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
|
/* ISC license. */
#include <skalibs/sysdeps.h>
#include <skalibs/nonposix.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <unistd.h>
#include <errno.h>
#include <skalibs/uint.h>
#include <skalibs/diuint.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/djbunix.h>
#include <skalibs/unixmessage.h>
/* MacOS X tries hard to be POSIX-compliant... and fails. */
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
int unixmessage_sender_flush (unixmessage_sender_t *b)
{
diuint last = { .left = b->data.len, .right = genalloc_len(int, &b->fds) } ;
diuint *offsets = genalloc_s(diuint, &b->offsets) ;
unsigned int n = genalloc_len(diuint, &b->offsets) ;
unsigned int oldhead = b->head ;
for (; b->head < n ; b->head++)
{
diuint *next = b->head+1 < n ? offsets + b->head+1 : &last ;
unsigned int len = next->left - offsets[b->head].left ;
unsigned int nfds = next->right - offsets[b->head].right ;
char pack[sizeof(unsigned int) << 1] ;
struct iovec v[2] =
{
{ .iov_base = pack, .iov_len = sizeof(unsigned int) << 1 },
{ .iov_base = b->data.s + offsets[b->head].left, .iov_len = len }
} ;
char ancilbuf[CMSG_SPACE(nfds * sizeof(int))] ;
struct msghdr hdr =
{
.msg_name = 0,
.msg_namelen = 0,
.msg_iov = v,
.msg_iovlen = 2,
.msg_control = nfds ? ancilbuf : 0,
.msg_controllen = nfds ? sizeof(ancilbuf) : 0
} ;
uint_pack_big(pack, len) ;
uint_pack_big(pack + sizeof(unsigned int), nfds) ;
if (nfds)
{
struct cmsghdr *cp = CMSG_FIRSTHDR(&hdr) ;
register unsigned int i = 0 ;
cp->cmsg_level = SOL_SOCKET ;
cp->cmsg_type = SCM_RIGHTS ;
cp->cmsg_len = CMSG_LEN(nfds * sizeof(int)) ;
for (; i < nfds ; i++)
{
register int fd = genalloc_s(int, &b->fds)[offsets[b->head].right + i] ;
((int *)CMSG_DATA(cp))[i] = fd < 0 ? -(fd+1) : fd ;
}
}
for (;;)
{
register int r = sendmsg(b->fd, &hdr, MSG_NOSIGNAL) ;
if (r == -1 && errno == EINTR) continue ;
if (r < (int)(len + (sizeof(unsigned int) << 1)))
return -(int)(b->head-oldhead)-1 ;
break ;
}
#ifndef SKALIBS_HASANCILAUTOCLOSE
if (nfds)
{
register unsigned int i = 0 ;
for (; i < nfds ; i++)
{
register int fd = genalloc_s(int, &b->fds)[offsets[b->head].right + i] ;
if (fd < 0) fd_close(-(fd+1)) ;
}
}
#endif
}
b->data.len = 0 ;
genalloc_setlen(int, &b->fds, 0) ;
genalloc_setlen(diuint, &b->offsets, 0) ;
b->head = 0 ;
return (int)(n - oldhead) ;
}
|
