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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/* ISC license. */
#include <skalibs/nonposix.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <skalibs/posixplz.h>
#include <skalibs/uint64.h>
#include <skalibs/types.h>
#include <skalibs/bytestr.h>
#include <skalibs/envexec.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/djbunix.h>
#include <skalibs/socket.h>
#define USAGE "s6-notify-fd-from-socket [ -f ] [ -3 fd ] [ -t timeout ] prog..."
#define dieusage() strerr_dieusage(100, USAGE)
enum golb_e
{
GOLB_SINGLEFORK = 0x01,
} ;
enum gola_e
{
GOLA_NOTIF,
GOLA_TIMEOUT,
GOLA_N
} ;
static void bindit (int sock, char *name)
{
struct sockaddr_un addr = { .sun_family = AF_UNIX, .sun_path = "" } ;
socklen_t addrlen = sizeof(struct sockaddr_un) ;
if (bind(sock, (struct sockaddr *)&addr, sizeof(sa_family_t)) == -1) /* autobind */
strerr_diefu1sys(111, "bind") ;
if (getsockname(sock, (struct sockaddr *)&addr, &addrlen) == -1)
strerr_diefu1sys(111, "getsockname") ;
if (addr.sun_path[0])
strerr_diefu1x(111, "autobind to an abstract socket") ;
memcpy(name, addr.sun_path + 1, 5) ;
name[5] = 0 ;
}
static inline int run_child (int sock, int fd, unsigned int timeout)
{
char buf[8192] ;
iopause_fd x = { .fd = sock, .events = IOPAUSE_READ } ;
int found = 0 ;
tain deadline = TAIN_INFINITE_RELATIVE ;
tain_now_g() ;
if (timeout) tain_from_millisecs(&deadline, timeout) ;
tain_add_g(&deadline, &deadline) ;
while (!found)
{
int r = iopause_g(&x, 1, &deadline) ;
if (r == -1) strerr_diefu1sys(111, "iopause") ;
if (!r) strerr_dief1x(99, "timed out waiting for notification") ;
r = sanitize_read(fd_recv(sock, buf, 8191, 0)) ;
if (r == -1)
{
if (errno == EPIPE) _exit(0) ;
else strerr_diefu1sys(111, "recv") ;
}
if (r)
{
buf[r++] = 0 ;
if (!strncmp(buf, "READY=1\n", 8) || strstr(buf, "\nREADY=1\n"))
found = 1 ;
}
}
fd_write(fd, "\n", 1) ;
_exit(0) ;
}
static inline int read_uint (char const *file, unsigned int *fd)
{
char buf[UINT_FMT + 1] ;
ssize_t r = openreadnclose_nb(file, buf, UINT_FMT) ;
if (r == -1) return -1 ;
buf[byte_chr(buf, r, '\n')] = 0 ;
return !!uint0_scan(buf, fd) ;
}
int main (int argc, char const *const *argv)
{
static gol_bool const rgolb[] =
{
{ .so = 'f', .lo = "no-doublefork", .clear = 0, .set = GOLB_SINGLEFORK },
{ .so = 0, .lo = "doublefork", .clear = GOLB_SINGLEFORK, .set = 0 },
} ;
static gol_arg const rgola[] =
{
{ .so = '3', .lo = "notification-fd", .i = GOLA_NOTIF },
{ .so = 't', .lo = "timeout", .i = GOLA_TIMEOUT },
} ;
unsigned int fd = 0 ;
unsigned int timeout = 0 ;
uint64_t wgolb = 0 ;
char const *wgola[GOLA_N] = { 0 } ;
pid_t pid ;
int sock ;
unsigned int golc ;
char modif[21] = "NOTIFY_SOCKET=@XXXXX" ;
PROG = "s6-notify-fd-from-socket" ;
golc = GOL_main(argc, argv, rgolb, rgola, &wgolb, wgola) ;
argc -= golc ; argv += golc ;
if (!argc) dieusage() ;
if (wgola[GOLA_TIMEOUT] && !uint0_scan(wgola[GOLA_TIMEOUT], &timeout))
strerr_dief2x(100, "timeout", " must be an unsigned integer") ;
if (wgola[GOLA_NOTIF])
{
if (!uint0_scan(wgola[GOLA_NOTIF], &fd))
strerr_dief2x(100, "notification-fd", " must be an unsigned integer") ;
}
else
{
int r = read_uint("notification-fd", &fd) ;
if (r == -1) strerr_diefu2sys(111, "read ", "./notification-fd") ;
if (!r) strerr_dief2x(100, "invalid ", "./notification-fd") ;
}
if (fcntl(fd, F_GETFD) == -1)
strerr_dief2sys(111, "notification-fd", " sanity check failed") ;
sock = ipc_datagram_nbcoe() ;
if (sock == -1) strerr_diefu1sys(111, "create socket") ;
bindit(sock, modif + 15) ;
pid = wgolb & GOLB_SINGLEFORK ? fork() : doublefork() ;
if (pid == -1) strerr_diefu1sys(111, wgolb & GOLB_SINGLEFORK ? "fork" : "doublefork") ;
if (!pid) run_child(sock, fd, timeout) ;
fd_close(sock) ;
fd_close(fd) ;
xmexec_n(argv, modif, 21, 1) ;
}
|
