Revert "[readline] try clone() if fork() does not work"

This reverts commit 86b999c464.

src/base/auto_pid.cc

@@ -29,7 +29,6 @@
 
 #include "auto_pid.hh"
 
-#include <sys/syscall.h>
 #include <unistd.h>
 
 #include "config.h"
@@ -41,25 +40,10 @@ namespace pid {
 
 bool in_child = false;
 
-pid_t
-fork()
-{
-    auto retval = ::fork();
-
-    if (retval == -1 && errno == ENOSYS) {
-#ifdef SYS_clone
-        log_error("fork() not implemented, trying clone...");
-        retval = syscall(SYS_clone, SIGCHLD, 0);
-#endif
-    }
-
-    return retval;
-}
-
 Result<auto_pid<process_state::running>, std::string>
 from_fork()
 {
-    auto pid = lnav::pid::fork();
+    auto pid = ::fork();
 
     if (pid == -1) {
         return Err(

src/base/auto_pid.hh

@@ -167,10 +167,7 @@ namespace pid {
 
 extern bool in_child;
 
-pid_t fork();
-
 Result<auto_pid<process_state::running>, std::string> from_fork();
-
 }  // namespace pid
 }  // namespace lnav
 

src/grep_proc.cc

@@ -118,7 +118,7 @@ grep_proc<LineType>::start()
         throw error(errno);
     }
 
-    if ((this->gp_child = lnav::pid::fork()) < 0) {
+    if ((this->gp_child = fork()) < 0) {
         throw error(errno);
     }
 

src/lnav_commands.cc

@@ -1857,7 +1857,7 @@ com_pipe_to(exec_context& ec,
 
     auto child_fds = for_child_res.unwrap();
 
-    pid_t child_pid = lnav::pid::fork();
+    pid_t child_pid = fork();
 
     for (auto& child_fd : child_fds) {
         child_fd.after_fork(child_pid);

src/readline_curses.cc

@@ -58,7 +58,6 @@
 
 #include "base/ansi_scrubber.hh"
 #include "base/auto_mem.hh"
-#include "base/auto_pid.hh"
 #include "base/fs_util.hh"
 #include "base/itertools.hh"
 #include "base/lnav_log.hh"
@@ -794,7 +793,7 @@ readline_curses::start()
     this->rc_pty[RCF_MASTER].close_on_exec();
     this->rc_pty[RCF_SLAVE].close_on_exec();
 
-    if ((this->rc_child = lnav::pid::fork()) == -1) {
+    if ((this->rc_child = fork()) == -1) {
         log_error("fork() failed -- %s", strerror(errno));
         throw error(errno);
     }