mirror of https://github.com/xzeldon/htop.git
Process: drop commLen
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.
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@ -66,7 +66,6 @@ typedef struct Process_ {
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pid_t ppid;
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pid_t tgid;
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char* comm; /* use Process_getCommand() for Command actually displayed */
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int commLen;
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int indent;
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int basenameOffset;
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@ -281,10 +281,8 @@ static inline unsigned long long LinuxProcessList_adjustTime(unsigned long long
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return t * 100 / jiffy;
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}
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static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd, char* command, int* commLen) {
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static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd, char* command, size_t commLen) {
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LinuxProcess* lp = (LinuxProcess*) process;
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const int commLenIn = *commLen;
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*commLen = 0;
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char buf[MAX_READ + 1];
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ssize_t r = xReadfileat(procFd, "stat", buf, sizeof(buf));
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@ -301,11 +299,8 @@ static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd,
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if (!end)
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return false;
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int commsize = MINIMUM(end - location, commLenIn - 1);
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// deepcode ignore BufferOverflow: commsize is bounded by the allocated length passed in by commLen, saved into commLenIn
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memcpy(command, location, commsize);
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command[commsize] = '\0';
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*commLen = commsize;
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String_safeStrncpy(command, location, MINIMUM((size_t)(end - location + 1), commLen));
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location = end + 2;
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process->state = location[0];
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@ -987,16 +982,6 @@ delayacct_failure:
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#endif
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static void setCommand(Process* process, const char* command, int len) {
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if (process->comm && process->commLen >= len) {
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strncpy(process->comm, command, len + 1);
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} else {
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free(process->comm);
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process->comm = xStrdup(command);
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}
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process->commLen = len;
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}
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static bool LinuxProcessList_readCmdlineFile(Process* process, openat_arg_t procFd) {
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char command[4096 + 1]; // max cmdline length on Linux
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ssize_t amtRead = xReadfileat(procFd, "cmdline", command, sizeof(command));
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@ -1126,7 +1111,7 @@ static bool LinuxProcessList_readCmdlineFile(Process* process, openat_arg_t proc
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lp->mergedCommand.maxLen = lastChar + 1; /* accommodate cmdline */
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if (!process->comm || !String_eq(command, process->comm)) {
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process->basenameOffset = tokenEnd;
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setCommand(process, command, lastChar + 1);
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free_and_xStrdup(&process->comm, command);
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lp->procCmdlineBasenameOffset = tokenStart;
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lp->procCmdlineBasenameEnd = tokenEnd;
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lp->mergedCommand.cmdlineChanged = true;
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@ -1356,9 +1341,8 @@ static bool LinuxProcessList_recurseProcTree(LinuxProcessList* this, openat_arg_
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char command[MAX_NAME + 1];
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unsigned long long int lasttimes = (lp->utime + lp->stime);
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int commLen = sizeof(command);
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unsigned int tty_nr = proc->tty_nr;
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if (! LinuxProcessList_readStatFile(proc, procFd, command, &commLen))
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if (! LinuxProcessList_readStatFile(proc, procFd, command, sizeof(command)))
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goto errorReadingProcess;
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if (tty_nr != proc->tty_nr && this->ttyDrivers) {
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@ -1446,11 +1430,11 @@ static bool LinuxProcessList_recurseProcTree(LinuxProcessList* this, openat_arg_
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if (proc->state == 'Z' && (proc->basenameOffset == 0)) {
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proc->basenameOffset = -1;
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setCommand(proc, command, commLen);
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free_and_xStrdup(&proc->comm, command);
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} else if (Process_isThread(proc)) {
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if (settings->showThreadNames || Process_isKernelThread(proc)) {
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proc->basenameOffset = -1;
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setCommand(proc, command, commLen);
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free_and_xStrdup(&proc->comm, command);
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} else if (settings->showThreadNames) {
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if (! LinuxProcessList_readCmdlineFile(proc, procFd)) {
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goto errorReadingProcess;
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@ -351,7 +351,6 @@ int SolarisProcessList_walkproc(psinfo_t* _psinfo, lwpsinfo_t* _lwpsinfo, void*
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sproc->zname = SolarisProcessList_readZoneName(spl->kd, sproc);
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proc->user = UsersTable_getRef(pl->usersTable, proc->st_uid);
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proc->comm = xStrdup(_psinfo->pr_fname);
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proc->commLen = strnlen(_psinfo->pr_fname, PRFNSZ);
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}
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// End common code pass 1
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