Hello, development team of uclibc-ng,

We are a company from China called Ingenic, and we have recently observed that msgctl(), shmctl() and semctl() do not fully support time64 in the latest version of uclibc-ng.

When time64 is enabled on mips, timestamps of semaphore obtained by msgclt, shmctl and semctl are incorrectly, and semctl will report segmentation fault if RMID operation is used. The timestamp of the semaphore on arm platform is also wrong.

These errors seem to be caused by incomplete support for time64. Although struct semid_ds is modified for time64, the positions of its members are inconsistent with those of struct semid64_ds in the kernel, resulting in incorrect semaphore timestamps obtained by semctl. In addition, struct shmid_ds and struct msqid_ds do not seem to support time64. Besides, when semctl removes the semaphore using RMID, the union semun arg is NULL and does not point to the semaphore instance. Accessing members of struct semid_ds will result in a segmentation fault.

The attachment is my modification for three functions and structs they required on the mips platform, which can be used as a reference. If you think these three functions do not need to be modified, hope you can write to tell me the reason.

Looking forward to your reply !

Best regards, Liu Yu