shod

commit 9f57eda3e2c4ee7d3374fde90e8c0de85567cbdc
parent 2d35ae73b14432458565d4bd886e3faec7943b99
Author: seninha <lucas@seninha.org>
Date:   Tue, 21 Jun 2022 18:00:17 -0300

add autostart script read from stdin

Diffstat:
M
shod.1
 | 
7
+++++++
M
shod.c
 | 
45
+++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 52 insertions(+), 0 deletions(-)
diff --git a/shod.1 b/shod.1
@@ -60,6 +60,9 @@ a controller called
 .IR shodc (1)
 to control shod).
 .PP
+.B shod
+passes its standard input to the shell after initializing itself.
+.PP
 The options are as follows:
 .TP
 .B \-c
@@ -687,6 +690,10 @@ The following environment variables affect the execution of
 The display to start
 .B shod
 on.
+.TP
+.B SHELL
+The shell to run with
+.IR exec (3).
 .SH SEE ALSO
 .IR X (1),
 .IR xprompt (1),
diff --git a/shod.c b/shod.c
@@ -1,3 +1,5 @@
+#include <sys/wait.h>
+
 #include <err.h>
 #include <limits.h>
 #include <locale.h>
@@ -6,6 +8,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+
 #include <X11/Xlib.h>
 #include <X11/Xatom.h>
 #include <X11/Xproto.h>
@@ -17,6 +20,8 @@
 #include <X11/extensions/Xrender.h>
 #include <X11/Xft/Xft.h>
 
+#define SHELL                   "SHELL"
+#define DEF_SHELL               "sh"
 #define DIV                     15      /* see containerplace() for details */
 #define IGNOREUNMAP             6       /* number of unmap notifies to ignore while scanning existing clients */
 #define NAMEMAXLEN              1024    /* maximum length of window's name */
@@ -632,6 +637,26 @@ ecalloc(size_t nmemb, size_t size)
 	return p;
 }
 
+/* call fork checking for error; exit on error */
+static pid_t
+efork(void)
+{
+	pid_t pid;
+
+	if ((pid = fork()) < 0)
+		err(1, "fork");
+	return pid;
+}
+
+/* call execlp checking for error; exit on error */
+static void
+eexec(const char *cmd)
+{
+	if (execlp(cmd, cmd, NULL) == -1) {
+		err(1, "%s", cmd);
+	}
+}
+
 /* get color from color string */
 static unsigned long
 ealloccolor(const char *s)
@@ -6461,6 +6486,23 @@ xeventunmapnotify(XEvent *e)
 	ewmhsetclientsstacking();
 }
 
+/* run stdin on sh */
+static void
+autostart(void)
+{
+	pid_t pid;
+	char *shell;
+
+	if ((shell = getenv(SHELL)) == NULL)
+		shell = DEF_SHELL;
+	if ((pid = efork()) == 0) {
+		if (efork() == 0)
+			eexec(shell);
+		exit(0);
+	}
+	waitpid(pid, NULL, 0);
+}
+
 /* destroy dummy windows */
 static void
 cleandummywindows(void)
@@ -6586,6 +6628,9 @@ main(int argc, char *argv[])
 	ewmhsetclientsstacking();
 	ewmhsetactivewindow(None);
 
+	/* run stdin on sh */
+	autostart();
+
 	/* scan windows */
 	scan();
 	mapfocuswin();