Add docs and nohup/unlink utitiliesHEADmaster

8 files changed, 99 insertions, 12 deletions

diff --git a/bin/Kbuild b/bin/Kbuild
index b06279b2..13856f53 100644
--- a/bin/Kbuild
+++ b/bin/Kbuild
@@ -4,8 +4,10 @@ obj-$(CONFIG_BIN_ECHO)     += echo/
 obj-$(CONFIG_BIN_FALSE)    += false/
 obj-$(CONFIG_BIN_FREE)     += free/
 obj-$(CONFIG_BIN_GZIP)     += gzip/
+obj-$(CONFIG_BIN_NOHUP)    += nohup/
 obj-$(CONFIG_BIN_PWD)      += pwd/
 obj-$(CONFIG_BIN_SLEEP)    += sleep/
 obj-$(CONFIG_BIN_SYNC)     += sync/
 obj-$(CONFIG_BIN_TRUE)     += true/
 obj-$(CONFIG_BIN_YES)      += yes/
+obj-$(CONFIG_BIN_UNLINK)   += unlink/
diff --git a/bin/Kconfig b/bin/Kconfig
index 67e4e63d..325e6ab3 100644
--- a/bin/Kconfig
+++ b/bin/Kconfig
@@ -48,4 +48,18 @@ config BIN_TRUE
     help
       Build/Add the 'true' command which returns a zero exit status.
 
+config BIN_NOHUP
+    bool "nohup"
+    default y
+    depends on LIB_LIBC
+    help
+      Build/Add the 'nohup' command which returns a zero exit status.
+
+config BIN_UNLINK
+    bool "unlink"
+    default y
+    depends on LIB_LIBC
+    help
+      Build/Add the 'unlink' command which returns a zero exit status.
+
 endmenu
diff --git a/bin/nohup/Kbuild b/bin/nohup/Kbuild
new file mode 100644
index 00000000..2214faf1
--- /dev/null
+++ b/bin/nohup/Kbuild
@@ -0,0 +1,3 @@
+bin-y := nohup
+obj-y += nohup.o
+libs-y += $(srctree)/lib/libc/libc.a
diff --git a/bin/nohup/nohup.c b/bin/nohup/nohup.c
new file mode 100644
index 00000000..8a6171eb
--- /dev/null
+++ b/bin/nohup/nohup.c
@@ -0,0 +1,47 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(int argc, char **argv)
+{
+	int fildes;
+
+	if (argc < 2) {
+		write(STDOUT_FILENO, "nohup utility [argument...]\n", 29);
+		return 1;
+	}
+
+	if (signal(SIGHUP, SIG_IGN) == SIG_ERR) {
+		perror("nohup: signal");
+		return 1;
+	}
+
+	if (isatty(STDOUT_FILENO)) {
+		fildes = open("nohup.out", O_WRONLY | O_APPEND | O_CREAT);
+		if (fildes < 0) {
+			perror("nohup: open");
+			return 1;
+		}
+
+		if (dup2(fildes, STDOUT_FILENO) < 0) {
+			perror("nohup: dup2");
+			return 1;
+		}
+
+		close(fildes);
+	}
+
+	if (isatty(STDERR_FILENO)) {
+		if (dup2(STDOUT_FILENO, STDERR_FILENO) < 0) {
+			perror("nohup: dup2");
+			return 1;
+		}
+	}
+
+	execvp(argv[0], argv);
+	perror("nohup: execvp");
+	return 127 + (errno == ENOENT);
+}
diff --git a/bin/playground/Kbuild b/bin/playground/Kbuild
deleted file mode 100644
index d9c08784..00000000
--- a/bin/playground/Kbuild
+++ /dev/null
@@ -1,6 +0,0 @@
-bin-y := main
-obj-y := main.o
-
-cflags-y += -fblocks
-
-libs-y := $(srctree)/lib/libc/libc.a
diff --git a/bin/playground/main.c b/bin/playground/main.c
deleted file mode 100644
index a6dab69a..00000000
--- a/bin/playground/main.c
+++ /dev/null
@@ -1,6 +0,0 @@
-/* Place where code from libs can be tested */
-
-int main(void)
-{
-	return 0;
-}
diff --git a/bin/unlink/Kbuild b/bin/unlink/Kbuild
new file mode 100644
index 00000000..91be1b03
--- /dev/null
+++ b/bin/unlink/Kbuild
@@ -0,0 +1,3 @@
+bin-y  := unlink
+obj-y  += unlink.o
+libs-y += $(srctree)/lib/libc/libc.a
diff --git a/bin/unlink/unlink.c b/bin/unlink/unlink.c
new file mode 100644
index 00000000..ae2a6da2
--- /dev/null
+++ b/bin/unlink/unlink.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char **argv)
+{
+	char opt;
+
+	while ((opt = getopt(argc, argv, "")) != -1) {
+		switch (opt) {
+		default:
+			goto usage;
+			return 1;
+		}
+	}
+
+	if (argc != 2) {
+		goto usage;
+		return 1;
+	}
+
+	if (unlink(argv[1]) == -1) {
+		perror("unlink: ");
+		return 1;
+	}
+
+	return 0;
+usage:
+	write(STDERR_FILENO, "usage: unlink file\n", 10);
+	return 0;
+}