shmat函数在什么情况下会返回
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EINVAL The value of shmid is not a valid shared memory identifier, the shmaddr is not a null pointer, and the value of (shmaddr -((uintptr_t)shmaddr
%SHMLBA)) is an illegal address for attaching shared memory; or the shmaddr is not a null pointer, (shm*** &SHM_RND) is 0, and the value of shmaddr
is an illegal address for attaching shared memory.
EMFILE The number of shared memory segments attached to the calling process would exceed the system-imposed limit.
ENOMEM The available data space is not large enough to accommodate the shared memory segment.
%SHMLBA)) is an illegal address for attaching shared memory; or the shmaddr is not a null pointer, (shm*** &SHM_RND) is 0, and the value of shmaddr
is an illegal address for attaching shared memory.
EMFILE The number of shared memory segments attached to the calling process would exceed the system-imposed limit.
ENOMEM The available data space is not large enough to accommodate the shared memory segment.
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