Restore default SIGPIPE handler before invoking ‘man’

Fixes NixOS/nixpkgs#3410.

2 files changed, 14 insertions, 0 deletions

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index aa9d99ec3353..f762b79c24da 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -927,6 +927,16 @@ void closeOnExec(int fd)
 }
 
 
+void restoreSIGPIPE()
+{
+    struct sigaction act, oact;
+    act.sa_handler = SIG_DFL;
+    act.sa_flags = 0;
+    sigemptyset(&act.sa_mask);
+    if (sigaction(SIGPIPE, &act, &oact)) throw SysError("resetting SIGPIPE");
+}
+
+
 //////////////////////////////////////////////////////////////////////
 
 
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index ad0d377a4f5e..64250c522a52 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -273,6 +273,10 @@ void closeMostFDs(const set<int> & exceptions);
 /* Set the close-on-exec flag for the given file descriptor. */
 void closeOnExec(int fd);
 
+/* Restore default handling of SIGPIPE, otherwise some programs will
+   randomly say "Broken pipe". */
+void restoreSIGPIPE();
+
 
 /* User interruption. */