semget.2 (2010 09)

semget(2) semget(2)

[EINVAL] nsems is either less than or equal to zero or greater than the system-imposed limit.

[EACCES] A semaphore identiﬁer exists for key, but operation permission as speciﬁed by the

low-order 9 bits of semﬂg would not be granted.

[EINVAL] A semaphore identiﬁer exists for key , but the number of semaphores in the set asso-

ciated with it is less than nsems , and nsems is not equal to zero.

[ENOENT] A semaphore identiﬁer does not exist for key and (semﬂg &

IPC_CREAT)is"false".

[ENOSPC] A semaphore identiﬁer is to be created, but the system-imposed limit on the max-

imum number of allowed semaphore identiﬁers system wide would be exceeded.

[EEXIST] A semaphore identiﬁer exists for key but

((semﬂg& IPC_CREAT) && (semﬂg &

IPC_EXCL)) is "true".