應力NG：編寫使用execv調用壓力-ng的命令，並返回，如果它是成功還是失敗的應用程序

Question

應力NG：如何使用execv調用應力-NG命令編寫C或CPP的應用程序在MIPS中進行CPU和內存測試，並在成功或失敗時返回其狀態？ 給定一個可執行的壓力ng文件，該文件已使用其工具鏈交叉編譯爲MIPS32版本。

樣品壓力-NG命令：

stress-ng --vm 8 --vm-bytes 80% -t 1h 
stress-ng --cpu 8 --cpu-ops 800000 

Answer 1

也許這就夠了：

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <unistd.h> 
#include <errno.h> 
#include <sys/types.h> 
#include <sys/wait.h> 

int main(void) 
{ 
     pid_t pid; 
     int ret; 

     char *stress_ng = "/usr/bin/stress-ng"; 

     char *argv_new[] = { stress_ng, 
       "--vm", "8", "--vm-bytes", "80%", 
       "-t", "2s", "-v", NULL }; 
     char *env_new[] = { NULL }; 

     pid = fork(); 
     if (pid < 0) { 
       fprintf(stderr, "fork failed: %d (%s)\n", 
         errno, strerror(errno)); 
       exit(EXIT_FAILURE); 
     } else if (pid == 0) { 
       ret = execve(stress_ng, argv_new, env_new); 
       if (ret < 0) { 
         fprintf(stderr, "execve failed: %d (%s)\n", 
           errno, strerror(errno)); 
         exit(EXIT_FAILURE); 
       } 
       _exit(ret); 
     } else { 
       /* Parent */ 
       int status; 

       ret = waitpid(pid, &status, 0); 
       if (ret < 0) { 
         fprintf(stderr, "waitpid failed: %d (%s)\n", 
           errno, strerror(errno)); 
         exit(EXIT_FAILURE); 
       } 
       ret = WEXITSTATUS(status); 
       printf("stress-ng returned: %d\n", ret); 
     } 
     exit(0); 
} 

Answer 2

如果要分析從壓力NG輸出，則需要家長之間建立一個管與孩子和家長需要讀取和解析輸出在管道上，類似如下：

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <unistd.h> 
#include <errno.h> 
#include <sys/types.h> 
#include <sys/wait.h> 

int main(void) 
{ 
    pid_t pid; 
    int ret; 
    int fds[2]; 

    char *stress_ng = "/usr/bin/stress-ng"; 

    char *argv_new[] = { stress_ng, 
     "--vm", "8", "--vm-bytes", "80%", 
     "-t", "2s", "-v", NULL }; 
    char *env_new[] = { NULL }; 

    if (pipe(fds) < 0) { 
     fprintf(stderr, "pipe failed: %d (%s)\n", 
      errno, strerror(errno)); 
     exit(EXIT_FAILURE); 
    } 

    pid = fork(); 
    if (pid < 0) { 
     fprintf(stderr, "fork failed: %d (%s)\n", 
      errno, strerror(errno)); 
     exit(EXIT_FAILURE); 
    } else if (pid == 0) { 
     //close(STDERR_FILENO); 
     close(STDIN_FILENO); 
     close(fds[0]); 
     dup2(fds[1], STDOUT_FILENO); 
     dup2(fds[1], STDERR_FILENO); 
     ret = execve(stress_ng, argv_new, env_new); 
     if (ret < 0) { 
      fprintf(stderr, "execve failed: %d (%s)\n", 
       errno, strerror(errno)); 
      exit(EXIT_FAILURE); 
     } 
     close(fds[1]); 
     _exit(ret); 
    } else { 
     /* Parent */ 
     int status; 
     FILE *fp; 
     char buffer[1024]; 

     close(fds[1]); 
     fp = fdopen(fds[0], "r"); 
     if (!fp) { 
      fprintf(stderr, "fdopen failed: %d (%s)\n", 
       errno, strerror(errno)); 
      exit(EXIT_FAILURE); 
     } 

     while (fgets(buffer, sizeof(buffer), fp)) { 
      size_t len = strlen(buffer); 
      if (len > 0) 
       buffer[len - 1] = '\0'; 

      if (strstr(buffer, "completed")) 
       printf("GOT: <%s>\n", buffer); 
     } 
     fclose(fp); 
     close(fds[0]); 

     ret = waitpid(pid, &status, 0); 
     if (ret < 0) { 
      fprintf(stderr, "waitpid failed: %d (%s)\n", 
       errno, strerror(errno)); 
      exit(EXIT_FAILURE); 
     } 
     ret = WEXITSTATUS(status); 
     printf("stress-ng returned: %d\n", ret); 
    } 
    exit(0); 
}