Apple-2gs-SW/hush
1
0
Fork 0
mirror of https://github.com/sheumann/hush.git synced 2024-12-27 01:32:08 +00:00
Code Issues Projects Releases Wiki Activity

watch: execute command thru shell, not fork/exec. Other fixes

Browse Source
This commit is contained in:
Denis Vlasenko 2006-10-20 23:48:30 +00:00
parent 9bff26cccb
commit 8d73c35916
2 changed files with 54 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
coreutils/watch.c
View File

@ -13,45 +13,66 @@
#include "busybox.h"
// procps 2.0.18:
// watch [-d] [-n seconds]
// [--differences[=cumulative]] [--interval=seconds] command
//
// procps-3.2.3:
// watch [-dt] [-n seconds]
// [--differences[=cumulative]] [--interval=seconds] [--no-title] command
//
// (procps 3.x and procps 2.x are forks, not newer/older versions of the same)
int watch_main(int argc, char **argv)
{
int width, len;
unsigned opt;
unsigned period = 2;
char **watched_argv, *header;
unsigned cmdlen = 1; // 1 for terminal NUL
char *header = NULL;
char *cmd;
char *tmp;
char **p;
if (argc < 2) bb_show_usage();
opt_complementary = "-1"; // at least one param please
opt = getopt32(argc, argv, "+dtn:", &tmp);
//if (opt & 0x1) // -d (ignore)
//if (opt & 0x2) // -t
if (opt & 0x4) period = xatou(tmp);
argv += optind;
get_terminal_width_height(STDOUT_FILENO, &width, 0);
header = xzalloc(width--);
/* don't use getopt, because it permutes the arguments */
++argv;
if ((argc > 3) && argv[0][0] == '-' && argv[0][1] == 'n') {
period = xatou(argv[1]);
argv += 2;
p = argv;
while (*p)
cmdlen += strlen(*p++) + 1;
tmp = cmd = xmalloc(cmdlen);
while (*argv) {
tmp += sprintf(tmp, " %s", *argv);
argv++;
}
watched_argv = argv;
/* create header */
len = snprintf(header, width, "Every %ds:", period);
while (*argv && len<width)
snprintf(header+len, width-len, " %s", *(argv++));
cmd++; // skip initial space
while (1) {
char *thyme;
time_t t;
printf("\033[H\033[J");
if (!(opt & 0x2)) { // no -t
int width, len;
char *thyme;
time_t t;
time(&t);
thyme = ctime(&t);
len = strlen(thyme);
if (len < width)
header[width-len] = 0;
bb_printf("\033[H\033[J%s %s\n", header, thyme);
waitpid(xspawn(watched_argv),0,0);
get_terminal_width_height(STDOUT_FILENO, &width, 0);
header = xrealloc(header, width--);
// We pad with spaces entire length
snprintf(header, width, "Every %ds: %-*s", period, width, cmd);
time(&t);
thyme = ctime(&t);
len = strlen(thyme);
if (len < width)
strcpy(header + width - len, thyme);
puts(header);
}
fflush(stdout);
// TODO: 'real' watch pipes cmd's output to itself
// and does not allow it to overflow the screen
// (taking into account linewrap!)
system(cmd);
sleep(period);
}
if (ENABLE_FEATURE_CLEAN_UP)
free(header);
}

7
include/usage.h
View File

@ -3296,11 +3296,12 @@ USE_FEATURE_START_STOP_DAEMON_FANCY( \
"\t-a\tLock all VTs"
#define watch_trivial_usage \
"[-n <seconds>] COMMAND..."
"[-n <seconds>] [-t] COMMAND..."
#define watch_full_usage \
"Executes a program periodically.\n" \
"Executes a program periodically\n\n" \
"Options:\n" \
"\t-n\tLoop period in seconds - default is 2"
"\t-n\tLoop period in seconds - default is 2\n"
"\t-t\tDon't print header"
#define watch_example_usage \
"$ watch date\n" \
"Mon Dec 17 10:31:40 GMT 2000\n" \