diff options
Diffstat (limited to 'toys/pending')
| -rw-r--r-- | toys/pending/watch.c | 219 |
1 files changed, 175 insertions, 44 deletions
diff --git a/toys/pending/watch.c b/toys/pending/watch.c index 3c0a0858..f360ac7c 100644 --- a/toys/pending/watch.c +++ b/toys/pending/watch.c @@ -3,71 +3,202 @@ * Copyright 2013 Sandeep Sharma <sandeep.jack2756@gmail.com> * Copyright 2013 Kyungwan Han <asura321@gmail.com> * -USE_WATCH(NEWTOY(watch, "^<1n#<0=2teb", TOYFLAG_USR|TOYFLAG_BIN)) + * No standard. See http://man7.org/linux/man-pages/man1/watch.1.html + * + * TODO: add +USE_WATCH(NEWTOY(watch, "^<1n#<100=2000tebx", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_LOCALE)) config WATCH bool "watch" default n help - usage: watch [-n SEC] [-t] PROG ARGS + usage: watch [-teb] [-n SEC] PROG ARGS - Run PROG periodically + Run PROG every -n seconds, showing output. Hit q to quit. -n Loop period in seconds (default 2) -t Don't print header - -e Freeze updates on command error, and exit after enter. + -e Exit on error -b Beep on command error + -x Exec command directly (vs "sh -c") */ + #define FOR_watch #include "toys.h" GLOBALS( - int interval; + int n; + + pid_t pid, oldpid; ) -void watch_main(void) +void start_redraw(unsigned *width, unsigned *height) { - int i = 0, hlen; - time_t t; - unsigned width = 80, len = sizeof("Www Mmm dd hh:mm:ss yyyy") - 1 ; - char *header, *cmd = *toys.optargs; - int retval; - - while (toys.optargs[++i]) - { - char * oldcmd = cmd; - cmd = xmprintf("%s %s", oldcmd, toys.optargs[i]); - if (CFG_TOYBOX_FREE) free(oldcmd); + // If never signaled, do raw mode setup. + if (!toys.signal) { + *width = 80; + *height = 25; + set_terminal(0, 1, 0, 0); + sigatexit(tty_sigreset); + xsignal(SIGWINCH, generic_signal); } - header = xmprintf("Every %us: %s", TT.interval, cmd); - hlen = strlen(header); - - while(1) { - xprintf("\033[H\033[J"); - if (!(toys.optflags & FLAG_t)) { - terminal_size(&width, NULL); - if (!width) width = 80; //on serial it may return 0. - time(&t); - if (width > (hlen + len)) xprintf("%s", header); - if (width >= len) - xprintf("%*s\n",width + ((width > (hlen + len))?-hlen:0) + 1, ctime(&t)); - else - xprintf("\n\n"); - } - fflush(NULL); //making sure the screen is clear - retval = system(cmd); - if ((toys.optflags & FLAG_b) && retval) - xprintf("\007"); - if ((toys.optflags & FLAG_e) && retval) { - xprintf("command exit with non-zero status, press enter to exit\n"); - getchar(); - break; + if (toys.signal != -1) { + toys.signal = -1; + terminal_probesize(width, height); + } + xprintf("\033[H\033[J"); +} + +// When a child process exits, stop tracking them. Handle errors for -be +void watch_child(int sig) +{ + int status; + pid_t pid = wait(&status); + + status = WIFEXITED(status) ? WEXITSTATUS(status) : WTERMSIG(status)+127; + if (status) { + // TODO should this be beep()? + if (toys.optflags&FLAG_b) putchar('\b'); + if (toys.optflags&FLAG_e) { + printf("Exit status %d\r\n", status); + tty_reset(); + _exit(status); } - sleep(TT.interval); } - if (CFG_TOYBOX_FREE){ - free(header); - if (cmd != *toys.optargs) free(cmd); + if (pid == TT.oldpid) TT.oldpid = 0; + else if (pid == TT.pid) TT.pid = 0; +} + +// Return early for low-ascii characters with special behavior, +// discard remaining low ascii, escape other unprintable chars normally +int watch_escape(FILE *out, int cols, int wc) +{ + if (wc==27 || (wc>=7 && wc<=13)) return -1; + if (wc < 32) return 0; + + return crunch_escape(out, cols, wc); +} + +void watch_main(void) +{ + char *cmdv[] = {"/bin/sh", "-c", 0, 0}, *cmd, *ss; + long long now, then = millitime(); + unsigned width, height, xx, yy, i, cmdlen, len, active; + struct pollfd pfd[2]; + pid_t pid = 0; + int fds[2], cc; + + // Assemble header line in cmd, cmdlen, and cmdv + for (i = TT.n%1000, len = i ? 3 : 1; i && !(i%10); i /= 10) len--; + len = sprintf(toybuf, "Every %u.%0*us:", TT.n/1000, len, i)+1; + cmdlen = len; + for (i = 0; toys.optargs[i]; i++) len += strlen(toys.optargs[i])+1; + ss = stpcpy(cmd = xmalloc(len), toybuf); + cmdv[2] = cmd+cmdlen; + for (i = 0; toys.optargs[i]; i++) ss += sprintf(ss, " %s",toys.optargs[i]); + cmdlen = ss-cmd; + + // Need to poll on process output and stdin + memset(pfd, 0, sizeof(pfd)); + pfd[0].events = pfd[1].events = POLLIN; + + xsignal_flags(SIGCHLD, watch_child, SA_RESTART|SA_NOCLDSTOP); + + for (;;) { + + // Time for a new period? + if ((now = millitime())>=then) { + + // Incrementing then instead of adding offset to now avoids drift, + // loop is in case we got suspend/resumed and need to skip periods + while ((then += TT.n)<=now); + start_redraw(&width, &height); + + // redraw the header + if (!(toys.optflags&FLAG_t)) { + time_t t = time(0); + int pad, ctimelen; + + // Get and measure time string, trimming gratuitous \n + ctimelen = strlen(ss = ctime(&t)); + if (ss[ctimelen-1]=='\n') ss[--ctimelen] = 0; + + // print cmdline, then * or ' ' (showing truncation), then ctime + pad = width-++ctimelen; + if (pad>0) draw_trim(cmd, -pad, pad); + printf("%c", pad<cmdlen ? '*' : ' '); + if (width) xputs(ss+(width>ctimelen ? 0 : width-1)); + if (yy>=3) xprintf("\r\n"); + xx = 0; + yy = 2; + } + + // If child didn't exit, send TERM signal to current and KILL to previous + if (TT.oldpid>0) kill(TT.oldpid, SIGKILL); + if (TT.pid>0) kill(TT.pid, SIGTERM); + TT.oldpid = pid; + if (fds[0]>0) close(fds[0]); + if (fds[1]>0) close(fds[1]); + + // Spawn child process + memset(fds, 0, sizeof(fds)); + TT.pid = xpopen_both((toys.optflags&FLAG_x) ? toys.optargs : cmdv, fds); + pfd[1].fd = fds[1]; + active = 1; + } + + // Fetch data from child process or keyboard, with timeout + len = 0; + xpoll(pfd, 1+(active && yy<height), then-now); + if (pfd[0].revents&POLLIN) { + memset(toybuf, 0, 16); + cc = scan_key_getsize(toybuf, 0, &width, &height); + // TODO: ctrl-Z suspend + // TODO if (cc == -3) redraw(); + if (cc == 3 || tolower(cc) == 'q') xexit(); + } + if (pfd[0].revents&POLLHUP) xexit(); + if (active) { + if (pfd[1].revents&POLLIN) len = read(fds[1], toybuf, sizeof(toybuf)-1); + if (pfd[1].revents&POLLHUP) active = 0; + } + + // Measure output, trim to available display area. Escape low ascii so + // we don't have to try to parse ansi escapes. TODO: parse ansi escapes. + if (len<1) continue; + ss = toybuf; + toybuf[len] = 0; + while (yy<height) { + if (xx==width) { + xx = 0; + if (++yy>=height) break; + } + xx += crunch_str(&ss, width-xx, stdout, 0, watch_escape); + if (xx==width) { + xx = 0; + if (++yy>=height) break; + continue; + } + + if (ss-toybuf==len || *ss>27) break; + cc = *ss++; + if (cc==27) continue; // TODO + + // Handle BEL BS HT LF VT FF CR + if (cc>=10 && cc<=12) { + if (++yy>=height) break; + + if (cc=='\n') putchar('\r'), xx = 0; + } + putchar(cc); + if (cc=='\b' && xx) xx--; + else if (cc=='\t') { + xx = (xx|7)+1; + if (xx>width-1) xx = width-1; + } + } } + + if (CFG_TOYBOX_FREE) free(cmd); } |