mirror of https://github.com/xzeldon/htop.git
Merge pull request #398 from natoscott/harden-linux-btime-init
Harden the extraction of boot time for the Linux platform
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commit
4507911cc3
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@ -226,26 +226,25 @@ ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* pidMatchList, ui
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// Test /proc/PID/smaps_rollup availability (faster to parse, Linux 4.14+)
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this->haveSmapsRollup = (access(PROCDIR "/self/smaps_rollup", R_OK) == 0);
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// Read btime
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// Read btime (the kernel boot time, as number of seconds since the epoch)
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{
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FILE* statfile = fopen(PROCSTATFILE, "r");
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if (statfile == NULL) {
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if (statfile == NULL)
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CRT_fatalError("Cannot open " PROCSTATFILE);
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}
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while (true) {
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char buffer[PROC_LINE_LENGTH + 1];
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if (fgets(buffer, sizeof(buffer), statfile) == NULL) {
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CRT_fatalError("No btime in " PROCSTATFILE);
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} else if (String_startsWith(buffer, "btime ")) {
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if (sscanf(buffer, "btime %lld\n", &btime) != 1) {
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CRT_fatalError("Failed to parse btime from " PROCSTATFILE);
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}
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if (fgets(buffer, sizeof(buffer), statfile) == NULL)
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break;
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}
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if (String_startsWith(buffer, "btime ") == false)
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continue;
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if (sscanf(buffer, "btime %lld\n", &btime) == 1)
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break;
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CRT_fatalError("Failed to parse btime from " PROCSTATFILE);
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}
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fclose(statfile);
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if (!btime)
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CRT_fatalError("No btime in " PROCSTATFILE);
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}
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// Initialize CPU count
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