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| #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
static void OnSignal(int signalno)
{
printf("receive signal num: %d\n", signalno);
int bExit = true;
for (int i = 0; i < 100; i++)
{
if (signalno == 17 || signalno == 13)
{
bExit = false;
break;
}
}
if (bExit)
{
printf("exit process.\n");
}
}
// 通过管道读取执行命令后的信息
void GetSystemCmdInfo(const char* cmd, char* buf, int len)
{
char info[256] = {0};
FILE* fp = popen(cmd, "r");
if (fp)
{
fread(info, 1, sizeof(info), fp);
if ( buf != NULL && len > (int)strlen(info) )
{
strcpy(buf, info);
}
pclose(fp);
}
}
// 通过文件读取到信息
// 这种方法是读文件，上面的方法是执行命令，两者不是一回事
void ReadKernelVersion(char* file, char* buf, int len)
{
FILE* fp = NULL;
char info[256] = {0};
fp = fopen(file, "r");
if (fp == NULL)
{
perror("open file error");
return;
}
fread(info, 1, sizeof(info), fp);
if ( buf != NULL && len > (int)strlen(info) )
{
strcpy(buf, info);
}
fclose(fp);
}
int main(void)
{
char szValue[512] = {0};
char buf[1024] = {0};
int iLen = 0;
for (int i = 0; i < 255; i++)
{
if (i != SIGILL && i != SIGBUS && i != SIGSEGV)
{
signal(i, OnSignal);
}
}
// 执行此函数时，会有SIGCHLD信号
GetSystemCmdInfo("cat /proc/version", szValue, sizeof(szValue));
//ReadKernelVersion("/proc/version", szValue, sizeof(szValue));
iLen = sprintf(buf, "[Kernel ver]: %s\r\n", szValue);
printf("%s", buf);
return 0;
}
|
