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library: eliminate all dependencies on alloc.h/alloc.c

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While that old master branch library may utilize those
memory allocation functions found in the alloc module,
it was inappropriate for this newlib branch to subject
callers to a stderr message followed by an early exit.

Of course, the old libprocps offered a message handler
override provision (xalloc_err_handler) but that, too,
would seem to be inappropriate for our modern library.

[ remember the battles fought with that damn libnuma ]

So, this commit will tweak those old inherited sources
setting the stage for standardized return values/errno
settings in connection with a memory allocation error.

------------------------------------------------------
Along the way, we'll address the following miscellany:

. Completely eliminate usage of anything from alloc.h.
This, of course, entails our own error checking of the
alternative allocation calls from stdlib.h & string.h.

. Eliminate use of the strdup function where possible,
as with 'procps_uptime' and 'procps_loadavg' routines.

. Whack some obsolete code (getslabinfo) in sysinfo.c.

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2017-11-15 00:00:00 -05:00
committed by Craig Small
parent 2d5b7e580f
commit 18e684d65d
7 changed files with 169 additions and 155 deletions
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9
proc/readproc.h
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@@ -33,7 +33,6 @@ __BEGIN_DECLS
// Most of it comes from task_struct in linux/sched.h
//
typedef struct proc_t {
// 1st 16 bytes
int
tid, // (special) task id, the POSIX thread ID (see also: tgid)
ppid; // stat,status pid of parent process
@@ -46,11 +45,9 @@ typedef struct proc_t {
#endif
pad_2, // n/a padding
pad_3; // n/a padding
// 2nd 16 bytes
unsigned long long
utime, // stat user-mode CPU time accumulated by process
stime, // stat kernel-mode CPU time accumulated by process
// and so on...
cutime, // stat cumulative utime of process and reaped children
cstime, // stat cumulative stime of process and reaped children
start_time, // stat start time of process -- seconds since 1-1-70
@@ -64,7 +61,7 @@ typedef struct proc_t {
#ifdef SIGNAL_STRING
char
// Linux 2.1.7x and up have 64 signals. Allow 64, plus '\0' and padding.
signal[18], // status mask of pending signals, per-task for readtask() but per-proc for readproc()
signal[18], // status mask of pending signals
blocked[18], // status mask of blocked signals
sigignore[18], // status mask of ignored signals
sigcatch[18], // status mask of caught signals
@@ -72,7 +69,7 @@ typedef struct proc_t {
#else
long long
// Linux 2.1.7x and up have 64 signals.
signal, // status mask of pending signals, per-task for readtask() but per-proc for readproc()
signal, // status mask of pending signals
blocked, // status mask of blocked signals
sigignore, // status mask of ignored signals
sigcatch, // status mask of caught signals
@@ -258,7 +255,7 @@ PROCTAB* openproc(unsigned flags, ... /* pid_t*|uid_t*|dev_t*|char* [, int n] */
// with the previous process or thread.
proc_t* readproc(PROCTAB *__restrict const PT, proc_t *__restrict p);
proc_t* readeither(PROCTAB *__restrict const PT, proc_t *__restrict x);
void look_up_our_self(proc_t *p);
int look_up_our_self(proc_t *p);
void closeproc(PROCTAB* PT);
__END_DECLS