diff options
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/emulator/drivers/common/inet_drv.c | 42 |
1 files changed, 28 insertions, 14 deletions
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c index 49da0ef118..b491242aea 100644 --- a/erts/emulator/drivers/common/inet_drv.c +++ b/erts/emulator/drivers/common/inet_drv.c @@ -5050,9 +5050,17 @@ static STATUS wrap_sockopt(STATUS (*function)() /* Yep, no parameter } #endif +/* Per H @ Tail-f: The original code here had problems that possibly + only occur if you abuse it for non-INET sockets, but anyway: + a) If the getsockopt for SO_PRIORITY or IP_TOS failed, the actual + requested setsockopt was never even attempted. + b) If {get,set}sockopt for one of IP_TOS and SO_PRIORITY failed, + but ditto for the other worked and that was actually the requested + option, failure was still reported to erlang. */ + #if defined(IP_TOS) && defined(SOL_IP) && defined(SO_PRIORITY) static int setopt_prio_tos_trick - (int fd, int proto, int type, char* arg_ptr, int arg_sz) + (int fd, int proto, int type, char* arg_ptr, int arg_sz, int propagate) { /* The relations between SO_PRIORITY, TOS and other options is not what you (or at least I) would expect...: @@ -5065,6 +5073,8 @@ static int setopt_prio_tos_trick int tmp_ival_prio; int tmp_ival_tos; int res; + int res_prio; + int res_tos; #ifdef HAVE_SOCKLEN_T socklen_t #else @@ -5073,31 +5083,35 @@ static int setopt_prio_tos_trick tmp_arg_sz_prio = sizeof(tmp_ival_prio), tmp_arg_sz_tos = sizeof(tmp_ival_tos); - res = sock_getopt(fd, SOL_SOCKET, SO_PRIORITY, + res_prio = sock_getopt(fd, SOL_SOCKET, SO_PRIORITY, (char *) &tmp_ival_prio, &tmp_arg_sz_prio); - if (res == 0) { - res = sock_getopt(fd, SOL_IP, IP_TOS, + res_tos = sock_getopt(fd, SOL_IP, IP_TOS, (char *) &tmp_ival_tos, &tmp_arg_sz_tos); - if (res == 0) { res = sock_setopt(fd, proto, type, arg_ptr, arg_sz); if (res == 0) { if (type != SO_PRIORITY) { - if (type != IP_TOS) { - res = sock_setopt(fd, + if (type != IP_TOS && res_tos == 0) { + res_tos = sock_setopt(fd, SOL_IP, IP_TOS, (char *) &tmp_ival_tos, tmp_arg_sz_tos); + if (propagate) + res = res_tos; } - if (res == 0) { - res = sock_setopt(fd, + if (res == 0 && res_prio == 0) { + res_prio = sock_setopt(fd, SOL_SOCKET, SO_PRIORITY, (char *) &tmp_ival_prio, tmp_arg_sz_prio); - if (res != 0 && sock_errno() == EPERM) { - res = 0; - } + if (propagate) { + /* Some kernels set a SO_PRIORITY by default that you are not permitted to reset, + silently ignore this error condition */ + if (res_prio != 0 && sock_errno() == EPERM) { + res = 0; + } else { + res = res_prio; } } } @@ -5443,7 +5457,7 @@ static int inet_set_opts(inet_descriptor* desc, char* ptr, int len) return -1; } #if defined(IP_TOS) && defined(SOL_IP) && defined(SO_PRIORITY) - res = setopt_prio_tos_trick (desc->s, proto, type, arg_ptr, arg_sz); + res = setopt_prio_tos_trick (desc->s, proto, type, arg_ptr, arg_sz, propagate); #else res = sock_setopt (desc->s, proto, type, arg_ptr, arg_sz); #endif @@ -5973,7 +5987,7 @@ static int sctp_set_opts(inet_descriptor* desc, char* ptr, int len) return -1; } #if defined(IP_TOS) && defined(SOL_IP) && defined(SO_PRIORITY) - res = setopt_prio_tos_trick (desc->s, proto, type, arg_ptr, arg_sz); + res = setopt_prio_tos_trick (desc->s, proto, type, arg_ptr, arg_sz, 1); #else res = sock_setopt (desc->s, proto, type, arg_ptr, arg_sz); #endif |