tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.

bus-error: verify additional error maps during installation Go over the entries in the map and check that they make sense. Tests are added. In the future we might want to do additional checks, e.g. verifying that the error names are in the expected format.

basic,bus-error: return negative error from errno_from_name errno_from_name used an unusual return convention where 0 meant "not found". This tripped up config_parse_syscall_errno(), which would treat that as success. Return -EINVAL instead, and adjust bus_error_name_to_errno() for the new convention. Also remove a goto which was used as a simple if and clean up surroudning code a bit.

tree-wide: sort includes Sort the includes accoding to the new coding style.

doc: correct punctuation and improve typography in documentation

util-lib: split out allocation calls into alloc-util.[ch]

util-lib: split our string related calls from util.[ch] into its own file string-util.[ch] There are more than enough calls doing string manipulations to deserve its own files, hence do something about it. This patch also sorts the #include blocks of all files that needed to be updated, according to the sorting suggestions from CODING_STYLE. Since pretty much every file needs our string manipulation functions this effectively means that most files have sorted #include blocks now. Also touches a few unrelated include files.

build-sys: hide magic section variables from exported symbols https://github.com/systemd/systemd/issues/234

tree-wide: there is no ENOTSUP on linux Replace ENOTSUP by EOPNOTSUPP as this is what linux actually uses.

sd-bus: export sd_bus_error_set_errnofv()

libsystemd: Fix minor typo in comment

sd-bus: move common errors src/shared/bus-errors.h → src/libsystemd/sd-bus/bus-common-errors.h Stuff in src/shared/ should not use stuff from src/libsystemd/ really.

sd-bus: rework ELF error mapping table magic The ELF magic cannot work for consumers of our shard library, since they are in a different module. Hence make all the ELF magic private, and instead introduce a public function to register additional static mapping table.

sd-bus: make sure %m resolves to the specified error in bus_error_set_errnofv()

Make bus errno mappings non-static __attribute__((used)) is not enough to force static variables to be carried over to a compiled program from a library. Mappings defined in libsystemd-shared.a were not visible in the compiled binaries. To ensure that the mappings are present in the final binary, the tables are made non-static and are given a real unique name by which they can be referenced. To use a mapping defined not in the local compilation unit (e.g. in a library) a reference to the mapping table is added. This is done by including a declaration in the header file. Expected values in test-engine are fixed to reflect the new mappings.

bus: do not segfault on zeros in errno mapping table Depending on the link order, holes might appear in the body of the sd_bus_errnomap section. Ignore them. Adds a simple test to print the table to help with debugging such issues in the future.

bus: add sd_bus_errnomap section This allows custom "name" ↔ errno mappings to be registered. Tables from all compilation units are concatenated.

sd-bus: if we don't manage to properly allocate the error message for an sd_bus_error, just go on sd_bus_error_setfv() must initialize the sd_bus_error value to some sensible value and then return a good errno code matching that. If it cannot work at all it should set the error statically to the OOM error. But if it can work half-way (i.e. initialize the name, but not the message) it should do so and still return the correct errno number for it. This effectively reverts 8bf13eb1e02b9977ae1cd331ae5dc7305a305a09

sd-bus: check return value of vasprintf Check for OOM situations when vasprintf() returns < 0 in bus_error_setfv(). Spotted by coverity.

bus: remove unused check strerror_r does not return null here and even if it did we would have problems already at the preceding strlen call. Found by coverity. Fixes: CID#1237770

libsystemd: split up into subdirs We still only produce on .so, but let's keep the sources separate to make things a bit less messy.