Create a dummy pipe descriptor instead of opening /dev/null
* strace.c (open_dev_null): Rename to open_dummy_desc. All callers
changed. Create a pipe and return its first descriptor instead of
opening /dev/null.
diff --git a/strace.c b/strace.c
index 90c64e3..785cc60 100644
--- a/strace.c
+++ b/strace.c
@@ -1184,14 +1184,15 @@
perror_msg_and_die("exec");
}
-static int open_dev_null(void)
+static int
+open_dummy_desc(void)
{
- int fd = open("/dev/null", O_RDWR);
- if (fd < 0) /* /dev not populated? Give me _something_... */
- fd = open("/", O_RDWR);
- if (fd < 0) /* shouldn't happen... */
- perror_msg_and_die("Can't open '/'");
- return fd;
+ int fds[2];
+
+ if (pipe(fds))
+ perror_msg_and_die("pipe");
+ close(fds[1]);
+ return fds[0];
}
static void
@@ -1375,7 +1376,7 @@
* will reuse them, unexpectedly making a newly opened object "stdin").
*/
close(0);
- open_dev_null(); /* opens to fd#0 */
+ open_dummy_desc(); /* opens to fd#0 */
dup2(0, 1);
#if 0
/* A good idea too, but we sometimes need to print error messages */
@@ -1735,7 +1736,7 @@
* therefore LOG gets opened to fd#1, and fd#1 is closed by
* "don't hold up stdin/out open" code soon after.
*/
- int fd = open_dev_null();
+ int fd = open_dummy_desc();
while (fd >= 0 && fd < 2)
fd = dup(fd);
if (fd > 2)
