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| author |   millert <millert@openbsd.org> | 1998-07-28 19:47:07 +0000 |
|---|---|---|
| committer | millert <millert@openbsd.org> | 1998-07-28 19:47:07 +0000 |
| commit | 1f681a38ff09a42a10d6fd9d1fe951b7460bf87a (patch) | |
| tree | 0611465b28b9f5a3bab6185f83d5254a85556a41 /lib/libc/sys/write.2 | |
| parent | Fix indentation problems. (diff) | |
| download | wireguard-openbsd-1f681a38ff09a42a10d6fd9d1fe951b7460bf87a.tar.xz wireguard-openbsd-1f681a38ff09a42a10d6fd9d1fe951b7460bf87a.zip | |
For read, write, send, sendto, recv, recvfrom return EINVAL is size arg > SSIZE_MAX. For readv, writev, sendmsg, recvmsg return EINVAL if sum of the over iov_len values overflows an ssize_t. Based on what XPG 4.2 says (though XPG is not entirely consistent here). Basically since the return value is ssize_t allowing size > SSIZE_MAX is bad since people who (incorrectly mind you) check the return value for < 0 instead of == -1 will have bad things happen to them.
Diffstat (limited to 'lib/libc/sys/write.2')
| -rw-r--r-- | lib/libc/sys/write.2 | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/lib/libc/sys/write.2 b/lib/libc/sys/write.2 index b5d6bb5dcef..5acf9029136 100644 --- a/lib/libc/sys/write.2 +++ b/lib/libc/sys/write.2 @@ -1,4 +1,4 @@ -.\" $OpenBSD: write.2,v 1.5 1998/07/28 04:13:33 millert Exp $ +.\" $OpenBSD: write.2,v 1.6 1998/07/28 19:47:11 millert Exp $ .\" $NetBSD: write.2,v 1.6 1995/02/27 12:39:43 cgd Exp $ .\" .\" Copyright (c) 1980, 1991, 1993 @@ -34,7 +34,7 @@ .\" .\" @(#)write.2 8.5 (Berkeley) 4/2/94 .\" -.Dd April 2, 1994 +.Dd July 28, 1998 .Dt WRITE 2 .Os BSD 4 .Sh NAME @@ -177,7 +177,17 @@ The file was marked for non-blocking I/O, and no data could be written immediately. .El .Pp -In addition, +In addition, +.Fn write +may return following error: +.Bl -tag -width Er +.It Bq Er EINVAL +.Fa nbytes +was larger than +.Ev SSIZE_MAX . +.El +.Pp +Also, .Fn writev may return one of the following errors: .Bl -tag -width Er @@ -190,7 +200,8 @@ The sum of the .Fa iov_len values in the .Fa iov -array overflowed an unsigned 32-bit integer. +array overflowed an +.Em ssize_t . .El .Sh SEE ALSO .Xr fcntl 2 , |