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PR: kern/29698 (part)

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Reviewed by:	audit
Implement SEM_STAT (like IPC_STAT but treats semid as sema-index).
The linuxerator will need it.
This commit is contained in:
mr 2001-09-13 21:06:41 +00:00
parent 2afc0f9696
commit 30b1089d33
2 changed files with 21 additions and 0 deletions
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19
sys/kern/sysv_sem.c
View File

@ -499,6 +499,25 @@ __semctl(td, uap)
goto done2;
}
switch(cmd) {
case SEM_STAT:
if (semid < 0 || semid >= seminfo.semmsl)
return(EINVAL);
semaptr = &sema[semid];
if ((semaptr->sem_perm.mode & SEM_ALLOC) == 0 )
return(EINVAL);
if ((error = ipcperm(td, &semaptr->sem_perm, IPC_R)))
return(error);
if ((error = copyin(arg, &real_arg, sizeof(real_arg))) != 0)
return(error);
error = copyout((caddr_t)semaptr, real_arg.buf,
sizeof(struct semid_ds));
rval = IXSEQ_TO_IPCID(semid,semaptr->sem_perm);
if (error == 0)
td->td_retval[0] = rval;
goto done2;
}
semid = IPCID_TO_IX(semid);
if (semid < 0 || semid >= seminfo.semmsl) {
error = EINVAL;

2
sys/sys/sem.h
View File

@ -58,6 +58,8 @@ union semun {
#define GETZCNT 7 /* Return the value of semzcnt {READ} */
#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
#define SETALL 9 /* Set semvals from arg.array {ALTER} */
#define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
#define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
/*
* Permissions