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libbb: factor out common code from mpstat/iostat

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-08-16 02:49:21 +02:00
parent a4160e15ec
commit c9b9750a0e
5 changed files with 56 additions and 66 deletions
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2
include/libbb.h
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@ -1479,6 +1479,8 @@ procps_status_t* procps_scan(procps_status_t* sp, int flags) FAST_FUNC;
void read_cmdline(char *buf, int size, unsigned pid, const char *comm) FAST_FUNC;
pid_t *find_pid_by_name(const char* procName) FAST_FUNC;
pid_t *pidlist_reverse(pid_t *pidList) FAST_FUNC;
int starts_with_cpu(const char *str) FAST_FUNC;
unsigned get_cpu_count(void) FAST_FUNC;
extern const char bb_uuenc_tbl_base64[];

3
libbb/Kbuild.src
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@ -157,6 +157,9 @@ lib-$(CONFIG_MOUNT) += find_mount_point.o
lib-$(CONFIG_HWCLOCK) += rtc.o
lib-$(CONFIG_RTCWAKE) += rtc.o
lib-$(CONFIG_IOSTAT) += get_cpu_count.o
lib-$(CONFIG_MPSTAT) += get_cpu_count.o
# We shouldn't build xregcomp.c if we don't need it - this ensures we don't
# require regex.h to be in the include dir even if we don't need it thereby
# allowing us to build busybox even if uclibc regex support is disabled.

47
libbb/get_cpu_count.c Normal file
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@ -0,0 +1,47 @@
/* vi: set sw=4 ts=4: */
/*
* Factored out of mpstat/iostat.
*
* Copyright (C) 2010 Marek Polacek <mmpolacek@gmail.com>
*
* Licensed under GPLv2, see file License in this tarball for details.
*/
#include "libbb.h"
/* Does str start with "cpu"? */
int FAST_FUNC starts_with_cpu(const char *str)
{
return ((str[0] - 'c') | (str[1] - 'p') | (str[2] - 'u')) == 0;
}
/*
* Get number of processors. Uses /proc/stat.
* Return value 0 means one CPU and non SMP kernel.
* Otherwise N means N processor(s) and SMP kernel.
*/
unsigned FAST_FUNC get_cpu_count(void)
{
FILE *fp;
char line[256];
int proc_nr = -1;
fp = xfopen_for_read("/proc/stat");
while (fgets(line, sizeof(line), fp)) {
if (!starts_with_cpu(line)) {
if (proc_nr >= 0)
break; /* we are past "cpuN..." lines */
continue;
}
if (line[3] != ' ') { /* "cpuN" */
int num_proc;
if (sscanf(line + 3, "%u", &num_proc) == 1
&& num_proc > proc_nr
) {
proc_nr = num_proc;
}
}
}
fclose(fp);
return proc_nr + 1;
}

30
procps/iostat.c
View File

@ -114,26 +114,6 @@ static void print_header(void)
buf, uts.machine, G.total_cpus);
}
static int get_number_of_cpus(void)
{
#ifdef _SC_NPROCESSORS_CONF
return sysconf(_SC_NPROCESSORS_CONF);
#else
char buf[128];
int n = 0;
FILE *fp;
fp = xfopen_for_read("/proc/cpuinfo");
while (fgets(buf, sizeof(buf), fp))
if (strncmp(buf, "processor\t:", 11) == 0)
n++;
fclose(fp);
return n;
#endif
}
static void get_localtime(struct tm *ptm)
{
time_t timer;
@ -148,12 +128,6 @@ static void print_timestamp(void)
printf("%s\n", buf);
}
/* Does str start with "cpu"? */
static int starts_with_cpu(const char *str)
{
return ((str[0] - 'c') | (str[1] - 'p') | (str[2] - 'u')) == 0;
}
/* Fetch CPU statistics from /proc/stat */
static void get_cpu_statistics(struct stats_cpu *sc)
{
@ -509,7 +483,9 @@ int iostat_main(int argc, char **argv)
G.clk_tck = get_user_hz();
/* Determine number of CPUs */
G.total_cpus = get_number_of_cpus();
G.total_cpus = get_cpu_count();
if (G.total_cpus == 0)
G.total_cpus = 1;
/* Parse and process arguments */
/* -k and -m are mutually exclusive */

40
procps/mpstat.c
View File

@ -119,12 +119,6 @@ enum {
};
/* Does str start with "cpu"? */
static int starts_with_cpu(const char *str)
{
return !((str[0] - 'c') | (str[1] - 'p') | (str[2] - 'u'));
}
/* Is option on? */
static ALWAYS_INLINE int display_opt(int opt)
{
@ -815,38 +809,6 @@ static void print_header(struct tm *t)
uts.sysname, uts.release, uts.nodename, cur_date, uts.machine, G.cpu_nr);
}
/*
* Get number of processors in /proc/stat
* Return value '0' means one CPU and non SMP kernel.
* Otherwise N means N processor(s) and SMP kernel.
*/
static int get_cpu_nr(void)
{
FILE *fp;
char line[256];
int proc_nr = -1;
fp = xfopen_for_read(PROCFS_STAT);
while (fgets(line, sizeof(line), fp)) {
if (!starts_with_cpu(line)) {
if (proc_nr >= 0)
break; /* we are past "cpuN..." lines */
continue;
}
if (line[3] != ' ') { /* "cpuN" */
int num_proc;
if (sscanf(line + 3, "%u", &num_proc) == 1
&& num_proc > proc_nr
) {
proc_nr = num_proc;
}
}
}
fclose(fp);
return proc_nr + 1;
}
/*
* Get number of interrupts available per processor
*/
@ -910,7 +872,7 @@ int mpstat_main(int UNUSED_PARAM argc, char **argv)
G.interval = -1;
/* Get number of processors */
G.cpu_nr = get_cpu_nr();
G.cpu_nr = get_cpu_count();
/* Get number of clock ticks per sec */
G.hz = get_hz();