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library: tweak 'other' user/group names for efficiency

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This commit just ensures that the relatively expensive
ID to name conversions aren't performed unless they're
explicitly requested. It also internalizes those flags
that required the PROC_FILLSTATUS flag to also be set.

[ requiring a caller, in our case pids.c, to provide ]
[ two flags when a single field was the objective is ]
[ wrong & represents a future potential toe-stubber. ]

[ moreover, what's worse is that those two flags are ]
[ seemingly unrelated. but, without both, a SEGV can ]
[ can be expected when a result.str pointer is NULL. ]

[ by contrast, in the master branch those fields are ]
[ arrays which, when set to zeroes, produce an empty ]
[ string. So, there is no abend (but no name either) ]
[ when one of those two required flags were omitted. ]

[ and worth noting, in that branch it's not just one ]
[ caller required to observe a two flag requirement. ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2021-02-02 00:00:00 -06:00
committed by Craig Small
parent 4770195b87
commit 3c87c46439
3 changed files with 35 additions and 41 deletions
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6
proc/readproc.h
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@@ -207,7 +207,6 @@ typedef struct PROCTAB {
#define PROC_FILLSTATUS 0x0020 // read status
#define PROC_FILLSTAT 0x0040 // read stat
#define PROC_FILLCGROUP 0x0200 // alloc and fill in `cgroup` vectors
#define PROC_FILLSUPGRP 0x0400 // resolve supplementary group id -> group name
#define PROC_FILLOOM 0x0800 // fill in proc_t oom_score and oom_adj
#define PROC_FILLNS 0x8000 // fill in proc_t namespace information
#define PROC_FILLSYSTEMD 0x80000 // fill in proc_t systemd information
@@ -224,6 +223,11 @@ typedef struct PROCTAB {
#define PROC_EDITCMDLCVT 0x20000 // edit `cmdline' as regular string
#define PROC_EDITENVRCVT 0x40000 // edit `environ' as regular string
// these three also require the PROC_FILLSTATUS flage
#define PROC_FILL_OUSERS ( 0x0080 | PROC_FILLSTATUS ) // obtain other user names
#define PROC_FILL_OGROUPS ( 0x0100 | PROC_FILLSTATUS ) // obtain other group names
#define PROC_FILL_SUPGRP ( 0x0400 | PROC_FILLSTATUS ) // obtain supplementary group names
// it helps to give app code a few spare bits
#define PROC_SPARE_1 0x01000000
#define PROC_SPARE_2 0x02000000