filter-branch: stop special-casing $filter_subdir argument

[git.git] / pager.c

diff --git a/pager.c b/pager.c
index 0b7e55f476ac17609d88821e78bd89a511f4b3aa..86facec7b417b26a7dbd9b3c1338149fcecd5588 100644 (file)
--- a/pager.c
+++ b/pager.c
@@ -1,4 +1,6 @@
 #include "cache.h"
+#include "run-command.h"
+#include "sigchain.h"
 
 /*
  * This is split up from the rest of git so that we can do
@@ -7,8 +9,8 @@
 
 static int spawned_pager;
 
-#ifndef __MINGW32__
-static void run_pager(const char *pager)
+#ifndef WIN32
+static void pager_preexec(void)
 {
        /*
         * Work around bug in "less" by not starting it until we
@@ -19,18 +21,12 @@ static void run_pager(const char *pager)
        FD_ZERO(&in);
        FD_SET(0, &in);
        select(1, &in, NULL, &in, NULL);
-
-       execlp(pager, pager, NULL);
-       execl("/bin/sh", "sh", "-c", pager, NULL);
 }
-#else
-#include "run-command.h"
+#endif
 
 static const char *pager_argv[] = { "sh", "-c", NULL, NULL };
-static struct child_process pager_process = {
-       .argv = pager_argv,
-       .in = -1
-};
+static struct child_process pager_process;
+
 static void wait_for_pager(void)
 {
        fflush(stdout);
@@ -40,14 +36,16 @@ static void wait_for_pager(void)
        close(2);
        finish_command(&pager_process);
 }
-#endif
+
+static void wait_for_pager_signal(int signo)
+{
+       wait_for_pager();
+       sigchain_pop(signo);
+       raise(signo);
+}
 
 void setup_pager(void)
 {
-#ifndef __MINGW32__
-       pid_t pid;
-       int fd[2];
-#endif
        const char *pager = getenv("GIT_PAGER");
 
        if (!isatty(1))
@@ -66,37 +64,17 @@ void setup_pager(void)
 
        spawned_pager = 1; /* means we are emitting to terminal */
 
-#ifndef __MINGW32__
-       if (pipe(fd) < 0)
-               return;
-       pid = fork();
-       if (pid < 0) {
-               close(fd[0]);
-               close(fd[1]);
-               return;
-       }
-
-       /* return in the child */
-       if (!pid) {
-               dup2(fd[1], 1);
-               dup2(fd[1], 2);
-               close(fd[0]);
-               close(fd[1]);
-               return;
-       }
-
-       /* The original process turns into the PAGER */
-       dup2(fd[0], 0);
-       close(fd[0]);
-       close(fd[1]);
-
-       setenv("LESS", "FRSX", 0);
-       run_pager(pager);
-       die("unable to execute pager '%s'", pager);
-       exit(255);
-#else
        /* spawn the pager */
        pager_argv[2] = pager;
+       pager_process.argv = pager_argv;
+       pager_process.in = -1;
+       if (!getenv("LESS")) {
+               static const char *env[] = { "LESS=FRSX", NULL };
+               pager_process.env = env;
+       }
+#ifndef WIN32
+       pager_process.preexec_cb = pager_preexec;
+#endif
        if (start_command(&pager_process))
                return;
 
@@ -107,8 +85,8 @@ void setup_pager(void)
        close(pager_process.in);
 
        /* this makes sure that the parent terminates after the pager */
+       sigchain_push_common(wait_for_pager_signal);
        atexit(wait_for_pager);
-#endif
 }
 
 int pager_in_use(void)