Viewing file:  sleep.c (2.38 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* sleep -- sleep for fractions of a second
*
* usage: sleep seconds[.fraction]
*/
#include "config.h"
#include "bashtypes.h"
#if defined (TIME_WITH_SYS_TIME)
# include <sys/time.h>
# include <time.h>
#else
# if defined (HAVE_SYS_TIME_H)
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if defined (HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <stdio.h>
#include "chartypes.h"
#include "shell.h"
#include "builtins.h"
#define RETURN(x) \
do { \
if (sp) *sp = sec; \
if (usp) *usp = usec; \
return (x); \
} while (0)
#if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT)
static int
fsleep(sec, usec)
long sec, usec;
{
struct timeval tv;
tv.tv_sec = sec;
tv.tv_usec = usec;
return select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
}
#else /* !HAVE_TIMEVAL || !HAVE_SELECT */
static int
fsleep(sec, usec)
long sec, usec;
{
if (usec >= 500000) /* round */
sec++;
return (sleep(sec));
}
#endif /* !HAVE_TIMEVAL || !HAVE_SELECT */
/*
* An incredibly simplistic floating point converter.
*/
static int multiplier[7] = { 1, 100000, 10000, 1000, 100, 10, 1 };
static int
convert(s, sp, usp)
char *s;
long *sp, *usp;
{
int n;
long sec, usec;
char *p;
sec = usec = 0;
#define DECIMAL '.'
for (p = s; p && *p; p++) {
if (*p == DECIMAL) /* decimal point */
break;
if (DIGIT(*p) == 0)
RETURN(0);
sec = (sec * 10) + (*p - '0');
}
if (*p == 0)
RETURN(1);
if (*p == DECIMAL)
p++;
/* Look for up to six digits past a decimal point. */
for (n = 0; n < 6 && p[n]; n++) {
if (DIGIT(p[n]) == 0)
RETURN(0);
usec = (usec * 10) + (p[n] - '0');
}
/* Now convert to millionths */
usec *= multiplier[n];
if (n == 6 && p[6] >= '5' && p[6] <= '9')
usec++; /* round up 1 */
RETURN(1);
}
int
sleep_builtin (list)
WORD_LIST *list;
{
long sec, usec;
if (list == 0) {
builtin_usage();
return(EX_USAGE);
}
if (*list->word->word == '-' || list->next) {
builtin_usage ();
return (EX_USAGE);
}
if (convert(list->word->word, &sec, &usec)) {
fsleep(sec, usec);
return(EXECUTION_SUCCESS);
}
builtin_error("%s: bad sleep interval", list->word->word);
return (EXECUTION_FAILURE);
}
static char *sleep_doc[] = {
"sleep suspends execution for a minimum of SECONDS[.FRACTION] seconds.",
(char *)NULL
};
struct builtin sleep_struct = {
"sleep",
sleep_builtin,
BUILTIN_ENABLED,
sleep_doc,
"sleep seconds[.fraction]",
0
};
|