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With this change, an alias keyword is resolved once and for all by merging specifications of the keyword (or chain of keywords) it points to. This merge in particular determines the final attributes of the alias keyword, as well as the final keyword it points to, which uniquely determines which information is printed (all non-alias keywords are assumed to display different data). Also, the alias resolving code has been moved into the resolve_alias() function and helpers (e.g., merge_alias()). Aliases are still resolved lazily as needed by default. The new top-level resolve_aliases() function is used to resolve them at once at program startup if ps(1) has been compiled with PS_CHECK_KEYWORDS defined. Else, it can also be called directly from a debugger. This is in preparation for removing columns that actually display the same information in a subsequent commit, as this requires being able to (quickly) determine if they are aliases to each other. *** The merge process is now explicit and more flexible. Previously, all fields of the resolved keyword were unconditionally used for the alias (the pointer to an alias keyword structure was replaced by one to the aliased keyword's one). Now, field 'final_kw' on the alias keyword will store a pointer to the aliased keyword structure (and not only its name, as a subsequent commit will need the structure address). Fields 'header', 'field' and 'flag' are taken from the aliased keyword if they have default values (NULL or 0), else the alias' values prevail. This allows an alias to override one or more of these fields. All fields after 'oproc', because they describe the information to display consistently with each other, are always taken from the aliased keyword. merge_alias() checks that the values of these fields in the alias keyword structure are unspecified (NULL, or some neutral value like 0 and UNSPEC). While here, parsefmt() was reworked to avoid any direct recursion and the break-up/recombination steps that were used when processing aliases. The latter was due to the mutual recursion with findvar() and its odd-for-that-purpose signature. findvar() has been removed in the process. Simplification of parsefmt() also allows to be more precise with the errors reported (in particular, the case of an empty keyword with a specific header would just be reported as a "keyword not found" message). While here, introduce the check_keywords() function, performing sanity checks on the declared keywords, currently only validating that they are declared in alphabetical order. As for resolve_aliases(), this function is called at startup on PS_CHECK_KEYWORDS, else it is available to be called from a debugger. Ideally, alias resolution should be done at compile time. In practice, it seems doing so at runtime was never a problem (there are only a few aliases compared to all available keywords, and there's currently at most one level of aliasing). With the changes here, it seems very unlikely to become one even if many more keywords, aliases or aliasing levels are added. MFC after: 3 days Sponsored by: The FreeBSD Foundation
10 lines
175 B
Makefile
10 lines
175 B
Makefile
PACKAGE=runtime
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PROG= ps
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SRCS= fmt.c keyword.c nlist.c print.c ps.c
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LIBADD= m kvm jail xo
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.ifdef PS_CHECK_KEYWORDS
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CFLAGS+=-DPS_CHECK_KEYWORDS
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.endif
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.include <bsd.prog.mk>
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