Linux C Database backup second Edition

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1#include <sys/types.h>2#include <sys/wait.h>3#include <ctype.h>4#include <unistd.h>5#include <string.h>6#include <stdlib.h>7#include <stdio.h>8 9 //data table file to be backed up (one row for a database)Ten #defineDb_file "./db_list" One //maximum number of databases that can be backed up A #defineNUM 20 - //The maximum number of characters for a database name - #defineLEN 128 the //to save a database read from Db_file - Char*Db_list[num]; - //the number of databases read from the Db_file file - intRead_num; + //Request Memory Function - voidmalloc_dblist (); + //Releasing memory Functions A voidfree_dblist (); at //Reading database files - voidreaddbfile (); -  - intMainintargcChar*argv[]) { - pid_t pid; -     inti; in     CharBuf[len]; -  to     //reading database information from a file + readdbfile (); -      thePID =fork (); *  $     if(PID <0) {Panax Notoginsengfprintf (stderr,"Fork error\n"); -Exit1); the     } +      A     Switch(PID) { the          Case-1: +fprintf (stderr,"Fork failed\n"); -Exit1); $          Case 0: $             //A child process makes a backup of the database -              for(i =0; i < Read_num; i++) { -memset (BUF,' /', LEN); thesprintf (BUF,"%s%s%s%s%s","Mysqldump-uroot", Db_list[i],">", Db_list[i],". SQL"); - system (BUF);Wuyiprintf"%d,%s\n", I, buf); the             } -              Break; Wu     } -     //wait for the end of the child process About     if(PID >0) { $         intStat_val; - pid_t child_pid; -          -Child_pid = Wait (&stat_val); A          +         if(!wifexited (Stat_val)) { thefprintf (stdout,"Child terminated abnormaly\n"); -         } $Exit1); the          the     } the      the free_dblist (); -      inExit0); the      the } About  the voidmalloc_dblist () the { the     inti =0; +     //malloc for Db_list -      for(i =0; i < NUM; i++) { theDb_list[i] =malloc(LEN);Bayimemset (Db_list[i],' /', LEN); the     } the } - voidfree_dblist () - { the     inti; the     //Free db_list ' s memory the      for(i =0; i < NUM; i++) { the          Free(Db_list[i]); -     } the } the  the voidReaddbfile ()94 { theFILE *FP; the      thefp = fopen (Db_file,"R");98     if(!FP) { Aboutfprintf (stderr,"%s not found\n", db_file); -     }101     Else {102 malloc_dblist ();103         104Read_num =0; the          while(FP, fscanf"%127[^\r\n]\n", db_list[read_num]) = =1) {106 puts (Db_list[read_num]);107read_num++;108         }109          the fclose (FP); 111     } the     113}

Linux C Database backup second Edition