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linux: make uv_cpu_info() handle absent procfs

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Return an error when reading from /proc files fails because the procfs
isn't mounted.

This is a back-port of commit 7e59f9b from the master branch.
This commit is contained in:
Ben Noordhuis 2013-03-02 01:44:31 +01:00
parent 23b93474b1
commit b0c5e62035
1 changed files with 22 additions and 9 deletions
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31
src/unix/linux/linux-core.c
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@ -64,9 +64,9 @@ static struct {
size_t len;
} process_title;
static void read_models(unsigned int numcpus, uv_cpu_info_t* ci);
static int read_models(unsigned int numcpus, uv_cpu_info_t* ci);
static int read_times(unsigned int numcpus, uv_cpu_info_t* ci);
static void read_speeds(unsigned int numcpus, uv_cpu_info_t* ci);
static void read_times(unsigned int numcpus, uv_cpu_info_t* ci);
static unsigned long read_cpufreq(unsigned int cpunum);
@ -325,10 +325,19 @@ uv_err_t uv_cpu_info(uv_cpu_info_t** cpu_infos, int* count) {
if (ci == NULL)
return uv__new_sys_error(ENOMEM);
read_models(numcpus, ci);
read_times(numcpus, ci);
if (read_models(numcpus, ci)) {
SAVE_ERRNO(free(ci));
return uv__new_sys_error(errno);
}
/* read_models() on x86 also reads the CPU speed from /proc/cpuinfo */
if (read_times(numcpus, ci)) {
SAVE_ERRNO(free(ci));
return uv__new_sys_error(errno);
}
/* read_models() on x86 also reads the CPU speed from /proc/cpuinfo.
* We don't check for errors here. Worst case, the field is left zero.
*/
if (ci[0].speed == 0)
read_speeds(numcpus, ci);
@ -350,7 +359,7 @@ static void read_speeds(unsigned int numcpus, uv_cpu_info_t* ci) {
/* Also reads the CPU frequency on x86. The other architectures only have
* a BogoMIPS field, which may not be very accurate.
*/
static void read_models(unsigned int numcpus, uv_cpu_info_t* ci) {
static int read_models(unsigned int numcpus, uv_cpu_info_t* ci) {
#if defined(__i386__) || defined(__x86_64__)
static const char model_marker[] = "model name\t: ";
static const char speed_marker[] = "cpu MHz\t\t: ";
@ -373,7 +382,7 @@ static void read_models(unsigned int numcpus, uv_cpu_info_t* ci) {
fp = fopen("/proc/cpuinfo", "r");
if (fp == NULL)
return;
return -1;
model_idx = 0;
speed_idx = 0;
@ -398,10 +407,12 @@ static void read_models(unsigned int numcpus, uv_cpu_info_t* ci) {
}
}
fclose(fp);
return 0;
}
static void read_times(unsigned int numcpus, uv_cpu_info_t* ci) {
static int read_times(unsigned int numcpus, uv_cpu_info_t* ci) {
unsigned long clock_ticks;
struct uv_cpu_times_s ts;
unsigned long user;
@ -421,7 +432,7 @@ static void read_times(unsigned int numcpus, uv_cpu_info_t* ci) {
fp = fopen("/proc/stat", "r");
if (fp == NULL)
return;
return -1;
if (!fgets(buf, sizeof(buf), fp))
abort();
@ -466,6 +477,8 @@ static void read_times(unsigned int numcpus, uv_cpu_info_t* ci) {
ci[num++].cpu_times = ts;
}
fclose(fp);
return 0;
}