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Process: drop commLen

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It is only used on Linux to optimize memory handling in case the command
changes to a smaller-or-equal string.

This "optimization" however causes more code bloat and maintenance cost
on string handling issues than it gains.
This commit is contained in:
Christian Göttsche 2021-01-05 14:53:07 +01:00 committed by BenBE
parent 70f48f1f44
commit d9240999e9
3 changed files with 7 additions and 25 deletions
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1
Process.h
View File

@ -66,7 +66,6 @@ typedef struct Process_ {
pid_t ppid;
pid_t tgid;
char* comm; /* use Process_getCommand() for Command actually displayed */
int commLen;
int indent;
int basenameOffset;

30
linux/LinuxProcessList.c
View File

@ -281,10 +281,8 @@ static inline unsigned long long LinuxProcessList_adjustTime(unsigned long long
return t * 100 / jiffy;
}
static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd, char* command, int* commLen) {
static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd, char* command, size_t commLen) {
LinuxProcess* lp = (LinuxProcess*) process;
const int commLenIn = *commLen;
*commLen = 0;
char buf[MAX_READ + 1];
ssize_t r = xReadfileat(procFd, "stat", buf, sizeof(buf));
@ -301,11 +299,8 @@ static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd,
if (!end)
return false;
int commsize = MINIMUM(end - location, commLenIn - 1);
// deepcode ignore BufferOverflow: commsize is bounded by the allocated length passed in by commLen, saved into commLenIn
memcpy(command, location, commsize);
command[commsize] = '\0';
*commLen = commsize;
String_safeStrncpy(command, location, MINIMUM((size_t)(end - location + 1), commLen));
location = end + 2;
process->state = location[0];
@ -987,16 +982,6 @@ delayacct_failure:
#endif
static void setCommand(Process* process, const char* command, int len) {
if (process->comm && process->commLen >= len) {
strncpy(process->comm, command, len + 1);
} else {
free(process->comm);
process->comm = xStrdup(command);
}
process->commLen = len;
}
static bool LinuxProcessList_readCmdlineFile(Process* process, openat_arg_t procFd) {
char command[4096 + 1]; // max cmdline length on Linux
ssize_t amtRead = xReadfileat(procFd, "cmdline", command, sizeof(command));
@ -1126,7 +1111,7 @@ static bool LinuxProcessList_readCmdlineFile(Process* process, openat_arg_t proc
lp->mergedCommand.maxLen = lastChar + 1; /* accommodate cmdline */
if (!process->comm || !String_eq(command, process->comm)) {
process->basenameOffset = tokenEnd;
setCommand(process, command, lastChar + 1);
free_and_xStrdup(&process->comm, command);
lp->procCmdlineBasenameOffset = tokenStart;
lp->procCmdlineBasenameEnd = tokenEnd;
lp->mergedCommand.cmdlineChanged = true;
@ -1356,9 +1341,8 @@ static bool LinuxProcessList_recurseProcTree(LinuxProcessList* this, openat_arg_
char command[MAX_NAME + 1];
unsigned long long int lasttimes = (lp->utime + lp->stime);
int commLen = sizeof(command);
unsigned int tty_nr = proc->tty_nr;
if (! LinuxProcessList_readStatFile(proc, procFd, command, &commLen))
if (! LinuxProcessList_readStatFile(proc, procFd, command, sizeof(command)))
goto errorReadingProcess;
if (tty_nr != proc->tty_nr && this->ttyDrivers) {
@ -1446,11 +1430,11 @@ static bool LinuxProcessList_recurseProcTree(LinuxProcessList* this, openat_arg_
if (proc->state == 'Z' && (proc->basenameOffset == 0)) {
proc->basenameOffset = -1;
setCommand(proc, command, commLen);
free_and_xStrdup(&proc->comm, command);
} else if (Process_isThread(proc)) {
if (settings->showThreadNames || Process_isKernelThread(proc)) {
proc->basenameOffset = -1;
setCommand(proc, command, commLen);
free_and_xStrdup(&proc->comm, command);
} else if (settings->showThreadNames) {
if (! LinuxProcessList_readCmdlineFile(proc, procFd)) {
goto errorReadingProcess;

1
solaris/SolarisProcessList.c
View File

@ -351,7 +351,6 @@ int SolarisProcessList_walkproc(psinfo_t* _psinfo, lwpsinfo_t* _lwpsinfo, void*
sproc->zname = SolarisProcessList_readZoneName(spl->kd, sproc);
proc->user = UsersTable_getRef(pl->usersTable, proc->st_uid);
proc->comm = xStrdup(_psinfo->pr_fname);
proc->commLen = strnlen(_psinfo->pr_fname, PRFNSZ);
}
// End common code pass 1