https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224300
Bug ID: 224300
Summary: sys/sem.h improperly declares union semun
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
sys/sem.h declares union semun imporpertly. According to the POSIX manpage, it
should be declared by the application if required:
> The semctl() function provides a variety of semaphore control operations as
> specified by cmd. The fourth argument is optional and depends upon the
> operation requested. If required, it is of type union semun, which the
> application shall explicitly declare:
>
> union semun {
> int val;
> struct semid_ds *buf;
> unsigned short *array;
> } arg;
union semun is used in the kernel so the declaration should be moved under an
#ifdef _KERNEL and an exprun should be performed. It looks like configure
scripts commonly handle this case so it may change code, but shouldn't break
much.
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