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Introduce IN_SET() macro to nicely check whether a value a is one of a
few listed values.
This makes writing this:
if (a == 1 || a == 7 || a == 8 || a == 9)
nicer, by allowing this:
if (IN_SET(a, 1, 7, 8, 9))
This is particularly useful for state machine enums.
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We expect the event on /proc/swaps before we expect the SIGCHILD,
reflect this in the state machine.
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David:
I already applied a fix for that, but this patch definitely looks nicer. I
changed CONCATENATE_HELPER() -> XCONCATENATE() similar to XSTRINGIFY and
added the UNIQUE() helper.
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We need two-level macro-expansion, otherwise __LINE__ will not get
evaluated.
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As the name indicates assert_return() is really just for assertions,
i.e. where it's a programming error if the assertion does not hold.
Hence it is safe to add _unlikely_() decorators for the expression to
check.
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Always use our own macros, and name all our own macros the same style.
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For the library functions we expose we currently repeatedly use checks
like the following:
if (!value_is_ok(parameter1))
return -EINVAL;
if (!value_is_ok(parameter2))
return -EINVAL;
And so on. Let's turn this into a macro:
assert_return(value_is_ok(parameter1), -EINVAL);
assert_return(value_is_ok(paramater2), -EINVAL);
This makes our code a bit shorter and simpler, and also allows us to add
a _unlikely_() around the check.
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It is imperative that open source code be well attributed.
Sprinkle attribute((alloc_size)) here and there, telling gcc
how much memory we are actually allocating.
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This reverts commit 4826f0b7b5c0aefa08b8cc7ef64d69027f84da2c.
Because statfs.t_type can be int on some architecures, we have to cast
the const magic to the type, otherwise the compiler warns about
signed/unsigned comparison, because the magic can be 32 bit unsigned.
statfs(2) man page is also wrong on some systems, because
f_type is not __SWORD_TYPE on some architecures.
The following program:
int main(int argc, char**argv)
{
struct statfs s;
statfs(argv[1], &s);
printf("sizeof(f_type) = %d\n", sizeof(s.f_type));
printf("sizeof(__SWORD_TYPE) = %d\n", sizeof(__SWORD_TYPE));
printf("sizeof(long) = %d\n", sizeof(long));
printf("sizeof(int) = %d\n", sizeof(int));
if (sizeof(s.f_type) == sizeof(int)) {
printf("f_type = 0x%x\n", s.f_type);
} else {
printf("f_type = 0x%lx\n", s.f_type);
}
return 0;
}
executed on s390x gives for a btrfs:
sizeof(f_type) = 4
sizeof(__SWORD_TYPE) = 8
sizeof(long) = 8
sizeof(int) = 4
f_type = 0x9123683e
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This reverts commit a858b64dddf79177e12ed30f5e8c47a1471c8bfe.
This reverts commit aea275c43194b6ac519ef907b62c5c995050fde0.
This reverts commit fc6e6d245ee3989c222a2a8cc82a33475f9922f3.
This reverts commit c4073a27c555aeceac87a3b02a83141cde641a1e.
This reverts commit cddf148028f525be8176e7f1cbbf4f862bd287f6.
This reverts commit 8c68a70170b31f93c287f29fd06c6c17edaf19ad.
The constants are now casted to __SWORD_TYPE, which should resolve the
compiler warnings about signed vs unsigned.
After talking to Kay, we concluded:
This should be fixed in the kernel, not worked around in userspace tools.
Architectures cannot use int and expect magic constants lager than INT_MAX
to work correctly. The kernel header needs to be fixed.
Even coreutils cannot handle it:
#define RAMFS_MAGIC 0x858458f6
# stat -f -c%t /
ffffffff858458f6
#define BTRFS_SUPER_MAGIC 0x9123683E
# stat -f -c%t /mnt
ffffffff9123683e
Although I found the perfect working macro to fix the thing :)
__extension__ ({ \
bool _ret = false; \
switch(f) { case c: _ret=true; }; \
( _ret ); \
})
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const
If the magic parameter is not a const, then the macro does not work, so
better fail to compile, than be surprised afterwards.
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On some architectures (like s390x) the kernel has the type int for
f_type, but long in userspace.
Assigning the 32 bit magic constants from linux/magic.h to the 31 bit
signed f_type in the kernel, causes f_type to be negative for some
constants.
glibc extends the int to long for those architecures in 64 bit mode, so
the negative int becomes a negative long, which cannot be simply
compared to the original magic constant, because the compiler would
automatically cast the constant to long.
To workaround this issue, we also compare to the (int)MAGIC value in a
macro. Of course, we could do #ifdef with the architecure, but it has to
be maintained, and the magic constants are 32 bit anyway.
Someday, when the int is unsigned or long for all architectures, we can
remove this macro again. Until then, keep it as simple as it can be.
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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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If we pass a constant value to ALIGN() gcc should have the chance to
calculate the value during compilation rather than runtime, so let's
avoid a static inline call if we can.
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formatting of a numeric type
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code in src/shared/macro.h only defined MAX/MIN in case
they were not defined previously. however the MAX/MIN
macros implemented in glibc are not of the "safe" kind but defined
as:
define MIN(a,b) (((a)<(b))?(a):(b))
define MAX(a,b) (((a)>(b))?(a):(b))
Avoid nasty side effects by using our own versions instead.
Also fix the warnings derived from this change.
[zj: - modify MAX3 macro to fix warning about _a shadowing _a,
- do bootchart/svg.c too,
- remove unused MIN3.]
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To make the result more visible, special return value
is used to tell automake that the test was skipped. While
at it, use the same return value in other skipped tests.
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library
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Based-on-patch-by: Thomas Jarosch <thomas.jarosch@intra2net.com>
cppcheck reported:
[src/bootchart/svg.c:791]: (error) Mismatching allocation and deallocation: f
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set_freep() is added to automatize set_free().
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Much like logind has a client in loginctl, and journald in journalctl
introduce timedatectl, to change the system time (incl. RTC), timezones
and related settings.
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https://bugs.freedesktop.org/show_bug.cgi?id=55213
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Just trying to get the feel for it. And it's pretty cool.
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and make use of it
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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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On Sun, Jul 15, 2012 at 2:00 PM, Koen Kooi <koen@dominion.thruhere.net> wrote:
> | src/journal/sd-journal.c: In function 'sd_journal_process':
> | src/journal/sd-journal.c:1891:21: warning: cast increases required alignment of target type [-Wcast-align]
> | src/journal/sd-journal.c:1900:29: warning: cast increases required alignment of target type [-Wcast-align]
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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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