/* Test for fdopen bugs. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #undef assert #define assert(x) \ if (!(x)) \ { \ fputs ("test failed: " #x "\n", stderr); \ retval = 1; \ goto the_end; \ } char buffer[256]; int main (int argc, char *argv[]) { char name[] = "/tmp/tst-fdopen.XXXXXX"; FILE *fp = NULL; int retval = 0; int fd; fd = mkstemp (name); if (fd == -1) { printf ("mkstemp failed: %m\n"); return 1; } close (fd); fp = fopen (name, "w"); assert (fp != NULL) fputs ("foobar and baz", fp); fclose (fp); fp = NULL; fd = open (name, O_RDONLY); assert (fd != -1); assert (lseek (fd, 5, SEEK_SET) == 5); /* The file position indicator associated with the new stream is set to the position indicated by the file offset associated with the file descriptor. */ fp = fdopen (fd, "r"); assert (fp != NULL); assert (getc (fp) == 'r'); assert (getc (fp) == ' '); the_end: if (fp != NULL) fclose (fp); unlink (name); return retval; }