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ABI_BREAKS.md

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ABI Breaks

This document lists the ABI breaks that were made in each mlibc major version.

Version 7

  • #1458: mlibc only defined fenv_t for x86(_64) before, new we define it correctly for all supported architectures.
  • #1458: due to incorrect macro usage, LONG_BIT was previously always defined to 64, even on 32-bit architectures. Now, it is set to 32 on 32-bit architectures.
  • #1458: PRI*FAST* macros had values that caused -Wformat warnings on 32-bit architectures, which got fixed.
  • #1458: ND_NA_FLAG_* macros were incorrectly not byte-swapped on big-endian architectures.
  • #1458: some members of struct link_map were always using Elf64_Addr instead of the correct ElfW(Addr) type.
  • #1459: the sizing of blksize_t and nlink_t was incorrect, which lead to incorrect layouts of Linux's struct stat for most architectures (i.e. non-x86)
  • #1459: the layout of struct statvfs and struct statvfs64 was incorrect
  • #1459: some O_* and F_* macros in <fcntl.h> were incorrect on some architectures and were fixed.
  • #1459: values of POLLWRNORM and POLLWRBAND were incorrect on m68k
  • #1459: fixed incorrect layout of struct shmid_ds
  • #1459: the layouts of sigcontext, ucontext_t and mcontext_t were incorrect in multiple architectures and got fixed.
  • #1459: the layout of struct msqid64_ds was incorrect due to a silently incorrect ifdef, which was fixed but broke ABI.
  • #1460: the size of the d_name member of dirent was changed to NAME_MAX+1 in order to align with the maximum permitted value size by POSIX.
  • #1460: the wcsxfrm and confstr function had incorrect return types, which were fixed.
  • #1460: PRIO_* values were fixed to align with the values Linux syscalls expect.
  • #1460: the alignment of fd_set was fixed.
  • #1460: the layout of struct semid_ds was fixed.
  • #1460: <sys/user.h> previously always defined structs for x86_64, which were changed to now be correct for all supported architectures.
  • #1460: off_t and off64_t are now always 64-bit instead of long.
  • #1460: fixed the layout of struct rtentry on 32-bit architectures.
  • #1460: useconds_t was turned into a 32-bit value, as it only needs to hold microsecond values worth up to a second.
  • #1492: changes the values of LC_* macros and nl_item values to match glibc, so that glibc locale files can be consumed.
  • #1492: fix struct epoll_event alignment on x86

Version 6

Numerous ABI breaks. These were not properly logged, and are therefore missing here. Pending update, if one ever comes.

Version 5

Numerous ABI breaks. These were not properly logged, and are therefore missing here. Pending update, if one ever comes.

Version 4

  • #814: struct timex's long int tai changed to the correct int tai, and int __padding[11] got appended to the struct.
  • #816: sys_wait4 on Linux now correctly returns a pid_t, not an int as previously.
  • #816: All MS_* macros of the sys/mount.h header were adjusted to match linux.
  • #816: struct epoll_event now gets correctly packed on x86_64.
  • #819: str(n)dupa is now defined as a pure macro, and not as a macro that points to a function.
  • #828: Linux-specific functions previously included in the posix option in pthreads.h and sched.h are not correctly guarded behind the linux option.
  • #828: The CPU_* macros of sched.h have been rewritten to resolve to internal mlibc implementations, and are now correctly guarded behind the linux option.
  • #735: sched_getcpu and setns were previously mistakenly C++-mangled and not declared, which has now been rectified.

Version 3

  • #728: The macros CMSG_{LEN,SPACE,DATA} were not accounting for padding between struct cmsghdr and it's respective data. This manifested itself as some parts of control data being skipped on platforms where struct cmsghdr is not divisible by alignof(size_t).
  • #452: The functions FD_{CLR,ISSET,SET,ZERO} were renamed to __FD_{CLR,ISSET,SET,ZERO} and replaced by macros to match Wine's assumptions.
  • #511: Musl's regex engine was added, implementing regcomp and regexec. This required some changes to the regex_t struct.
  • #504: In the Linux ABI, a domainname member was added to struct utsname, which is a glibc extension.
  • #311: Added all necessary fields in pthread_attr_t required for implementing all pthread_attr functions.
  • #652: The ABI of struct statfs and struct statvfs was changed to match Linux. socklen_t was also changed from unsigned long to unsigned int.
  • #658: In the Linux ABI, cc_t was changed from an unsigned int to an unsigned char.
  • #679: The struct glob_t received some additional members to bring it up to par with glibc.