path: root/coreutils/sleep.c (plain)
blob: ad2d6b526eaedb3f994a2b0a7731c0a98119800c

1	/* vi: set sw=4 ts=4: */
2	/*
3	* sleep implementation for busybox
4	*
5	* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
8	*/
9	/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
10	*
11	* Rewritten to do proper arg and error checking.
12	* Also, added a 'fancy' configuration to accept multiple args with
13	* time suffixes for seconds, minutes, hours, and days.
14	*/
15	//config:config SLEEP
16	//config: bool "sleep"
17	//config: default y
18	//config: help
19	//config: sleep is used to pause for a specified number of seconds.
20	//config: It comes in 3 versions:
21	//config: - small: takes one integer parameter
22	//config: - fancy: takes multiple integer arguments with suffixes:
23	//config: sleep 1d 2h 3m 15s
24	//config: - fancy with fractional numbers:
25	//config: sleep 2.3s 4.5h sleeps for 16202.3 seconds
26	//config: Last one is "the most compatible" with coreutils sleep,
27	//config: but it adds around 1k of code.
28	//config:
29	//config:config FEATURE_FANCY_SLEEP
30	//config: bool "Enable multiple arguments and s/m/h/d suffixes"
31	//config: default y
32	//config: depends on SLEEP
33	//config: help
34	//config: Allow sleep to pause for specified minutes, hours, and days.
35	//config:
36	//config:config FEATURE_FLOAT_SLEEP
37	//config: bool "Enable fractional arguments"
38	//config: default y
39	//config: depends on FEATURE_FANCY_SLEEP
40	//config: help
41	//config: Allow for fractional numeric parameters.
42
43	/* Do not make this applet NOFORK. It breaks ^C-ing of pauses in shells */
44	//applet:IF_SLEEP(APPLET(sleep, BB_DIR_BIN, BB_SUID_DROP))
45
46	//kbuild:lib-$(CONFIG_SLEEP) += sleep.o
47
48	/* BB_AUDIT SUSv3 compliant */
49	/* BB_AUDIT GNU issues -- fancy version matches except args must be ints. */
50	/* http://www.opengroup.org/onlinepubs/007904975/utilities/sleep.html */
51
52	//usage:#define sleep_trivial_usage
53	//usage: IF_FEATURE_FANCY_SLEEP("[") "N" IF_FEATURE_FANCY_SLEEP("]...")
54	//usage:#define sleep_full_usage "\n\n"
55	//usage: IF_NOT_FEATURE_FANCY_SLEEP("Pause for N seconds")
56	//usage: IF_FEATURE_FANCY_SLEEP(
57	//usage: "Pause for a time equal to the total of the args given, where each arg can\n"
58	//usage: "have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays")
59	//usage:
60	//usage:#define sleep_example_usage
61	//usage: "$ sleep 2\n"
62	//usage: "[2 second delay results]\n"
63	//usage: IF_FEATURE_FANCY_SLEEP(
64	//usage: "$ sleep 1d 3h 22m 8s\n"
65	//usage: "[98528 second delay results]\n")
66
67	#include "libbb.h"
68
69	#if ENABLE_FEATURE_FANCY_SLEEP || ENABLE_FEATURE_FLOAT_SLEEP
70	static const struct suffix_mult sfx[] = {
71	{ "s", 1 },
72	{ "m", 60 },
73	{ "h", 60*60 },
74	{ "d", 24*60*60 },
75	{ "", 0 }
76	};
77	#endif
78
79	int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
80	int sleep_main(int argc UNUSED_PARAM, char **argv)
81	{
82	#if ENABLE_FEATURE_FLOAT_SLEEP
83	double duration;
84	struct timespec ts;
85	#else
86	unsigned duration;
87	#endif
88
89	++argv;
90	if (!*argv)
91	bb_show_usage();
92
93	#if ENABLE_FEATURE_FLOAT_SLEEP
94
95	# if ENABLE_LOCALE_SUPPORT
96	/* undo busybox.c setlocale */
97	setlocale(LC_NUMERIC, "C");
98	# endif
99	duration = 0;
100	do {
101	char *arg = *argv;
102	if (strchr(arg, '.')) {
103	double d;
104	char *pp;
105	int len = strspn(arg, "0123456789.");
106	char sv = arg[len];
107	arg[len] = '\0';
108	errno = 0;
109	d = strtod(arg, &pp);
110	if (errno || *pp)
111	bb_show_usage();
112	arg += len;
113	*arg-- = sv;
114	sv = *arg;
115	*arg = '1';
116	duration += d * xatoul_sfx(arg, sfx);
117	*arg = sv;
118	} else {
119	duration += xatoul_sfx(arg, sfx);
120	}
121	} while (*++argv);
122
123	ts.tv_sec = MAXINT(typeof(ts.tv_sec));
124	ts.tv_nsec = 0;
125	if (duration >= 0 && duration < ts.tv_sec) {
126	ts.tv_sec = duration;
127	ts.tv_nsec = (duration - ts.tv_sec) * 1000000000;
128	}
129	do {
130	errno = 0;
131	nanosleep(&ts, &ts);
132	} while (errno == EINTR);
133
134	#elif ENABLE_FEATURE_FANCY_SLEEP
135
136	duration = 0;
137	do {
138	duration += xatou_range_sfx(*argv, 0, UINT_MAX - duration, sfx);
139	} while (*++argv);
140	sleep(duration);
141
142	#else /* simple */
143
144	duration = xatou(*argv);
145	sleep(duration);
146	// Off. If it's really needed, provide example why
147	//if (sleep(duration)) {
148	// bb_perror_nomsg_and_die();
149	//}
150
151	#endif
152
153	return EXIT_SUCCESS;
154	}
155