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int open(const char *, int mode);
void close(int fd);
int dup (int old_fd);
int dup2 (int old_fd, int new_fd);
int dup3 (int old_fd, int new_fd, int flags);
int write (int fd, void *buf, int nbytes);
int read (int fd, void *buf, int nbytes);
#define O_RDONLY 0
#define O_WRONLY 1
#define O_RDWR 2
#define O_ACCMODE 3
void test_1 (const char *path)
{
int old_fd = open (path, O_RDWR);
int new_fd = dup (old_fd); /* { dg-warning "'dup' on possibly invalid file descriptor 'old_fd'" } */
close(old_fd);
close(new_fd);
}
void test_2 (const char *path)
{
int old_fd = open (path, O_RDWR);
if (old_fd != -1)
{
int new_fd = dup (old_fd);
close(old_fd);
return; /* { dg-warning "leak of file descriptor 'new_fd' \\\[CWE-775\\\]" } */
}
}
void test_3 (const char *path, void *buf)
{
int old_fd = open (path, O_RDWR);
if (old_fd != -1)
{
int new_fd = dup (old_fd);
write (new_fd, buf, 1); /* { dg-warning "'write' on possibly invalid file descriptor 'new_fd'" } */
close (new_fd);
close(old_fd);
}
}
void test_5 (const char *path, void *buf)
{
int old_fd = open (path, O_RDWR);
if (old_fd != -1)
{
int new_fd = dup (old_fd);
if (new_fd != -1)
{
write (new_fd, buf, 1);
close (new_fd);
}
close(old_fd);
}
}
void test_7 (const char *path)
{
int old_fd = open (path, O_RDWR);
dup2 (old_fd, 4); /* { dg-warning "'dup2' on possibly invalid file descriptor 'old_fd'" } */
close(old_fd);
}
void test_8 (const char *path)
{
int old_fd = open (path, O_RDWR);
int new_fd = open (path, O_RDWR);
if (old_fd != -1)
{
dup2 (old_fd, new_fd); /* { dg-warning "'dup2' on possibly invalid file descriptor 'new_fd'" } */
close (old_fd);
}
close (new_fd);
}
void test_9 (const char *path, void *buf)
{
int old_fd = open (path, O_RDWR);
if (old_fd != -1)
{
int new_fd = open (path, O_RDWR);
if (new_fd != -1)
{
int lhs = dup2 (old_fd, new_fd);
write (lhs, buf, 1); /* { dg-warning "'write' on possibly invalid file descriptor 'lhs'" } */
close(new_fd);
close(lhs);
}
close(old_fd);
}
}
void test_10 (const char *path, int flags)
{
int old_fd = open (path, O_RDWR);
int new_fd = open (path, O_RDWR);
if (old_fd != -1)
{
dup3 (old_fd, new_fd, flags); /* { dg-warning "'dup3' on possibly invalid file descriptor 'new_fd'" } */
close(old_fd);
}
close(new_fd);
}
void test_11 (const char *path, int flags)
{
int old_fd = open (path, O_RDWR);
int new_fd = open (path, O_RDWR);
if (new_fd != -1)
{
dup3 (old_fd, new_fd, flags); /* { dg-warning "'dup3' on possibly invalid file descriptor 'old_fd'" } */
close(new_fd);
}
close(old_fd);
}
void test_12 (const char *path, void *buf)
{
int old_fd = open (path, O_RDONLY);
if (old_fd != -1)
{
int new_fd = dup (old_fd);
if (new_fd != -1)
{
write (new_fd, buf, 1); /* { dg-warning "'write' on read-only file descriptor 'new_fd'" } */
close(new_fd);
}
close(old_fd);
}
}
void test_13 (const char *path, void *buf)
{
int old_fd = open (path, O_WRONLY);
if (old_fd != -1)
{
int new_fd = dup (old_fd);
if (new_fd != -1)
{
read (new_fd, buf, 1); /* { dg-warning "'read' on write-only file descriptor 'new_fd'" } */
close(new_fd);
}
close(old_fd);
}
}
void test_14 (const char *path, void *buf)
{
int old_fd = open (path, O_RDWR);
if (old_fd != -1)
{
int new_fd = dup (old_fd);
if (new_fd != -1)
{
write (new_fd, buf, 1);
read (new_fd, buf, 1);
close(new_fd);
}
close(old_fd);
}
}
void test_15 (void *buf)
{
int fd = dup(0);
read (fd, buf, 1); /* { dg-warning "'read' on possibly invalid file descriptor 'fd'" } */
close(fd);
}
void test_16 (void *buf)
{
int fd = dup(1);
if (fd != -1)
{
write (fd, buf, 1);
close (fd);
}
}
void test_17 (const char *path)
{
int fd = open (path, O_RDWR);
close(fd);
dup (fd); /* { dg-warning "'dup' on closed file descriptor 'fd'" } */
dup2 (fd, 4); /* { dg-warning "'dup2' on closed file descriptor 'fd'" } */
}
void
test_18 (const char *path, void *buf)
{
int fd = open (path, O_RDWR);
if (fd != -1)
{
int fd2 = dup2 (fd, 3);
read (fd2, buf, 1); /* { dg-warning "'read' on possibly invalid file descriptor 'fd2'" } */
close(fd);
close(fd2);
}
}
void
test_19 (const char *path, void *buf)
{
int fd = open (path, O_WRONLY);
if (fd != -1)
{
int fd2 = dup2 (fd, 4);
if (fd2 != -1)
{
read (fd2, buf, 1); /* { dg-warning "'read' on write-only file descriptor 'fd2'" } */
close(fd2);
}
close (fd);
}
}
extern int m;
void
test_20 ()
{
int fd = dup (m);
close (fd);
}
void
test_21 ()
{
int fd = dup2 (m, 1);
close (fd);
}
void
test_22 (int flags)
{
int fd = dup3 (m, 1, flags);
close (fd);
}
void do_something();
void
test_23 ()
{
int nullfd = -1;
int fd = 1;
if (dup2 (nullfd, fd) < 0) /* { dg-warning "'dup2' on possibly invalid file descriptor 'nullfd'" } */
{
do_something();
}
}
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