1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
#include <sys/types.h>
#include <time.h>
#include "datetime.h"
#include "fork.h"
#include "wait.h"
#include "fd.h"
#include "fmt.h"
#include "strerr.h"
#include "substdio.h"
#include "subfd.h"
#include "readwrite.h"
#include "exit.h"
#define FATAL "predate: fatal: "
static char *montab[12] = {
"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"
};
char num[FMT_ULONG];
char outbuf[1024];
void main(argc,argv)
int argc;
char **argv;
{
time_t now;
struct tm *tm;
struct datetime dt;
datetime_sec utc;
datetime_sec local;
int minutes;
int pi[2];
substdio ss;
int wstat;
int pid;
sig_pipeignore();
if (!argv[1])
strerr_die1x(100,"predate: usage: predate child");
if (pipe(pi) == -1)
strerr_die2sys(111,FATAL,"unable to create pipe: ");
switch(pid = fork()) {
case -1:
strerr_die2sys(111,FATAL,"unable to fork: ");
case 0:
close(pi[1]);
if (fd_move(0,pi[0]) == -1)
strerr_die2sys(111,FATAL,"unable to set up fds: ");
sig_pipedefault();
execvp(argv[1],argv + 1);
strerr_die4sys(111,FATAL,"unable to run ",argv[1],": ");
}
close(pi[0]);
substdio_fdbuf(&ss,write,pi[1],outbuf,sizeof(outbuf));
time(&now);
tm = gmtime(&now);
dt.year = tm->tm_year;
dt.mon = tm->tm_mon;
dt.mday = tm->tm_mday;
dt.hour = tm->tm_hour;
dt.min = tm->tm_min;
dt.sec = tm->tm_sec;
utc = datetime_untai(&dt); /* utc == now, if gmtime ignores leap seconds */
tm = localtime(&now);
dt.year = tm->tm_year;
dt.mon = tm->tm_mon;
dt.mday = tm->tm_mday;
dt.hour = tm->tm_hour;
dt.min = tm->tm_min;
dt.sec = tm->tm_sec;
local = datetime_untai(&dt);
substdio_puts(&ss,"Date: ");
substdio_put(&ss,num,fmt_uint(num,dt.mday));
substdio_puts(&ss," ");
substdio_puts(&ss,montab[dt.mon]);
substdio_puts(&ss," ");
substdio_put(&ss,num,fmt_uint(num,dt.year + 1900));
substdio_puts(&ss," ");
substdio_put(&ss,num,fmt_uint0(num,dt.hour,2));
substdio_puts(&ss,":");
substdio_put(&ss,num,fmt_uint0(num,dt.min,2));
substdio_puts(&ss,":");
substdio_put(&ss,num,fmt_uint0(num,dt.sec,2));
if (local < utc) {
minutes = (utc - local + 30) / 60;
substdio_puts(&ss," -");
substdio_put(&ss,num,fmt_uint0(num,minutes / 60,2));
substdio_put(&ss,num,fmt_uint0(num,minutes % 60,2));
}
else {
minutes = (local - utc + 30) / 60;
substdio_puts(&ss," +");
substdio_put(&ss,num,fmt_uint0(num,minutes / 60,2));
substdio_put(&ss,num,fmt_uint0(num,minutes % 60,2));
}
substdio_puts(&ss,"\n");
substdio_copy(&ss,subfdin);
substdio_flush(&ss);
close(pi[1]);
if (wait_pid(&wstat,pid) == -1)
strerr_die2sys(111,FATAL,"wait failed: ");
if (wait_crashed(wstat))
strerr_die2x(111,FATAL,"child crashed");
_exit(wait_exitcode(wstat));
}
|
