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Reuse comm object if possible, avoid useless repetitions of free+strdup.

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This commit is contained in:
Hisham 2016-02-02 15:56:52 +01:00
parent 301c346c85
commit 1cfcc42a8f
3 changed files with 19 additions and 8 deletions
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1
Process.c
View File

@ -88,6 +88,7 @@ typedef struct Process_ {
pid_t ppid;
pid_t tgid;
char* comm;
int commLen;
int indent;
int basenameOffset;

1
Process.h
View File

@ -68,6 +68,7 @@ typedef struct Process_ {
pid_t ppid;
pid_t tgid;
char* comm;
int commLen;
int indent;
int basenameOffset;

25
linux/LinuxProcessList.c
View File

@ -149,7 +149,7 @@ static inline unsigned long long LinuxProcess_adjustTime(unsigned long long t) {
return (unsigned long long) t * jiffytime * 100;
}
static bool LinuxProcessList_readStatFile(Process *process, const char* dirname, const char* name, char* command) {
static bool LinuxProcessList_readStatFile(Process *process, const char* dirname, const char* name, char* command, int* commLen) {
LinuxProcess* lp = (LinuxProcess*) process;
char filename[MAX_NAME+1];
snprintf(filename, MAX_NAME, "%s/%s/stat", dirname, name);
@ -175,6 +175,7 @@ static bool LinuxProcessList_readStatFile(Process *process, const char* dirname,
int commsize = end - location;
memcpy(command, location, commsize);
command[commsize] = '\0';
*commLen = commsize;
location = end + 2;
process->state = location[0];
@ -444,6 +445,16 @@ static void LinuxProcessList_readOomData(LinuxProcess* process, const char* dirn
fclose(file);
}
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, const char* dirname, const char* name) {
if (Process_isKernelThread(process))
return true;
@ -471,9 +482,8 @@ static bool LinuxProcessList_readCmdlineFile(Process* process, const char* dirna
tokenEnd = amtRead;
}
command[amtRead] = '\0';
free(process->comm);
process->comm = strdup(command);
process->basenameOffset = tokenEnd;
setCommand(process, command, amtRead);
return true;
}
@ -539,7 +549,8 @@ static bool LinuxProcessList_recurseProcTree(LinuxProcessList* this, const char*
char command[MAX_NAME+1];
unsigned long long int lasttimes = (lp->utime + lp->stime);
if (! LinuxProcessList_readStatFile(proc, dirname, name, command))
int commLen = 0;
if (! LinuxProcessList_readStatFile(proc, dirname, name, command, &commLen))
goto errorReadingProcess;
if (settings->flags & PROCESS_FLAG_LINUX_IOPRIO)
LinuxProcess_updateIOPriority(lp);
@ -589,14 +600,12 @@ static bool LinuxProcessList_recurseProcTree(LinuxProcessList* this, const char*
LinuxProcessList_readOomData(lp, dirname, name);
if (proc->state == 'Z') {
free(proc->comm);
proc->basenameOffset = -1;
proc->comm = strdup(command);
setCommand(proc, command, commLen);
} else if (Process_isThread(proc)) {
if (settings->showThreadNames || Process_isKernelThread(proc) || proc->state == 'Z') {
free(proc->comm);
proc->basenameOffset = -1;
proc->comm = strdup(command);
setCommand(proc, command, commLen);
} else if (settings->showThreadNames) {
if (! LinuxProcessList_readCmdlineFile(proc, dirname, name))
goto errorReadingProcess;