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It cannot fail in the current hashmap implementation, but it may fail in
alternative implementations (unless a sufficiently large reservation has
been placed beforehand).
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With the current hashmap implementation that uses chaining, placing a
reservation can serve two purposes:
- To optimize putting of entries if the number of entries to put is
known. The reservation allocates buckets, so later resizing can be
avoided.
- To avoid having very long bucket chains after using
hashmap_move(_one).
In an alternative hashmap implementation it will serve an additional
purpose:
- To guarantee a subsequent hashmap_move(_one) will not fail with
-ENOMEM (this never happens in the current implementation).
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The following hashmap_* and set_* functions/macros have never had any
users in systemd's history:
*_iterate_backwards
*_iterate_skip
*_last
*_FOREACH_BACKWARDS
Remove this dead code.
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It is redundant to store 'hash' and 'compare' function pointers in
struct Hashmap separately. The functions always comprise a pair.
Store a single pointer to struct hash_ops instead.
systemd keeps hundreds of hashmaps, so this saves a little bit of
memory.
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Emacs C indenting really gets confused by these lines if they carry no
trailing semicolon, hence let's make this nicer for good old emacs. The
other macros which define functions already do this too, so let's copy
the scheme here.
Also, let's use an uppercase name for the macro. So far our rough rule
was that macros that are totally not function-like (like this ones,
which define a function) are uppercase. (Well, admittedly it is a rough
rule only, for example function and variable decorators are all
lower-case SINCE THE CONSTANT YELLING IN THE SOURCES WOULD SUCK, and
also they at least got underscore prefixes.) Also, the macros that
define functions that we already have are all uppercase, so let's do the
same here...
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Freeing in error path is the common pattern with set_put().
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There's now a generic _cleanup_ macro with an argument. The macros for
specific types are now defined using this macro, and in the header files
where they belong.
All cleanup handlers are now inline functions.
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set_freep() is added to automatize set_free().
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In some cases, like wrong configuration, restarting after error
does not help, so administrator can specify statuses by RestartPreventExitStatus
which will not cause restart of a service.
Sometimes you have non-standart exit status, so this can be specified
by SuccessfulExitStatus.
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#pragma once has been "un-deprecated" in gcc since 3.3, and is widely supported
in other compilers.
I've been using and maintaining (rebasing) this patch for a while now, as
it annoyed me to see #ifndef fooblahfoo, etc all over the place,
almost arrogant about the annoyance of having to define all these names to
perform a commen but neccicary functionality, when a completely superior
alternative exists.
I havn't sent it till now, cause its kindof a style change, and it is bad
voodoo to mess with style that has been established by more established
editors. So feel free to lambast me as a crazy bafoon.
v2 - preserve externally used headers
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We finally got the OK from all contributors with non-trivial commits to
relicense systemd from GPL2+ to LGPL2.1+.
Some udev bits continue to be GPL2+ for now, but we are looking into
relicensing them too, to allow free copy/paste of all code within
systemd.
The bits that used to be MIT continue to be MIT.
The big benefit of the relicensing is that closed source code may now
link against libsystemd-login.so and friends.
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internal libraries
Before:
$ ldd /lib/systemd/systemd-timestamp
linux-vdso.so.1 => (0x00007fffb05ff000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f90aac57000)
libcap.so.2 => /lib64/libcap.so.2 (0x00007f90aaa53000)
librt.so.1 => /lib64/librt.so.1 (0x00007f90aa84a000)
libc.so.6 => /lib64/libc.so.6 (0x00007f90aa494000)
/lib64/ld-linux-x86-64.so.2 (0x00007f90aae90000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f90aa290000)
libattr.so.1 => /lib64/libattr.so.1 (0x00007f90aa08a000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f90a9e6e000)
After:
$ ldd systemd-timestamp
linux-vdso.so.1 => (0x00007fff3cbff000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f5eaa1c3000)
librt.so.1 => /lib64/librt.so.1 (0x00007f5ea9fbb000)
libc.so.6 => /lib64/libc.so.6 (0x00007f5ea9c04000)
/lib64/ld-linux-x86-64.so.2 (0x00007f5eaa3fc000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f5ea9a00000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f5ea97e4000)
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