diff --git a/bin/sleep/sleep.1 b/bin/sleep/sleep.1 index b6af3a648a97..c9069a015706 100644 --- a/bin/sleep/sleep.1 +++ b/bin/sleep/sleep.1 @@ -1,132 +1,133 @@ .\"- .\" Copyright (c) 1990, 1993, 1994 .\" The Regents of the University of California. All rights reserved. .\" .\" This code is derived from software contributed to Berkeley by .\" the Institute of Electrical and Electronics Engineers, Inc. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd May 25, 2022 +.Dd March 22, 2024 .Dt SLEEP 1 .Os .Sh NAME .Nm sleep .Nd suspend execution for an interval of time .Sh SYNOPSIS .Nm .Ar number Ns Op Ar unit -.Ar ... +.Op ... .Sh DESCRIPTION The .Nm command suspends execution for a minimum of .Ar number seconds (the default, or unit -.Cm s ) , +.Li s ) , minutes (unit -.Cm m ) , +.Li m ) , hours (unit -.Cm h ) , +.Li h ) , or days (unit -.Cm d ) . -If multiple arguments are passed, the delay will be the sum of all values. +.Li d ) . +Intervals can be written in any form allowed by +.Xr strtod 3 . +If multiple intervals are given, they are added together. +If the final sum is zero or negative, +.Nm +exits immediately. .Pp If the .Nm command receives a signal, it takes the standard action. When the .Dv SIGINFO signal is received, the estimate of the amount of seconds left to sleep is printed on the standard output. .Sh IMPLEMENTATION NOTES The .Dv SIGALRM signal is not handled specially by this implementation. -.Pp -The -.Nm -command supports other time units than seconds, -honors a non-integer number of time units to sleep in any form acceptable by -.Xr strtod 3 , -and accepts more than one delay value. -These are non-portable extensions, but they have also been implemented -in GNU sh-utils since version 2.0a (released in 2002). .Sh EXIT STATUS .Ex -std .Sh EXAMPLES -To schedule the execution of a command for -.Va x -number seconds later (with -.Xr csh 1 ) : +To run a command after half an hour: .Pp -.Dl (sleep 1800; sh command_file >& errors)& +.Dl (sleep 0.5h; sh command_file >out 2>err)& .Pp -This incantation would wait a half hour before -running the script command_file. -(See the +This incantation would wait half an hour before +running the script +.Pa command_file . +See the .Xr at 1 -utility.) +utility for another way to do this. .Pp -To reiteratively run a command (with the -.Xr csh 1 ) : +To reiteratively run a command: .Pp .Bd -literal -offset indent -compact -while (1) - if (! -r zzz.rawdata) then - sleep 300 +while :; do + if ! [ -r zzz.rawdata ] ; then + sleep 5m else - foreach i (`ls *.rawdata`) + for i in *.rawdata ; do sleep 70 - awk -f collapse_data $i >> results - end + awk -f collapse_data "$i" + done >results break - endif -end + fi +done .Ed .Pp The scenario for a script such as this might be: a program currently running is taking longer than expected to process a series of files, and it would be nice to have another program start processing the files created by the first -program as soon as it is finished (when zzz.rawdata is created). -The script checks every five minutes for the file zzz.rawdata, +program as soon as it is finished (when +.Pa zzz.rawdata +is created). +The script checks every five minutes for the file +.Pa zzz.rawdata , when the file is found, then another portion processing is done courteously by sleeping for 70 seconds in between each -awk job. +.Xr awk 1 +job. .Sh SEE ALSO .Xr nanosleep 2 , .Xr sleep 3 .Sh STANDARDS The .Nm command is expected to be .St -p1003.2 compatible. +.Pp +Support for non-integer intervals, units other than seconds, and +multiple intervals which are added together are non-portable +extensions first introduced in GNU sh-utils 2.0a (released in 2002). .Sh HISTORY A .Nm command appeared in .At v4 . diff --git a/bin/sleep/sleep.c b/bin/sleep/sleep.c index 20e525ce093c..34d335cf4736 100644 --- a/bin/sleep/sleep.c +++ b/bin/sleep/sleep.c @@ -1,123 +1,130 @@ /*- * Copyright (c) 1988, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include +#include #include #include #include #include - -static void usage(void) __dead2; +#include static volatile sig_atomic_t report_requested; + static void report_request(int signo __unused) { - report_requested = 1; } +static void __dead2 +usage(void) +{ + fprintf(stderr, "usage: sleep number[unit] [...]\n" + "Unit can be 's' (seconds, the default), " + "m (minutes), h (hours), or d (days).\n"); + exit(1); +} + +static double +parse_interval(const char *arg) +{ + double num; + char unit, extra; + + switch (sscanf(arg, "%lf%c%c", &num, &unit, &extra)) { + case 2: + switch (unit) { + case 'd': + num *= 24; + /* FALLTHROUGH */ + case 'h': + num *= 60; + /* FALLTHROUGH */ + case 'm': + num *= 60; + /* FALLTHROUGH */ + case 's': + if (!isnan(num)) + return (num); + } + break; + case 1: + if (!isnan(num)) + return (num); + } + warnx("invalid time interval: %s", arg); + return (INFINITY); +} + int main(int argc, char *argv[]) { struct timespec time_to_sleep; - double d, seconds; + double seconds; time_t original; - char unit; - char buf[2]; - int i, matches; if (caph_limit_stdio() < 0 || caph_enter() < 0) err(1, "capsicum"); - if (argc < 2) + while (getopt(argc, argv, "") != -1) + usage(); + argc -= optind; + argv += optind; + if (argc < 1) usage(); seconds = 0; - for (i = 1; i < argc; i++) { - matches = sscanf(argv[i], "%lf%c%1s", &d, &unit, buf); - if (matches == 2) - switch(unit) { - case 'd': - d *= 24; - /* FALLTHROUGH */ - case 'h': - d *= 60; - /* FALLTHROUGH */ - case 'm': - d *= 60; - /* FALLTHROUGH */ - case 's': - break; - default: - usage(); - } - else - if (matches != 1) - usage(); - seconds += d; - } + while (argc--) + seconds += parse_interval(*argv++); if (seconds > INT_MAX) usage(); - if (seconds <= 0) - return (0); + if (seconds < 1e-9) + exit(0); original = time_to_sleep.tv_sec = (time_t)seconds; time_to_sleep.tv_nsec = 1e9 * (seconds - time_to_sleep.tv_sec); signal(SIGINFO, report_request); - /* - * Note: [EINTR] is supposed to happen only when a signal was handled - * but the kernel also returns it when a ptrace-based debugger - * attaches. This is a bug but it is hard to fix. - */ while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) { + if (errno != EINTR) + err(1, "nanosleep"); if (report_requested) { /* Reporting does not bother with nanoseconds. */ - warnx("about %d second(s) left out of the original %d", - (int)time_to_sleep.tv_sec, (int)original); + warnx("about %ld second(s) left out of the original %ld", + (long)time_to_sleep.tv_sec, (long)original); report_requested = 0; - } else if (errno != EINTR) - err(1, "nanosleep"); + } } - return (0); -} -static void -usage(void) -{ - - fprintf(stderr, "usage: sleep number[unit] ...\n"); - fprintf(stderr, "Unit can be 's' (seconds, the default), " - "m (minutes), h (hours), or d (days).\n"); - exit(1); + exit(0); }