1 /* watch.c - Execute a program periodically 2 * 3 * Copyright 2013 Sandeep Sharma <sandeep.jack2756 (at) gmail.com> 4 * Copyright 2013 Kyungwan Han <asura321 (at) gmail.com> 5 * 6 USE_WATCH(NEWTOY(watch, "^<1n#<0=2te", TOYFLAG_USR|TOYFLAG_BIN)) 7 8 config WATCH 9 bool "watch" 10 default n 11 help 12 usage: watch [-n SEC] [-t] PROG ARGS 13 14 Run PROG periodically 15 16 -n Loop period in seconds (default 2) 17 -t Don't print header 18 -e Freeze updates on command error, and exit after enter. 19 */ 20 #define FOR_watch 21 #include "toys.h" 22 23 GLOBALS( 24 int interval; 25 ) 26 27 void watch_main(void) 28 { 29 int i = 0, hlen; 30 time_t t; 31 unsigned width = 80, len = sizeof("Www Mmm dd hh:mm:ss yyyy") - 1 ; 32 char *header, *cmd = *toys.optargs; 33 int retval; 34 35 while(toys.optargs[++i]) 36 { 37 char * oldcmd = cmd; 38 cmd = xmprintf("%s %s", oldcmd, toys.optargs[i]); 39 if (CFG_TOYBOX_FREE) free(oldcmd); 40 } 41 header = xmprintf("Every %us: %s", TT.interval, cmd); 42 hlen = strlen(header); 43 44 while(1) { 45 xprintf("\033[H\033[J"); 46 if(!(toys.optflags & FLAG_t)) { 47 terminal_size(&width, NULL); 48 if (!width) width = 80; //on serial it may return 0. 49 time(&t); 50 if (width > (hlen + len)) xprintf("%s", header); 51 if(width >= len) 52 xprintf("%*s\n",width + ((width > (hlen + len))?-hlen:0) + 1, ctime(&t)); 53 else 54 xprintf("\n\n"); 55 } 56 fflush(NULL); //making sure the screen is clear 57 retval = system(cmd); 58 if ((toys.optflags & FLAG_e) && retval){ 59 xprintf("command exit with non-zero status, press enter to exit\n"); 60 getchar(); 61 break; 62 } 63 sleep(TT.interval); 64 } 65 66 if (CFG_TOYBOX_FREE){ 67 free(header); 68 if (cmd != *toys.optargs) free(cmd); 69 } 70 } 71
