From ba2b5321c58c1a7420c7d9d31c1226584537bcaa Mon Sep 17 00:00:00 2001
From: tjg <tjg>
Date: Thu, 25 May 2000 14:31:27 +0000
Subject:   Portability: need special runes for read() returning EIO under job 
  control systems.

---
 ChangeLog |  5 +++++
 input.c   | 10 +++++++++-
 open.c    | 18 ++++++++++++++++++
 proto.h   |  2 ++
 rc.h      |  1 +
 5 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 2a61ade..7f48915 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -674,3 +674,8 @@ Changes since rc-1.5b2
   Bug: fn sigexit wasn't always cleared in child shells.
 
   Bug: `~ () '*'' dumped core.
+
+2000-05-25
+
+  Portability: need special runes for read() returning EIO under job
+  control systems.
diff --git a/input.c b/input.c
index f59f29e..0f649e4 100644
--- a/input.c
+++ b/input.c
@@ -117,10 +117,18 @@ static int fdgchar() {
 				do {
 					r = rc_read(istack->fd, inbuf + 2, BUFSIZE);
 					sigchk();
-					if (errno == EAGAIN) {
+					switch (errno) {
+					case EAGAIN:
 						if (!makeblocking(istack->fd))
 							panic("not O_NONBLOCK");
 						errno = EINTR;
+						break;
+					case EIO:
+						if (makesamepgrp(istack->fd))
+							errno = EINTR;
+						else
+							errno = EIO;
+						break;
 					}
 				} while (r < 0 && errno == EINTR);
 				if (r < 0) {
diff --git a/open.c b/open.c
index bac9f2c..60555b0 100644
--- a/open.c
+++ b/open.c
@@ -43,3 +43,21 @@ extern bool makeblocking(int fd) {
 	}
 	return TRUE;
 }
+
+/* make a file descriptor the same pgrp as us.  Returns TRUE if
+it changes anything. */
+
+extern bool makesamepgrp(int fd) {
+	pid_t grp;
+
+	grp = getpgrp();
+
+	if (tcgetpgrp(fd) == grp)
+		return FALSE;
+
+	if (tcsetpgrp(fd, grp) < 0) {
+		uerror("tcsetgrp");
+		return FALSE;
+	}
+	return TRUE;
+}
diff --git a/proto.h b/proto.h
index 7d2fe2a..517d357 100644
--- a/proto.h
+++ b/proto.h
@@ -79,6 +79,7 @@ extern char *sys_errlist[];
 #else
 /* BSD: fake it. */
 #define setpgid(pid, pgrp) setpgrp(pid, pgrp)
+#define tcgetpgrp(fd, pgrp) ioctl((fd), TIOCGPGRP)
 #define tcsetpgrp(fd, pgrp) ioctl((fd), TIOCSPGRP, &(pgrp))
 #endif
 
@@ -86,6 +87,7 @@ extern char *sys_errlist[];
 
 /* Nothing doing. */
 #define setpgid()
+#define tcgetpgrp()
 #define tcsetpgrp()
 
 #endif /*HAVE_SETPGRP */
diff --git a/rc.h b/rc.h
index f582bd4..1ed5a07 100644
--- a/rc.h
+++ b/rc.h
@@ -305,6 +305,7 @@ extern void restoreblock(Block *);
 /* open.c */
 extern int rc_open(const char *, redirtype);
 extern bool makeblocking(int);
+extern bool makesamepgrp(int);
 
 /* print.c */
 /*
-- 
cgit v1.2.3