doc: Update and improve documentation of glibc functions

[Bruno Haible]

Pushed:

2019-06-10  Bruno Haible  <address@hidden>

        doc: Update and improve documentation of glibc functions.
        This is a series of commits that
        - updates the documentation to the state of glibc 2.29,
        - adds references to Linux man pages and glibc documentation,
        - marks Linux specific functions as such.
        These are the commits:
        doc: Update after removal of crypt functions from glibc 2.28.
        doc: Remove mention of function vm86 (does not exist on x86_64).
        doc: Remove mention of functions that are gone from glibc.
        doc: Mention that glibc no longer provides h_errno.
        doc: Mention the availability of specific functions in glibc versions.
        doc: Mention eaccess.
        doc: Add references to Linux man pages.
        doc: Add references to glibc documentation.
        doc: Mention inotify_* functions.
        doc: Mention ppoll.
        doc: Mention sched_getcpu.
        doc: Mention sync_file_range.
        doc: Mention epoll_pwait.
        doc: Mention eventfd, eventfd_read, eventfd_write.
        doc: Mention signalfd.
        doc: Mention timerfd_create, timerfd_gettime, timerfd_settime.
        doc: Mention epoll_create1.
        doc: Mention getauxval.
        doc: Mention pthread_getattr_default_np, pthread_setattr_default_np.
        doc: Mention nextdown, nextup.
        doc: Mention more ISO TS 18661-1 <math.h> functions.
        doc: Mention ISO TS 18661-1 <fenv.h> functions.
        doc: Mention getrandom, getentropy.
        doc: Mention strfromf, strfromd, strfroml.
        doc: Mention preadv2, pwritev2.
        doc: Mention copy_file_range.
        doc: Mention memfd_create.
        doc: Mention mlock2.
        doc: Mention pkey_alloc, pkey_set, pkey_get, pkey_free, pkey_mprotect.
        doc: Mention more ISO TS 18661-1 <math.h> functions.
        doc: Mention renameat2.
        doc: Mention statx.
        doc: Mention the ISO C11 multithreading header and functions.
        doc: Mention getcpu.
        doc: Mention posix_spawn_file_actions_add[f]chdir_np.
        doc: Some glibc functions also exist on IRIX 6.5 in 32-bit mode.
        doc: Some glibc functions also exist on FreeBSD, AIX, HP-UX, Solaris 11.
        doc: Some glibc functions also exist on FreeBSD, Solaris 11.
        doc: Some glibc functions also exist on Solaris 11.
        doc: Some glibc functions also exist on Solaris 11.4.
        doc: Some glibc functions also exist on FreeBSD.
        doc: Some glibc functions also exist on BeOS.
        doc: Some glibc functions also exist on Haiku.
        doc: Mark functions which exist only on Linux.
        doc: Mark functions which exist only on Linux and illumos.

See https://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=shortlog