From 07b05ddf5c0ec9242ac8abea3dd7bb55fa25ffd4 Mon Sep 17 00:00:00 2001 From: Florian Forster Date: Fri, 2 Oct 2009 09:06:41 +0200 Subject: [PATCH] processes plugin: Improve the error handling. The fork-rate function now returns ULONG_MAX upon error. The error detection when using strtoul has been improved (overflow is not the only possible error). --- src/processes.c | 30 +++++++++++++++++++----------- 1 file changed, 19 insertions(+), 11 deletions(-) diff --git a/src/processes.c b/src/processes.c index 3623f73f..c96e9110 100644 --- a/src/processes.c +++ b/src/processes.c @@ -846,29 +846,36 @@ static unsigned long read_fork_rate () char buf[1024]; unsigned long result = 0; int numfields; - char *fields[2]; + char *fields[3]; proc_stat = fopen("/proc/stat", "r"); if (proc_stat == NULL) { char errbuf[1024]; ERROR ("processes plugin: fopen (/proc/stat) failed: %s", sstrerror (errno, errbuf, sizeof (errbuf))); - return 0; + return ULONG_MAX; } while (fgets (buf, sizeof(buf), proc_stat) != NULL) { - if (strncmp (buf, "processes", 9)) - continue; - numfields = strsplit(buf, fields, 2); + char *endptr; + + numfields = strsplit(buf, fields, STATIC_ARRAY_SIZE (fields)); if (numfields != 2) { - ERROR ("processes plugin: processes in /proc/stat contain more than 2 fields."); + ERROR ("processes plugin: processes in /proc/stat " + "contains more than 2 fields."); break; } + if (strcmp ("processes", fields[0]) != 0) + continue; - result = strtoul(fields[1], NULL, 10); - if (errno == ERANGE && result == ULONG_MAX) { - ERROR ("processes plugin: processes value in /proc/stat overflows."); + errno = 0; + endptr = NULL; + result = strtoul(fields[1], &endptr, 10); + if ((endptr == fields[1]) || (errno != 0)) { + ERROR ("processes plugin: Cannot parse fork rate: %s", + fields[1]); + result = ULONG_MAX; break; } @@ -885,7 +892,7 @@ static void ps_submit_fork_rate (unsigned long value) value_t values[1]; value_list_t vl = VALUE_LIST_INIT; - values[0].derive = value; + values[0].derive = (derive_t) value; vl.values = values; vl.values_len = 1; @@ -1297,7 +1304,8 @@ static int ps_read (void) ps_submit_proc_list (ps_ptr); fork_rate = read_fork_rate(); - ps_submit_fork_rate(fork_rate); + if (fork_rate != ULONG_MAX) + ps_submit_fork_rate(fork_rate); /* #endif KERNEL_LINUX */ #elif HAVE_LIBKVM_GETPROCS && HAVE_STRUCT_KINFO_PROC_FREEBSD -- 2.11.0