0 and store the maximum we found inside <b>max_out</b>.*/ + * If we can't find a number greater than or equal to <b>limit</b>, then we + * fail by returning -1 and <b>max_out</b> is untouched. + * + * If we are unable to set the limit value because of setrlimit() failing, + * return -1 and <b>max_out</b> is set to the current maximum value returned + * by getrlimit(). + * + * Otherwise, return 0 and store the maximum we found inside <b>max_out</b> + * and set <b>max_sockets</b> with that value as well.*/ int set_max_file_descriptors(rlim_t limit, int *max_out) { @@ -1668,7 +1676,7 @@ set_max_file_descriptors(rlim_t limit, int *max_out) } /* Set the current limit value so if the attempt to set the limit to the * max fails at least we'll have a valid value of maximum sockets. */ - max_sockets = (int)rlim.rlim_cur - ULIMIT_BUFFER; + *max_out = max_sockets = (int)rlim.rlim_cur - ULIMIT_BUFFER; rlim.rlim_cur = rlim.rlim_max; if (setrlimit(RLIMIT_NOFILE, &rlim) != 0) { |