[PATCH] send.2, recv.2: add msg_iovlen POSIX note

[PATCH] send.2, recv.2: add msg_iovlen POSIX note

[Alyssa Ross]

msg_iovlen is incorrectly typed (according to POSIX) in addition to
msg_controllen, but unlike msg_controllen, this wasn't mentioned for
msg_iovlen.

msg_iovlen being incorrectly typed hasn't been reported as a GCC bug,
but there's no point since it is caused by the same underlying issue.

Sources: POSIX.1-2017 (<sys/socket.h>), Linux (include/linux/socket.h)

Signed-off-by: Alyssa Ross <hi@alyssa.is>
---
 man2/recv.2 | 13 +++++++++----
 man2/send.2 | 13 +++++++++----
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/man2/recv.2 b/man2/recv.2
index 78ae86e52..7c4b70c7a 100644
--- a/man2/recv.2
+++ b/man2/recv.2
@@ -533,13 +533,18 @@ field of the
 .I msghdr
 structure should be typed as
 .IR socklen_t ,
-but glibc currently types it as
+and the
+.I msg_iovlen
+field should be typed as
+.IR int ,
+but glibc currently types both as
 .IR size_t .
-.\" glibc bug raised 12 Mar 2006
+.\" glibc bug for msg_controllen raised 12 Mar 2006
 .\" http://sourceware.org/bugzilla/show_bug.cgi?id=2448
 .\" The problem is an underlying kernel issue: the size of the
-.\" __kernel_size_t type used to type this field varies
-.\" across architectures, but socklen_t is always 32 bits.
+.\" __kernel_size_t type used to type these fields varies
+.\" across architectures, but socklen_t is always 32 bits,
+.\" as (at least with GCC) is int.
 .PP
 See
 .BR recvmmsg (2)
diff --git a/man2/send.2 b/man2/send.2
index 0dd35d783..de224b307 100644
--- a/man2/send.2
+++ b/man2/send.2
@@ -441,13 +441,18 @@ field of the
 .I msghdr
 structure should be typed as
 .IR socklen_t ,
-but glibc currently types it as
+and the
+.I msg_iovlen
+field should be typed as
+.IR int ,
+but glibc currently types both as
 .IR size_t .
-.\" glibc bug raised 12 Mar 2006
+.\" glibc bug for msg_controllen raised 12 Mar 2006
 .\" http://sourceware.org/bugzilla/show_bug.cgi?id=2448
 .\" The problem is an underlying kernel issue: the size of the
-.\" __kernel_size_t type used to type this field varies
-.\" across architectures, but socklen_t is always 32 bits.
+.\" __kernel_size_t type used to type these fields varies
+.\" across architectures, but socklen_t is always 32 bits,
+.\" as (at least with GCC) is int.
 .PP
 See
 .BR sendmmsg (2)
-- 
2.26.2

Re: [PATCH] send.2, recv.2: add msg_iovlen POSIX note

[Michael Kerrisk (man-pages)]

Hello Alyssa,

On 7/3/20 3:25 AM, Alyssa Ross wrote:
> msg_iovlen is incorrectly typed (according to POSIX) in addition to
> msg_controllen, but unlike msg_controllen, this wasn't mentioned for
> msg_iovlen.
> 
> msg_iovlen being incorrectly typed hasn't been reported as a GCC bug,
> but there's no point since it is caused by the same underlying issue.
> 
> Sources: POSIX.1-2017 (<sys/socket.h>), Linux (include/linux/socket.h)
> 
> Signed-off-by: Alyssa Ross <hi@alyssa.is>

Thanks. Patch applied.

Cheers,

Michael

> ---
>  man2/recv.2 | 13 +++++++++----
>  man2/send.2 | 13 +++++++++----
>  2 files changed, 18 insertions(+), 8 deletions(-)
> 
> diff --git a/man2/recv.2 b/man2/recv.2
> index 78ae86e52..7c4b70c7a 100644
> --- a/man2/recv.2
> +++ b/man2/recv.2
> @@ -533,13 +533,18 @@ field of the
>  .I msghdr
>  structure should be typed as
>  .IR socklen_t ,
> -but glibc currently types it as
> +and the
> +.I msg_iovlen
> +field should be typed as
> +.IR int ,
> +but glibc currently types both as
>  .IR size_t .
> -.\" glibc bug raised 12 Mar 2006
> +.\" glibc bug for msg_controllen raised 12 Mar 2006
>  .\" http://sourceware.org/bugzilla/show_bug.cgi?id=2448
>  .\" The problem is an underlying kernel issue: the size of the
> -.\" __kernel_size_t type used to type this field varies
> -.\" across architectures, but socklen_t is always 32 bits.
> +.\" __kernel_size_t type used to type these fields varies
> +.\" across architectures, but socklen_t is always 32 bits,
> +.\" as (at least with GCC) is int.
>  .PP
>  See
>  .BR recvmmsg (2)
> diff --git a/man2/send.2 b/man2/send.2
> index 0dd35d783..de224b307 100644
> --- a/man2/send.2
> +++ b/man2/send.2
> @@ -441,13 +441,18 @@ field of the
>  .I msghdr
>  structure should be typed as
>  .IR socklen_t ,
> -but glibc currently types it as
> +and the
> +.I msg_iovlen
> +field should be typed as
> +.IR int ,
> +but glibc currently types both as
>  .IR size_t .
> -.\" glibc bug raised 12 Mar 2006
> +.\" glibc bug for msg_controllen raised 12 Mar 2006
>  .\" http://sourceware.org/bugzilla/show_bug.cgi?id=2448
>  .\" The problem is an underlying kernel issue: the size of the
> -.\" __kernel_size_t type used to type this field varies
> -.\" across architectures, but socklen_t is always 32 bits.
> +.\" __kernel_size_t type used to type these fields varies
> +.\" across architectures, but socklen_t is always 32 bits,
> +.\" as (at least with GCC) is int.
>  .PP
>  See
>  .BR sendmmsg (2)
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/