grnmarker笔记

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/usr/sbin/dadriveinfo 1 2>/dev/null| /bin/grep -F "Serial Number" | awk '{print $3}'

Drive: Drive1 (/dev/xdb)
Type: SATA
Model: Hitachi HDS5C3020ALA632
Serial Number: ML0220F31ABGJN
Firmware Revision: ML6OA580
Size [KB] (1 KB = 1024 Bytes): 1953514584 KB
Size [GB] (1 GB = 1024^3 Bytes): 1863 GB
Size [GB] (1 GB = 10^9 Bytes): 2000 GB
Read Total [MB] (1 MB = 1024^2 Bytes): 3496 MB
Write Total [MB] (1 MB = 1024^2 Bytes): 1392 MB
Read block requests: 26079
Write block requests: 18727
Last access: 0 s ago
Failure reason: Not_Available
Disk cache: disabled

int main(void){    char cmd[64] = {0};    FILE *fp = NULL;    char file[64] = {0};    char string[512] = {0};    int result = 0;    int i = 0;    char *p = NULL;    sprintf(file, "mytmp");    //sprintf(cmd, "cat /proc/cpuinfo > mytmp");    //result = system(cmd);    //printf("%s", cmd);    fp = fopen(file, "r");    if(fp == NULL){        printf("%s is not exist", file);         return 0;    }       while(fgets(cmd, sizeof(cmd), fp) != NULL)    {           for(i = 0; i < GRN_KEYS_CNT; i++)        {               if(strncmp(cmd, grn_keys[i], strlen(grn_keys[i]))){             continue;            }               printf("%d\t**i=%d\tcmd=%s\t**grn_keys[%d] = %s\t\n", __LINE__, i, cmd, i, grn_keys[i]);                if((p = strchr(cmd, '\n')))                *p = 0;            printf("%d\tp = %s\tcmd=%s\n", __LINE__, p, cmd);            p = cmd + strlen(grn_keys[i]);            while(*p == ' ' || *p == '\t'){                p++;              printf("%d\tp = %s\tcmd=%s\n", __LINE__, p, cmd);            }               printf("%d\tp = %s\n", __LINE__, p);         }           //printf("%d\tp = %s\tq=%s\n", __LINE__, p, q);        }           return 0;  }

int static do_system_ret_buf(char *command, char *ret_buf, int buf_size){    char    *tmps;    int     pipefd[2];    pid_t   pid, childpid;    int     status, orig_stdin, rc;    if ((ret_buf == NULL) || (buf_size == 0))   /* caller should call system directly */        return system(command);    orig_stdin = dup(0);    if (orig_stdin < 0) {        return 1;    }    /* Flush all open output streams (stdout, in particular).  Without the flush,     * garbage can end up in ret_buf.     */    if (fflush(NULL) != 0) {        close(orig_stdin);        return 1;    }    if(pipe(pipefd)) {        close(orig_stdin);        return 1;    }    switch(pid=fork()){    case -1:        close(orig_stdin);        return 1;    case 0 : /* child's path */        /* pipefd[1] is for writing to the pipe. We want the output         * that used to go to the standard output (file descriptor 1)         * to be written to the pipe. The following command does this,         * creating a new file descripter 1 (the lowest available)         * that writes where pipefd[1] goes.         */        if (dup2(pipefd[1], 1) < 0)    /* points pipefd[1] at stdout */            exit(1);        close (pipefd[0]);          /* child isn't going to read from the pipe */        rc = system(command);        if (rc == 0)            exit(0);  // system call success        exit(1);    default: /* parent's path */        if (dup2(pipefd[0], 0) < 0) {  /* Set fd 0 (stdin) to read from the pipe */            dup2(orig_stdin, 0);            close(orig_stdin);            return 1;        }        close (pipefd[1]);          /* no need to write to the pipe */        close(pipefd[0]);           /* close the read pipe also */        tmps = ret_buf;        do {            *tmps = fgetc(stdin);        } while ((*tmps++ != EOF) && (--buf_size > 0));        tmps--;        *tmps = 0;        dup2(orig_stdin, 0);            /* restore original stdin */        close(orig_stdin);              /* close backup stdin */        childpid = waitpid(0, &status, 0);        if (WEXITSTATUS(status))        ;        else            return 0;  /* child exited normally and system call ok */        return 1;    }}

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