c语言:fprintf pid_t

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#include <stdio.h> #include <signal.h> #include <unistd.h> #include <getopt.h> static pid_t PidOutPut (char *path) {   FILE *fp;   pid_t pid;     pid = getpid();     fp = fopen (path, "w");   if (fp != NULL)     {       fprintf (fp, "%d\n", (int) pid);       fclose (fp);       return -1;     }   return pid; } int main() {   pid_t op;   op =  PidOutPut("/home/lyd/mywork/pid/abc");   printf("%d",(int)op); }