apachectl and into a separate environment variable file which
can be more easily tailored by the admin. The environment
variable file as built by Apache may have additional system-
specific settings. For example, on OS/390 we tailor the heap
settings to allow lots of threads.
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directories that are not well known to the loader.
How it works:
* libtool figures out the name of this system's library path environment
variable (i.e. LD_LIBRARY_PATH, LIBPATH, DYLD_LIBRARY_PATH) at apr
configure time (existing code)
* save this variable name in SHLIBPATH_VAR in APRVARS
* substitute this name when apachectl is created
* uncomment the lines containing this variable during binbuild
* install_bindist.sh updates the path to lib/ when the binary is
installed (existing code)
not done yet, but a good idea:
* create a file or directory containing all environment variable settings
for apachectl. Others env vars need to be tweaked, at least on AIX and
OS/390, so keeping them separate should reduce headaches long term.
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(apachectl graceful was broken.)
The best way to do this is to change configure to internally represent
the signal without the SIG prefix and prepend SIG before substitution
(and export a version without the SIG prefix for apachectl).
This highlights why we want to move apachectl's core functionality into
httpd.
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support it. This defines a symbol called AP_SIG_GRACEFUL in
ap_config_auto.h which will have the appropriate signal value. All
direct references to SIGWINCH have been replaced with AP_SIG_GRACEFUL.
On Linux 2.0, use SIGWINCH instead since SIGUSR1 is used by glibc
2.0's user-space threading library to control threads. All later
versions of Linux/glibc don't have this problem. (Not to mention the
security holes in older Linux versions which make it unsuitable for
use as a web server.) If your platform doesn't have SIGUSR1, use the
appropriate mojo in configure to define what your graceful restart
signal should be.
In theory, a configure switch could be added to allow the admin to
specify the appropriate signal that should be used. This is left
as an exercise to the reader for now.
The docs need to be updated. Since the signal is now configurable,
just saying SIGUSR1 for graceful restart isn't completely true. Also,
the apachectl functionality needs to be moved into httpd - this is
what Win32 does and it makes us consistent across platforms.
Roy issued a veto against use of SIGWINCH by default, so this should
resolve that veto.
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