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Cleanup initialization of jiffies on the Linux platform 

Small cleanups - add error handling, remove a local static
variable and refactor LinuxProcess_adjustTime (also rename
it, as its in LinuxProcessList.c not LinuxProcess.c) - and
while there, move the related 'btime' global variable into
LinuxProcessList.c so it can be made static.

Resolves https://github.com/htop-dev/htop/issues/384
This commit is contained in:
Nathan Scott 2020-12-14 11:19:54 +11:00
parent cf982f2928
commit a3db2da4a7
3 changed files with 15 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
linux/LinuxProcess.c
View File

@ -24,7 +24,6 @@ in the source distribution for its full text.
/* semi-global */
long long btime;
int pageSize;
int pageSizeKB;

2
linux/LinuxProcess.h
View File

@ -191,8 +191,6 @@ static inline bool Process_isUserlandThread(const Process* this) {
return this->pid != this->tgid;
}
extern long long btime;
extern int pageSize;
extern int pageSizeKB;

30
linux/LinuxProcessList.c
View File

@ -63,6 +63,10 @@ in the source distribution for its full text.
# define O_PATH 010000000
#endif
static long long btime;
static long jiffy;
static FILE* fopenat(openat_arg_t openatArg, const char* pathname, const char* mode) {
assert(String_eq(mode, "r")); /* only currently supported mode */
@ -214,6 +218,11 @@ ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* pidMatchList, ui
CRT_fatalError("Cannot get pagesize by sysconf(_SC_PAGESIZE)");
pageSizeKB = pageSize / ONE_K;
// Initialize clock ticks
jiffy = sysconf(_SC_CLK_TCK);
if (jiffy == -1)
CRT_fatalError("Cannot get clock ticks by sysconf(_SC_CLK_TCK)");
// Test /proc/PID/smaps_rollup availability (faster to parse, Linux 4.14+)
this->haveSmapsRollup = (access(PROCDIR "/self/smaps_rollup", R_OK) == 0);
@ -273,16 +282,7 @@ void ProcessList_delete(ProcessList* pl) {
free(this);
}
static inline unsigned long long LinuxProcess_adjustTime(unsigned long long t) {
static long jiffy = -1;
if (jiffy == -1) {
errno = 0;
jiffy = sysconf(_SC_CLK_TCK);
if (errno || -1 == jiffy) {
jiffy = -1;
return t; // Assume 100Hz clock
}
}
static inline unsigned long long LinuxProcessList_adjustTime(unsigned long long t) {
return t * 100 / jiffy;
}
@ -335,13 +335,13 @@ static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd,
location += 1;
lp->cmajflt = strtoull(location, &location, 10);
location += 1;
lp->utime = LinuxProcess_adjustTime(strtoull(location, &location, 10));
lp->utime = LinuxProcessList_adjustTime(strtoull(location, &location, 10));
location += 1;
lp->stime = LinuxProcess_adjustTime(strtoull(location, &location, 10));
lp->stime = LinuxProcessList_adjustTime(strtoull(location, &location, 10));
location += 1;
lp->cutime = LinuxProcess_adjustTime(strtoull(location, &location, 10));
lp->cutime = LinuxProcessList_adjustTime(strtoull(location, &location, 10));
location += 1;
lp->cstime = LinuxProcess_adjustTime(strtoull(location, &location, 10));
lp->cstime = LinuxProcessList_adjustTime(strtoull(location, &location, 10));
location += 1;
process->priority = strtol(location, &location, 10);
location += 1;
@ -351,7 +351,7 @@ static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd,
location += 1;
location = strchr(location, ' ') + 1;
if (process->starttime_ctime == 0) {
process->starttime_ctime = btime + LinuxProcess_adjustTime(strtoll(location, &location, 10)) / 100;
process->starttime_ctime = btime + LinuxProcessList_adjustTime(strtoll(location, &location, 10)) / 100;
} else {
location = strchr(location, ' ') + 1;
}