tests: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Rem

tests: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

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Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Merge ^/head r352764 through r353315.

Fix problems in the kern_maxfiles__increase test

ATF functions such as ATF_REQUIRE do not work correctly in child processes.
Use plain C functions to report errors instead.

In the parent, check for

Fix problems in the kern_maxfiles__increase test

ATF functions such as ATF_REQUIRE do not work correctly in child processes.
Use plain C functions to report errors instead.

In the parent, check for the untimely demise of children. Without this,
the test hung until the framework's timeout.

Raise the resource limit on the number of open files. If this was too low,
the test hit the two problems above.

Restore the kern.maxfiles sysctl OID in the cleanup function.
The body prematurely removed the symlink in which the old value was saved.

Make the test more robust by opening more files. In fact, due to the
integer division by 4, this was necessary to make the test valid with
some initial values of maxfiles. Thanks, asomers@.

wait() for children instead of sleeping.

Clean up a temporary file created by the test ("afile").

Reviewed by: asomers
MFC after: 1 week
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D21900

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kern_descrip_test: Fix trivial buffer overrun with readlink(2)

Reported by: Coverity
CID: 1229965, 1229972
Sponsored by: EMC / Isilon Storage Division

MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

Merge head up to r263906.

Added sysctl kern.maxfiles increase test, do not use /etc/passwd for tests
and use volatile sig_atomic_t for signal handler variable.

Reviewed by: asomers (previous version)
Sponsored by: EMC / Isi

Added sysctl kern.maxfiles increase test, do not use /etc/passwd for tests
and use volatile sig_atomic_t for signal handler variable.

Reviewed by: asomers (previous version)
Sponsored by: EMC / Isilon storage division

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Preserve naming consistency for test cases.

Pointed out by: jmmv
Sponsored by: EMC / Isilon storage division

Changed name of test case to a more descriptive one and moved
comment to the "descr" property.

Suggested by: jmmv
Sponsored by: EMC / Isilon storage division

Merge from head up to r262536.

Added a regression test for r234131.

Discussed with: asomers
Sponsored by: EMC / Isilon storage division