xref: /titanic_44/usr/src/lib/libresolv2/common/bsd/writev.c (revision 40e5e17b3361b3eea56a9723071c406894a20b78)
1 /*
2  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 #ifndef LINT
7 static const char rcsid[] = "$Id: writev.c,v 8.6 2003/04/30 05:21:18 marka Exp $";
8 #endif
9 
10 
11 #pragma ident	"%Z%%M%	%I%	%E% SMI"
12 
13 #include "port_before.h"
14 
15 #include <sys/types.h>
16 #include <sys/uio.h>
17 #include <sys/stat.h>
18 #include <sys/socket.h>
19 
20 #include "port_after.h"
21 
22 #ifndef NEED_WRITEV
23 int __bindcompat_writev;
24 #else
25 
26 #ifdef _CRAY
27 #define OWN_WRITEV
28 int
29 __writev(int fd, struct iovec *iov, int iovlen)
30 {
31 	struct stat statbuf;
32 
33 	if (fstat(fd, &statbuf) < 0)
34 		return (-1);
35 
36 	/*
37 	 * Allow for atomic writes to network.
38 	 */
39 	if (S_ISSOCK(statbuf.st_mode)) {
40 		struct msghdr   mesg;
41 
42 		memset(&mesg, 0, sizeof(mesg));
43 		mesg.msg_name = 0;
44 		mesg.msg_namelen = 0;
45 		mesg.msg_iov = iov;
46 		mesg.msg_iovlen = iovlen;
47 		mesg.msg_accrights = 0;
48 		mesg.msg_accrightslen = 0;
49 		return (sendmsg(fd, &mesg, 0));
50 	} else {
51 		struct iovec *tv;
52 		int i, rcode = 0, count = 0;
53 
54 		for (i = 0, tv = iov; i <= iovlen; tv++) {
55 			rcode = write(fd, tv->iov_base, tv->iov_len);
56 
57 			if (rcode < 0)
58 				break;
59 
60 			count += rcode;
61 		}
62 
63 		if (count == 0)
64 			return (rcode);
65 		else
66 			return (count);
67 	}
68 }
69 
70 #else /*_CRAY*/
71 
72 int
73 __writev(fd, vp, vpcount)
74 	int fd;
75 	const struct iovec *vp;
76 	int vpcount;
77 {
78 	int count = 0;
79 
80 	while (vpcount-- > 0) {
81 		int written = write(fd, vp->iov_base, vp->iov_len);
82 
83 		if (written < 0)
84 			return (-1);
85 		count += written;
86 		if (written != vp->iov_len)
87 			break;
88 		vp++;
89 	}
90 	return (count);
91 }
92 
93 #endif /*_CRAY*/
94 
95 #endif /*NEED_WRITEV*/
96