[git commit 0_9_30] implement daemon() using clone() on no-mmu systems as suggested by Jamie Lokier
Mike Frysinger
vapier at gentoo.org
Sat Oct 10 16:44:02 UTC 2009
commit: http://git.uclibc.org/uClibc/commit/?id=ade3d86f30f5f087ed3da1290d4cbb6168d00fcf
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/0_9_30
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop at gmail.com>
---
include/unistd.h | 2 --
libc/unistd/Makefile.in | 2 --
libc/unistd/daemon.c | 39 ++++++++++++++++++++++++++-------------
3 files changed, 26 insertions(+), 17 deletions(-)
diff --git a/include/unistd.h b/include/unistd.h
index f981d21..3efcf18 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -904,12 +904,10 @@ extern void endusershell (void) __THROW; /* Discard cached info. */
extern void setusershell (void) __THROW; /* Rewind and re-read the file. */
-#ifdef __ARCH_USE_MMU__
/* Put the program in the background, and dissociate from the controlling
terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
redirects stdin, stdout, and stderr to /dev/null. */
extern int daemon (int __nochdir, int __noclose) __THROW __wur;
-#endif
#endif /* Use BSD || X/Open. */
diff --git a/libc/unistd/Makefile.in b/libc/unistd/Makefile.in
index b447a85..3e6ee43 100644
--- a/libc/unistd/Makefile.in
+++ b/libc/unistd/Makefile.in
@@ -14,8 +14,6 @@ CSRC := $(filter-out exec.c,$(CSRC))
ifeq ($(ARCH_USE_MMU),y)
CSRC := $(filter-out __exec_alloc.c,$(CSRC))
-else
-CSRC := $(filter-out daemon.c,$(CSRC))
endif
ifeq ($(UCLIBC_HAS_GNU_GETOPT),y)
diff --git a/libc/unistd/daemon.c b/libc/unistd/daemon.c
index d565ed4..ed6c381 100644
--- a/libc/unistd/daemon.c
+++ b/libc/unistd/daemon.c
@@ -56,27 +56,40 @@ libc_hidden_proto(setsid)
libc_hidden_proto(chdir)
libc_hidden_proto(fork)
+#ifndef __ARCH_USE_MMU__
+#include <sys/syscall.h>
+/* use clone() to get fork() like behavior here -- we just want to disassociate
+ * from the controlling terminal
+ */
+static inline pid_t fork_parent(void)
+{
+ register unsigned long ret = INTERNAL_SYSCALL(clone, wtf, 2, CLONE_VM, 0);
+ if (ret != -1 && ret != 0)
+ /* parent needs to die now w/out touching stack */
+ INTERNAL_SYSCALL(exit, wtf, 0);
+ return ret;
+}
+#else
+static inline pid_t fork_parent(void)
+{
+ switch (fork()) {
+ case -1: return -1;
+ case 0: return 0;
+ default: _exit(0);
+ }
+}
+#endif
+
int daemon( int nochdir, int noclose )
{
int fd;
- switch (fork()) {
- case -1:
- return(-1);
- case 0:
- break;
- default:
- _exit(0);
- }
+ if (fork_parent() == -1)
+ return -1;
if (setsid() == -1)
return(-1);
- /* Make certain we are not a session leader, or else we
- * might reacquire a controlling terminal */
- if (fork())
- _exit(0);
-
if (!nochdir)
chdir("/");
--
1.6.3.3
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