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w: Use POSIX <utmpx.h> functions where available

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<utmp.h> has been deprecated since 2001 in favour of <utmpx.h>.

On glibc systems, utmp is just an alias to utmpx, so there is no
functional change using one over the other.

However, on the musl libc, a library (utmps) can be used to provide
utmpx functionality - but not utmp.  This means that procps either
doesn't work properly (`w` shows nothing under musl with default no-op
implementation), or fails to build (utmps provides utmpx.h but no
utmp.h).

This commit will use utmpx.h where available, which allows `w` to work
correctly with utmps and has no change on glibc systems.
This commit is contained in:
A. Wilcox
2018-06-16 02:26:53 -05:00
committed by Craig Small
parent bf92199ccb
commit 3c1fed7d65
2 changed files with 37 additions and 2 deletions
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2
configure.ac
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@@ -51,7 +51,7 @@ else
fi
# Checks for header files.
AC_HEADER_MAJOR
AC_CHECK_HEADERS([arpa/inet.h fcntl.h float.h langinfo.h libintl.h limits.h locale.h netinet/in.h stdint.h stdio_ext.h stdlib.h string.h sys/file.h sys/ioctl.h sys/param.h sys/time.h termios.h unistd.h utmp.h values.h wchar.h wctype.h])
AC_CHECK_HEADERS([arpa/inet.h fcntl.h float.h langinfo.h libintl.h limits.h locale.h netinet/in.h stdint.h stdio_ext.h stdlib.h string.h sys/file.h sys/ioctl.h sys/param.h sys/time.h termios.h unistd.h utmp.h utmpx.h values.h wchar.h wctype.h])
# Checks for typedefs, structures, and compiler characteristics.
AC_CHECK_HEADER_STDBOOL