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| Commit | Line | Data |
|---|---|---|
| abbfd2f2 | 1 | #ifndef lint |
| 8fa6d94c | 2 | static char *sccsid = "@(#)wwiomux.c 3.7 84/01/16"; |
| abbfd2f2 EW |
3 | #endif |
| 4 | ||
| 5 | #include "ww.h" | |
| 8fa6d94c | 6 | #include <sys/time.h> |
| abbfd2f2 | 7 | |
| 8fa6d94c EW |
8 | /* |
| 9 | * Multiple window IO handler. | |
| 10 | */ | |
| 11 | wwiomux() | |
| abbfd2f2 | 12 | { |
| 8fa6d94c EW |
13 | register struct ww *w; |
| 14 | int imask; | |
| 15 | char dont_block; | |
| 16 | register char *p; | |
| 17 | register n; | |
| 18 | char c; | |
| 19 | static struct timeval tv = { 0, 0 }; | |
| abbfd2f2 | 20 | |
| 8fa6d94c EW |
21 | loop: |
| 22 | imask = 1; | |
| 23 | dont_block = 0; | |
| 24 | for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) { | |
| 25 | if (w->ww_pty < 0) | |
| 26 | continue; | |
| 27 | if (w->ww_obp + w->ww_obc < w->ww_obe) | |
| 28 | imask |= 1 << w->ww_pty; | |
| 29 | if (w->ww_obc != 0 && !w->ww_stopped) | |
| 30 | dont_block = 1; | |
| 31 | } | |
| 32 | if (!dont_block) { | |
| 33 | wwupdate(); | |
| 34 | wwflush(); | |
| 35 | } | |
| 36 | wwnselect++; | |
| 37 | n = select(wwdtablesize, &imask, (int *)0, (int *)0, | |
| 38 | dont_block ? &tv : (struct timeval *)0); | |
| 39 | if (n < 0) | |
| 40 | wwnselecte++; | |
| 41 | else if (imask & 1) { | |
| 42 | if (wwibc == 0) | |
| 43 | p = wwibp = wwib; | |
| 44 | else | |
| 45 | p = wwibp + wwibc; | |
| 46 | n = wwibe - p; | |
| 47 | wwnread++; | |
| 48 | if ((n = read(0, p, n)) > 0) { | |
| 49 | wwibc += n; | |
| 50 | wwnreadc += n; | |
| 51 | } else if (n == 0) | |
| 52 | wwnreadz++; | |
| 53 | else | |
| 54 | wwnreade++; | |
| 55 | } else if (imask != 0 || dont_block) { | |
| 56 | char first_time = 1; | |
| 57 | if (n == 0) | |
| 58 | wwnselectz++; | |
| 59 | for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) { | |
| 60 | if (w->ww_pty < 0) | |
| 61 | continue; | |
| 62 | if (imask & 1 << w->ww_pty) { | |
| 63 | wwnwread++; | |
| 64 | p = w->ww_obp + w->ww_obc; | |
| 65 | if (p == w->ww_ob) | |
| 66 | w->ww_obp++; | |
| 67 | else | |
| 68 | p--; | |
| 69 | c = *p; | |
| 70 | n = read(w->ww_pty, p, w->ww_obe - p); | |
| 71 | if (n < 0) { | |
| 72 | wwnwreade++; | |
| 73 | (void) close(w->ww_pty); | |
| 74 | w->ww_pty = -1; | |
| 75 | continue; | |
| 76 | } else if (n == 0) { | |
| 77 | wwnwreadz++; | |
| 78 | } else if (*p == TIOCPKT_DATA) { | |
| 79 | wwnwreadd++; | |
| 80 | wwnwreadc += n - 1; | |
| 81 | w->ww_obc += n - 1; | |
| 82 | } else { | |
| 83 | wwnwreadp++; | |
| 84 | if (*p & TIOCPKT_STOP) | |
| 85 | w->ww_stopped = 1; | |
| 86 | if (*p & TIOCPKT_START) | |
| 87 | w->ww_stopped = 0; | |
| 88 | if (*p & TIOCPKT_FLUSHWRITE) { | |
| 89 | w->ww_obp = w->ww_ob; | |
| 90 | w->ww_obc = 0; | |
| 91 | w->ww_stopped = 0; | |
| 92 | } | |
| 93 | } | |
| 94 | *p = c; | |
| 95 | } | |
| 96 | if (first_time && w->ww_obc != 0 && !w->ww_stopped) { | |
| 97 | first_time = 0; | |
| 98 | /* XXX */ | |
| 99 | n = wwwrite(w, w->ww_obp, MIN(w->ww_obc, 50)); | |
| 100 | if (w->ww_obc -= n) | |
| 101 | w->ww_obp += n; | |
| 102 | else | |
| 103 | w->ww_obp = w->ww_ob; | |
| 104 | } | |
| abbfd2f2 | 105 | } |
| 8fa6d94c | 106 | } |
| abbfd2f2 | 107 | } |