move sleep to bonsai coreutils

Retired/sleep/Makefile

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+sleep: sleep.c

Retired/sleep/sleep.1

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+.TH SLEEP 1
+
+.SH NAME
+
+sleep \(en wait a moment
+
+.SH SYNOPSIS
+
+sleep
+.RB [ seconds ]
+
+.SH DESCRIPTION
+
+Sleep waits the given amount of seconds before exiting.
+
+.SH EXIT STATUS
+
+Sleep exits with a status indicating how much time is left for the program to sleep;
+in practice, this is always 0.
+
+.SH BUGS
+
+User may still be tired after invoking sleep.
+
+.SH COPYRIGHT
+
+Public domain.
+
+.SH SEE ALSO
+
+sleep(3)

Retired/sleep/sleep.c

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+#include <errno.h> /* errno */
+#include <stdio.h> /* fprintf(3), stderr */
+#include <stdlib.h> /* strtol(3) */
+#include <sysexits.h> /* EX_USAGE */
+#include <unistd.h> /* sleep(3) */
+
+static char *program_name = "sleep";
+
+int main(int argc, char **argv){
+	int s;
+	extern int errno;
+
+	if(argc != 2){
+usage:		fprintf(stderr, "Usage: %s [seconds]\n",
+				argv[0] == NULL ? program_name : argv[0]);
+		return EX_USAGE;
+	}
+	errno = 0;
+	s = strtol(argv[1], &argv[1], 10);
+	if(*argv[1] != '\0' || errno != 0)
+		goto usage;
+	while(s > 0)
+		s = sleep(s);
+	return s;
+}