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9.542 link

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/link.html

LSB specification:
https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-link-1.html

Gnulib module: link

Portability problems fixed by Gnulib:

  • This function is missing on some platforms: mingw, MSVC 14.
  • This function fails to reject trailing slashes on non-directories on some platforms: FreeBSD 7.2, Solaris 11.3, Cygwin 1.5.x.
  • When the second argument is a dangling symlink, some platforms follow that link and create the destination rather than failing: IRIX 6.5.

Portability problems not fixed by Gnulib:

  • When the first argument is a symlink, some platforms create a hard-link to what the symlink referenced, rather than to the symlink itself. Use ‘linkat’ to force a particular behavior.