I observed a memory leak (about 20 bytes per iteration) when I ran this simple program on my Scientific Linux 5.4 box (kernel version 2.6.18- 128.1.1.e15). What I did was noting the output of "free -m" before and after I ran the program (which loops for 300000). I observed a 6MB increase in memory use d. No error was printed during the run. If I comment out the 2 fseek statements, then I don't see any memory increase. The file size is about 700KB. I was wondering if someone can tell me if this is a known issue or if I'm doing something wrong. Thanks, Khoa. ======Source file, compiled with gcc========= #include <stdio.h> #include <errno.h> int main() { FILE * ptr = NULL; int count = 0; ptr = fopen("myBinaryFile","r"); while (ptr != NULL && count++ < 300000) { usleep(1000); if (fseek(ptr, 0, SEEK_END)) printf("Error 1: %d\n", errno); if (fseek(ptr, 0, SEEK_SET)) printf("Error 2: %d\n", errno); if (fclose(ptr)) break; usleep(10000); ptr = fopen("myBinaryFile","r"); } fclose(ptr); if (count >= 300000) print("Success\n"); return 0; }