1 #include <string.h> 2 #include <stdlib.h> 3 #include <unistd.h> 4 #include <sys/types.h> 5 #include <sys/stat.h> 6 #include <fcntl.h> 7 #include <sys/time.h> 8 9 // For some reason, the stack frame below __GI_write is disappearing. 10 // Therefore, if I don't want the write errors to be merged, I have to 11 // ensure they have a different stack trace. I do this by using this 12 // function. Weird. 13 __attribute__((noinline)) 14 void mywrite(char* buf, int len) 15 { 16 write(-1, buf, len); 17 } 18 19 __attribute__((noinline)) 20 void mygetitimer(long arg1, struct itimerval* itval) 21 { 22 getitimer(arg1, itval); 23 } 24 25 __attribute__((noinline)) 26 void myopen(char* name, long flags) 27 { 28 open(name, flags); 29 } 30 31 int main(void) 32 { 33 char *buf = malloc(sizeof(char)*6), *buf2 = malloc(sizeof(char)*6); 34 struct itimerval* itval = malloc(sizeof(struct itimerval) - 1); 35 int diff = buf2 - buf; 36 buf[0] = 'h'; 37 buf[1] = 'e'; 38 buf[2] = 'l'; 39 buf[3] = 'l'; 40 buf[4] = 'o'; 41 buf[5] = 'x'; 42 43 // error (read) (will fail due to -1, as we want -- don't want any 44 // unpredictable output to foul up the test) 45 mywrite(buf+3, 5); // error (read) 46 mywrite(buf-1, 5); // error (read) 47 mywrite(buf+1, diff); // error (read) 48 myopen(buf+3, 0x0); // error (read_asciiz) 49 50 mygetitimer(0, itval); // error (write) 51 52 //---- 53 free(buf); 54 mywrite(buf, 5); // error 55 mywrite(buf+3, 5); // error 56 mywrite(buf+1, diff); // error (read) 57 58 return 0; 59 } 60
