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/*
* sleep -- sleep for fractions of a second
*
* usage: sleep seconds[.fraction]
*
* as an extension, we support the GNU time interval format (2m20s)
*/
/*
Copyright (C) 1999-2021 Free Software Foundation, Inc.
This file is part of GNU Bash.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#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 "loadables.h"
#define S_SEC 1
#define S_MIN (60*S_SEC)
#define S_HOUR (60*S_MIN)
#define S_DAY (24*S_HOUR)
static int
parse_gnutimefmt (char *string, long *sp, long *up)
{
int c, r;
char *s, *ep;
long tsec, tusec, accumsec, accumusec, t;
int mult;
tsec = tusec = 0;
accumsec = accumusec = 0;
mult = 1;
for (s = string; s && *s; s++) {
r = uconvert(s, &accumsec, &accumusec, &ep);
if (r == 0 && *ep == 0)
return r;
c = *ep;
mult = 1;
switch (c) {
case '\0':
case 's':
mult = S_SEC;
break;
case 'm':
mult = S_MIN;
break;
case 'h':
mult = S_HOUR;
break;
case 'd':
mult = S_DAY;
break;
default:
return 0;
}
/* multiply the accumulated value by the multiplier */
t = accumusec * mult;
accumsec = accumsec * mult + (t / 1000000);
accumusec = t % 1000000;
/* add to running total */
tsec += accumsec;
tusec += accumusec;
if (tusec >= 1000000) {
tsec++;
tusec -= 1000000;
}
/* reset and continue */
accumsec = accumusec = 0;
mult = 1;
if (c == 0)
break;
s = ep;
}
if (sp)
*sp = tsec;
if (up)
*up = tusec;
return 1;
}
int
sleep_builtin (WORD_LIST *list)
{
long sec, usec;
char *ep;
int r, mul;
time_t t;
if (list == 0) {
builtin_usage();
return(EX_USAGE);
}
/* Skip over `--' */
if (list->word && ISOPTION (list->word->word, '-'))
list = list->next;
if (*list->word->word == '-' || list->next) {
builtin_usage ();
return (EX_USAGE);
}
r = uconvert(list->word->word, &sec, &usec, &ep);
/*
* Maybe postprocess conversion failures here based on EP
*
* A heuristic: if the conversion failed, but the argument appears to
* contain a GNU-like interval specifier (e.g. "1m30s"), try to parse
* it. If we can't, return the right exit code to tell
* execute_builtin to try and execute a disk command instead.
*/
if (r == 0 && (strchr ("dhms", *ep) || strpbrk (list->word->word, "dhms")))
r = parse_gnutimefmt (list->word->word, &sec, &usec);
if (r) {
fsleep(sec, usec);
QUIT;
return(EXECUTION_SUCCESS);
}
builtin_error("%s: bad sleep interval", list->word->word);
return (EXECUTION_FAILURE);
}
static char *sleep_doc[] = {
"Suspend execution for specified period.",
""
"sleep suspends execution for a minimum of SECONDS[.FRACTION] seconds.",
"As an extension, sleep accepts GNU-style time intervals (e.g., 2m30s).",
(char *)NULL
};
struct builtin sleep_struct = {
"sleep",
sleep_builtin,
BUILTIN_ENABLED,
sleep_doc,
"sleep seconds[.fraction]",
0
};
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