unix: Add PIPE_BUF for bsd and notbsd

This is the maximum size of guaranteed-atomic writes to a pipe.

This is the maximum size of guaranteed-atomic writes to a pipe.

Adding syslog functions, constants and structs

This commit adds the functions:-
- syslog
- openlog
- closelog
- setlogmask

It adds LOG_* constants.

It adds the `CODE` struct used by the `#define` definitions `prioritynames` and `facilitynames`.

It does not add:-
- the function `vsyslog`; this is an extension to POSIX and uses va_list macros;
- the `#define`s `prioritynames` and `facilitynames`, as usage is not common
- rust functions mirroring the macros:-
  - LOG_PRI
  - LOG_MAKEPRI
  - LOG_MASK
  - LOG_UPTO
  - LOG_FAC
* `CODE` is included in case a third-party unsafe C function returns or takes it.

Did this by moving these definitions up from DragonFlyBSD.

This is because Android bionic doesn't support `LOG_NFEATURES`.

Removed CODE, as its definition and name varies too wildy and I
have no current code using it to test permutations with.

Moved LOG_NFACILITIES down, as Mac OS X defines this value
differently.

Added Mac OS X specific LOG_* facilities.

Added FreeBSD / DragonFly BSD specific LOG_* facilities.

Moved LOG_PERROR down, as all platforms bar Solaris define this.

Moved LOG_CRON down, as Solaris defines this with a different value.

Moved LOG_AUTHPRIV and LOG_FTP down, as all platforms bar Solaris
define these.

Looks like Solaris is suffering from the bit rot of commercial Unix...

Added strnlen function to all platforms.

strnlen is used to find the length of a C string that may be
lacking a terminal NUL character. Whilst it is possible to
implement the equivalent functionality in rust code, it is
cleaner, simpler and removes the need for duplication of tricky
functionality to get right. It also makes it easier to port
C code snippets to rust. In my case, it's needed for dealing with
the result of `gethostname`.

Note that strnlen is not part of POSIX or C99, but is present on all major platforms.

Definition of _SC_HOST_NAME_MAX for OpenBSD and FreeBSD

strnlen is used to find the length of a C string that may be
lacking a terminal NUL character. Whilst it is possible to
implement the equivalent functionality in rust code, it is
cleaner, simpler and removes the need for duplication of tricky
functionality to get right. It also makes it easier to port
C code snippets to rust.

Note that strnlen is not part of POSIX or C99.

Added _SC_HOST_NAME_MAX for FreeBSD, DragonFly, BitRig and Linux (glibc and musl)

I'd have liked to also add NetBSD and OpenBSD, but I can't find where _SC_HOST_NAME_MAX is defined.

This commit adds the functions:-
- syslog
- openlog
- closelog
- setlogmask

It adds LOG_* constants.

It adds the CODE struct used by the #define definitions prioritynames and facilitynames.

It does not add:-
- the function vsyslog; this is an extension to POSIX and uses va_list macros;
- the #defines prioritynames and facilitynames, as usage is not common
- rust functions mirroring the macros:-
  - LOG_PRI
  - LOG_MAKEPRI
  - LOG_MASK
  - LOG_UPTO
  - LOG_FAC
* CODE is included in case a third-party unsafe C function returns or takes it.

Bump to 0.2.11

Closes #273

apple: Add RLIMIT_RSS as alias of RLIMIT_AS

This is defined in <sys/resource.h> as

    #define	RLIMIT_RSS	RLIMIT_AS	/* source compatibility alias */

See http://opensource.apple.com//source/xnu/xnu-1456.1.26/bsd/sys/resource.h

This is defined in <sys/resource.h> as

    #define	RLIMIT_RSS	RLIMIT_AS	/* source compatibility alias */

See http://opensource.apple.com//source/xnu/xnu-1456.1.26/bsd/sys/resource.h

OS X: add various process status tests defined by wait.h

Adds the various process test macros specified in the wait(2) manpage on OS X. ```WCOREDUMP``` is implemented BSD-wide as it seems to be the only macro whose definition is constant across the BSDs.

linux: Add prlimit(2) and prlimit64(2)

As with `getrlimit` and `setrlimit`, the glibc wrappers have a non-`int`
for the `resource` argument, eg:

    extern int prlimit (__pid_t __pid, enum __rlimit_resource __resource,
                        const struct rlimit *__new_limit,
                        struct rlimit *__old_limit) __THROW;

As with `getrlimit` and `setrlimit`, the glibc wrappers have a non-`int`
for the `resource` argument, eg:

    extern int prlimit (__pid_t __pid, enum __rlimit_resource __resource,
                        const struct rlimit *__new_limit,
                        struct rlimit *__old_limit) __THROW;

notbsd: Deduplicate definitions

A bunch of definitions were duplicated across, eg, android and linux.
This commit pulls these up to higher levels where they can be shared.

Add SIGEMT (for apple) and SIGINFO (for bsd).

Explain about the automated tests on Travis

in order to advise contributors to locally test their patches.

A bunch of definitions were duplicated across, eg, android and linux.
This commit pulls these up to higher levels where they can be shared.

in order to advise contributors to locally test their patches.

Also update ctest to include a fix on rerun-if-changed so that human
developers doing trial & error can properly test their latest code.

Signed-off-by: NODA, Kai <nodakai@gmail.com>

Use rustup to add targets, not manual curl

Add support for arm-unknown-linux-musleabi{,hf} targets.

These targets will be similar to the x86_64-unknown-linux-musl
target, in that they'll use MUSL libc to allow fully static binaries
to be generated. To remain consistent with the naming of existing
ARM targets, as well as with the standard naming of MUSL toolchains,
we'll use `musleabi` and `musleabihf` as the target environment
names (analogous to `gnueabi` and `gnueabihf`).

Most of these changes just extend the special casing for x86_64 MUSL
targets to the ARM ones as well.

These targets will be similar to the x86_64-unknown-linux-musl
target, in that they'll use MUSL libc to allow fully static binaries
to be generated. To remain consistent with the naming of existing
ARM targets, as well as with the standard naming of MUSL toolchains,
we'll use `musleabi` and `musleabihf` as the target environment
names (analogous to `gnueabi` and `gnueabihf`).

Most of these changes just extend the special casing for x86_64 MUSL
targets to the ARM ones as well.

Add ucontext for linux-musl.

It just copy pasted from the linux-other version.

Add the family of printf, scanf functions

snprintf is apparently supported in MSVC since version 14. I'm curious to take the tests for a spin.