projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 963ce42e MK |
1 | #ifndef lint |
| 2 | static char sccsid[] = "@(#)ctl_transact.c 1.2 (Berkeley) %G%"; | |
| 3 | #endif | |
| 4 | ||
| 0328946e MK |
5 | #include "talk_ctl.h" |
| 6 | #include <sys/time.h> | |
| 7 | ||
| 963ce42e | 8 | #define CTL_WAIT 2 /* time to wait for a response, in seconds */ |
| 0328946e | 9 | |
| 963ce42e MK |
10 | /* |
| 11 | * SOCKDGRAM is unreliable, so we must repeat messages if we have | |
| 12 | * not recieved an acknowledgement within a reasonable amount | |
| 13 | * of time | |
| 14 | */ | |
| 0328946e | 15 | ctl_transact(target, msg, type, response) |
| 963ce42e MK |
16 | struct in_addr target; |
| 17 | CTL_MSG msg; | |
| 18 | int type; | |
| 19 | CTL_RESPONSE *response; | |
| 0328946e | 20 | { |
| 963ce42e MK |
21 | struct sockaddr junk; |
| 22 | int read_mask; | |
| 23 | int ctl_mask; | |
| 24 | int nready; | |
| 25 | int cc; | |
| 26 | int junk_size; | |
| 27 | struct timeval wait; | |
| 28 | ||
| 29 | wait.tv_sec = CTL_WAIT; | |
| 30 | wait.tv_usec = 0; | |
| 31 | msg.type = type; | |
| 32 | daemon_addr.sin_addr = target; | |
| 33 | daemon_addr.sin_port = daemon_port; | |
| 34 | ctl_mask = 1 << ctl_sockt; | |
| 0328946e MK |
35 | |
| 36 | /* | |
| 37 | * keep sending the message until a response of the right | |
| 38 | * type is obtained | |
| 39 | */ | |
| 0328946e | 40 | do { |
| 963ce42e MK |
41 | /* keep sending the message until a response is obtained */ |
| 42 | do { | |
| 43 | cc = sendto(ctl_sockt, (char *)&msg, sizeof(CTL_MSG), 0, | |
| 44 | &daemon_addr, sizeof(daemon_addr)); | |
| 45 | if (cc != sizeof(CTL_MSG)) { | |
| 46 | if (errno == EINTR) | |
| 47 | continue; | |
| 48 | p_error("Error on write to talk daemon"); | |
| 49 | } | |
| 50 | read_mask = ctl_mask; | |
| 51 | nready = select(32, &read_mask, 0, 0, &wait); | |
| 52 | while (nready < 0) { | |
| 53 | if (errno == EINTR) | |
| 54 | continue; | |
| 55 | p_error("Error waiting for daemon response"); | |
| 56 | } | |
| 57 | } while (nready == 0); | |
| 58 | /* keep reading while there are queued messages | |
| 59 | (this is not necessary, it just saves extra | |
| 60 | request/acknowledgements being sent) | |
| 61 | */ | |
| 62 | do { | |
| 63 | junk_size = sizeof(junk); | |
| 64 | cc = recvfrom(ctl_sockt, (char *)response, | |
| 65 | sizeof (CTL_RESPONSE), 0, &junk, &junk_size); | |
| 66 | if (cc < 0) { | |
| 67 | if (errno == EINTR) | |
| 68 | continue; | |
| 69 | p_error("Error on read from talk daemon"); | |
| 70 | } | |
| 71 | read_mask = ctl_mask; | |
| 72 | /* an immediate poll */ | |
| 73 | timerclear(&wait); | |
| 74 | nready = select(32, &read_mask, 0, 0, &wait); | |
| 75 | } while (nready > 0 && response->type != type); | |
| 76 | } while (response->type != type); | |
| 0328946e | 77 | } |