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Linux: document /proc/PID/stat field parsing

This commit is contained in:
Christian Göttsche 2021-01-27 15:12:08 +01:00 committed by BenBE
parent 69efa94f9f
commit 1014e897a7
1 changed files with 47 additions and 6 deletions
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53
linux/LinuxProcessList.c
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@ -291,11 +291,13 @@ static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd,
if (r < 0)
return false;
/* (1) pid - %d */
assert(process->pid == atoi(buf));
char* location = strchr(buf, ' ');
if (!location)
return false;
/* (2) comm - (%s) */
location += 2;
char* end = strrchr(location, ')');
if (!end)
@ -305,61 +307,100 @@ static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd,
location = end + 2;
/* (3) state - %c */
process->state = location[0];
location += 2;
/* (4) ppid - %d */
process->ppid = strtol(location, &location, 10);
location += 1;
/* (5) pgrp - %d */
process->pgrp = strtoul(location, &location, 10);
location += 1;
/* (6) session - %d */
process->session = strtoul(location, &location, 10);
location += 1;
/* (7) tty_nr - %d */
process->tty_nr = strtoul(location, &location, 10);
location += 1;
/* (8) tpgid - %d */
process->tpgid = strtol(location, &location, 10);
location += 1;
/* Skip flags */
/* Skip (9) flags - %u */
location = strchr(location, ' ') + 1;
/* (10) minflt - %lu */
process->minflt = strtoull(location, &location, 10);
location += 1;
/* (11) cminflt - %lu */
lp->cminflt = strtoull(location, &location, 10);
location += 1;
/* (12) majflt - %lu */
process->majflt = strtoull(location, &location, 10);
location += 1;
/* (13) cmajflt - %lu */
lp->cmajflt = strtoull(location, &location, 10);
location += 1;
/* (14) utime - %lu */
lp->utime = LinuxProcessList_adjustTime(strtoull(location, &location, 10));
location += 1;
/* (15) stime - %lu */
lp->stime = LinuxProcessList_adjustTime(strtoull(location, &location, 10));
location += 1;
/* (16) cutime - %ld */
lp->cutime = LinuxProcessList_adjustTime(strtoull(location, &location, 10));
location += 1;
/* (17) cstime - %ld */
lp->cstime = LinuxProcessList_adjustTime(strtoull(location, &location, 10));
location += 1;
/* (18) priority - %ld */
process->priority = strtol(location, &location, 10);
location += 1;
/* (19) nice - %ld */
process->nice = strtol(location, &location, 10);
location += 1;
/* (20) num_threads - %ld */
process->nlwp = strtol(location, &location, 10);
location += 1;
/* Skip (21) itrealvalue - %ld */
location = strchr(location, ' ') + 1;
/* (22) starttime - %llu */
if (process->starttime_ctime == 0) {
process->starttime_ctime = btime + LinuxProcessList_adjustTime(strtoll(location, &location, 10)) / 100;
} else {
location = strchr(location, ' ') + 1;
location = strchr(location, ' ');
}
location += 1;
for (int i = 0; i < 15; i++) {
/* Skip (23) - (38) */
for (int i = 0; i < 16; i++) {
location = strchr(location, ' ') + 1;
}
/* Skip exit_signal */
location = strchr(location, ' ') + 1;
assert(location != NULL);
/* (39) processor - %d */
process->processor = strtol(location, &location, 10);
/* Ignore further fields */
process->time = lp->utime + lp->stime;
return true;