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* mmsghdr.c (decode_mmsgvec): Clear syserror for the time of printing
struct mmsghdr array in !use_msg_len case.
(SYS_FUNC(sendmmsg)): As failed sendmmsg syscall does not
set msg_len fields, tell this to decode_mmsgvec.
* tests/mmsg_name.c (test_mmsg_name): Check it.
* defs.h (decode_mmsgvec): Add int argument.
* mmsghdr.c (print_struct_mmsghdr_config): Add msg_len_vlen field.
(print_struct_mmsghdr): Print struct mmsghdr.msg_len only for
msg_len_vlen first elements of struct mmsghdr array.
(decode_mmsgvec): Add msg_len_vlen argument.
(SYS_FUNC(sendmmsg), SYS_FUNC(recvmmsg)): Pass to decode_mmsgvec
the number of elements of struct mmsghdr array that contain meaningful
struct mmsghdr.msg_len.
* tests/mmsg_name.c (test_mmsg_name): Check it.
As msg_namelen fields of recvmmsg syscall's struct msghdr array have
the same read-write semantics as struct msghdr argument of recvmsg
syscall, parser of recvmmsg syscall needs a similar fix.
* mmsghdr.c (print_struct_mmsghdr): Increment p_user_msg_namelen field.
(mmsgvec_data): New structure.
(free_mmsgvec_data, save_mmsgvec_namelen): New functions.
(decode_mmsgvec): Take into account the data saved
by save_mmsgvec_namelen function.
(SYS_FUNC(recvmmsg)): Use save_mmsgvec_namelen.
* fetch_struct_mmsghdr.c (sizeof_struct_mmsghdr): New mpers printer.
* mmsghdr.c: Include <limits.h>.
(print_struct_mmsghdr_config): New structure.
(fetch_struct_mmsghdr_or_printaddr, print_struct_mmsghdr): New functions.
(decode_mmsgvec): Rewrite using them and print_array.
As the value returned by sprint_timespec points to a static area and may
be overwritten by subsequent calls to sprint_timespec, it is not safe to
save this value on entering syscall and use it later on exiting.
* mmsghdr.c (SYS_FUNC(recvmmsg)): On entering syscall, copy the value
returned by sprint_timespec to a dynamically allocated memory, and save
the pointer using set_tcb_priv_data. On exiting, restore it using
get_tcb_priv_data.
