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tools: acrntrace: Remove use of binary "ls"

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The tools currently rely on the availability of binary "ls" to be available in
the $PATH on the Service OS. This create an obscure dependency. The patch changes
the code to use standard C APIs to perform the same functionality which makes
the code more self-contained.

Signed-off-by: Kaige Fu <kaige.fu@intel.com>
Reviewed-by: Yan, Like <like.yan@intel.com>
This commit is contained in:
Kaige Fu 2018-07-05 10:40:50 +08:00 committed by lijinxia
parent a2a412244c
commit e699462161
1 changed files with 18 additions and 39 deletions
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57
tools/acrntrace/acrntrace.c
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@ -11,6 +11,7 @@
#include <sys/mman.h>
#include <sys/statvfs.h>
#include <time.h>
#include <dirent.h>
#include <signal.h>
#include <errno.h>
#include <pthread.h>
@ -30,7 +31,7 @@ static int exiting = 0;
/* for opt */
static uint64_t period = 10000;
static const char optString[] = "i:hcr:t:";
static const char dev_name[] = "/dev/acrn_trace";
static const char dev_prefix[] = "acrn_trace_";
static uint32_t flags;
static char trace_file_dir[TRACE_FILE_DIR_LEN];
@ -139,50 +140,28 @@ static int parse_opt(int argc, char *argv[])
return 0;
}
static int shell_cmd(const char *cmd, char *outbuf, int len)
{
FILE *ptr;
char cmd_buf[256];
int ret;
if (!outbuf)
return system(cmd);
memset(cmd_buf, 0, sizeof(cmd_buf));
memset(outbuf, 0, len);
snprintf(cmd_buf, sizeof(cmd_buf), "%s 2>&1", cmd);
ptr = popen(cmd_buf, "re");
if (!ptr)
return -1;
ret = fread(outbuf, 1, len, ptr);
pclose(ptr);
return ret;
}
static int get_cpu_num(void)
{
struct dirent *pdir;
int cpu_num = 0;
char *ret;
DIR *dir;
char cmd[128];
char buf[16];
int ret;
snprintf(cmd, sizeof(cmd), "ls %s_* | wc -l", dev_name);
ret = shell_cmd(cmd, buf, sizeof(buf));
if (ret <= 0) {
pr_err("Faile to get cpu number, use default 4\n");
return PCPU_NUM;
dir = opendir("/dev");
if (!dir) {
printf("Error opening /dev: %s\n", strerror(errno));
return -1;
}
ret = atoi(buf);
if (ret <= 0) {
pr_err("Wrong cpu number, use default 4\n");
return PCPU_NUM;
while (pdir = readdir(dir)) {
ret = strstr(pdir->d_name, dev_prefix);
if (ret)
cpu_num++;
}
return ret;
closedir(dir);
return cpu_num;
}
static int create_trace_file_dir(char *dir)
@ -270,7 +249,7 @@ static int create_reader(reader_struct * reader, uint32_t cpu)
{
char trace_file_name[TRACE_FILE_NAME_LEN];
snprintf(reader->dev_name, DEV_PATH_LEN, "%s_%u", dev_name, cpu);
snprintf(reader->dev_name, DEV_PATH_LEN, "/dev/%s%u", dev_prefix, cpu);
reader->param.cpuid = cpu;
reader->dev_fd = open(reader->dev_name, O_RDWR);