| 1 | /*
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| 2 | * sleep -- sleep for fractions of a second
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| 3 | *
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| 4 | * usage: sleep seconds[.fraction]
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| 5 | */
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| 6 | #include "config.h"
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| 7 |
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| 8 | #include "bashtypes.h"
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| 9 |
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| 10 | #if defined (TIME_WITH_SYS_TIME)
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| 11 | # include <sys/time.h>
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| 12 | # include <time.h>
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| 13 | #else
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| 14 | # if defined (HAVE_SYS_TIME_H)
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| 15 | # include <sys/time.h>
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| 16 | # else
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| 17 | # include <time.h>
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| 18 | # endif
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| 19 | #endif
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| 20 |
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| 21 | #if defined (HAVE_UNISTD_H)
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| 22 | #include <unistd.h>
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| 23 | #endif
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| 24 |
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| 25 | #include <stdio.h>
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| 26 | #include "chartypes.h"
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| 27 |
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| 28 | #include "shell.h"
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| 29 | #include "builtins.h"
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| 30 |
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| 31 | #define RETURN(x) \
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| 32 | do { \
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| 33 | if (sp) *sp = sec; \
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| 34 | if (usp) *usp = usec; \
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| 35 | return (x); \
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| 36 | } while (0)
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| 37 |
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| 38 | #if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT)
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| 39 | static int
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| 40 | fsleep(sec, usec)
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| 41 | long sec, usec;
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| 42 | {
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| 43 | struct timeval tv;
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| 44 |
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| 45 | tv.tv_sec = sec;
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| 46 | tv.tv_usec = usec;
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| 47 |
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| 48 | return select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
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| 49 | }
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| 50 | #else /* !HAVE_TIMEVAL || !HAVE_SELECT */
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| 51 | static int
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| 52 | fsleep(sec, usec)
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| 53 | long sec, usec;
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| 54 | {
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| 55 | if (usec >= 500000) /* round */
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| 56 | sec++;
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| 57 | return (sleep(sec));
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| 58 | }
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| 59 | #endif /* !HAVE_TIMEVAL || !HAVE_SELECT */
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| 60 |
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| 61 | /*
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| 62 | * An incredibly simplistic floating point converter.
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| 63 | */
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| 64 | static int multiplier[7] = { 1, 100000, 10000, 1000, 100, 10, 1 };
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| 65 |
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| 66 | static int
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| 67 | convert(s, sp, usp)
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| 68 | char *s;
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| 69 | long *sp, *usp;
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| 70 | {
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| 71 | int n;
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| 72 | long sec, usec;
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| 73 | char *p;
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| 74 |
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| 75 | sec = usec = 0;
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| 76 |
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| 77 | #define DECIMAL '.'
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| 78 |
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| 79 | for (p = s; p && *p; p++) {
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| 80 | if (*p == DECIMAL) /* decimal point */
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| 81 | break;
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| 82 | if (DIGIT(*p) == 0)
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| 83 | RETURN(0);
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| 84 | sec = (sec * 10) + (*p - '0');
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| 85 | }
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| 86 |
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| 87 | if (*p == 0)
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| 88 | RETURN(1);
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| 89 |
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| 90 | if (*p == DECIMAL)
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| 91 | p++;
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| 92 |
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| 93 | /* Look for up to six digits past a decimal point. */
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| 94 | for (n = 0; n < 6 && p[n]; n++) {
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| 95 | if (DIGIT(p[n]) == 0)
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| 96 | RETURN(0);
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| 97 | usec = (usec * 10) + (p[n] - '0');
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| 98 | }
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| 99 |
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| 100 | /* Now convert to millionths */
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| 101 | usec *= multiplier[n];
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| 102 |
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| 103 | if (n == 6 && p[6] >= '5' && p[6] <= '9')
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| 104 | usec++; /* round up 1 */
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| 105 |
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| 106 | RETURN(1);
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| 107 | }
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| 108 |
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| 109 | int
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| 110 | sleep_builtin (list)
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| 111 | WORD_LIST *list;
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| 112 | {
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| 113 | long sec, usec;
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| 114 |
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| 115 | if (list == 0) {
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| 116 | builtin_usage();
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| 117 | return(EX_USAGE);
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| 118 | }
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| 119 |
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| 120 | if (*list->word->word == '-' || list->next) {
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| 121 | builtin_usage ();
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| 122 | return (EX_USAGE);
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| 123 | }
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| 124 |
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| 125 | if (convert(list->word->word, &sec, &usec)) {
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| 126 | fsleep(sec, usec);
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| 127 | return(EXECUTION_SUCCESS);
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| 128 | }
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| 129 |
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| 130 | builtin_error("%s: bad sleep interval", list->word->word);
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| 131 | return (EXECUTION_FAILURE);
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| 132 | }
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| 133 |
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| 134 | static char *sleep_doc[] = {
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| 135 | "sleep suspends execution for a minimum of SECONDS[.FRACTION] seconds.",
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| 136 | (char *)NULL
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| 137 | };
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| 138 |
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| 139 | struct builtin sleep_struct = {
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| 140 | "sleep",
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| 141 | sleep_builtin,
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| 142 | BUILTIN_ENABLED,
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| 143 | sleep_doc,
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| 144 | "sleep seconds[.fraction]",
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| 145 | 0
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| 146 | };
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