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-rw-r--r--toys/pending/watch.c219
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);
}