Changes in procfs.c to fix bug with inferior's siginfo struct getting

needlessly stomped.  Changes in elfread.c and solib.c to fix DWARF
processing, broken by other recent changes.

1 files changed, 75 insertions, 17 deletions

diff --git a/gdb/procfs.c b/gdb/procfs.c
index 04fed86..dc5ae10 100644
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -81,6 +81,9 @@ static struct procinfo pi;	/* Inferior's process information */
 
 /* Prototypes for local functions */
 
+static void
+set_proc_siginfo PARAMS ((struct procinfo *, int));
+
 static int
 proc_address_to_fd PARAMS ((CORE_ADDR, int));
 
@@ -759,15 +762,7 @@ detach (signal)
 {
   if (signal)
     {
-      struct siginfo siginfo;
-      siginfo.si_signo = signal;
-      siginfo.si_code = 0;
-      siginfo.si_errno = 0;
-      if (ioctl (pi.fd, PIOCSSIG, &siginfo) < 0)
-	{
-	  print_sys_errmsg (pi.pathname, errno);
-	  printf ("PIOCSSIG failed.\n");
-	}
+      set_proc_siginfo (&pi, signal);
     }
   if (ioctl (pi.fd, PIOCSEXIT, &pi.exitset) < 0)
     {
@@ -979,6 +974,76 @@ proc_wait (statloc)
 
 /*
 
+LOCAL FUNCTION
+
+	set_proc_siginfo - set a process's current signal info
+
+SYNOPSIS
+
+	void set_proc_siginfo (struct procinfo *pip, int signo);
+
+DESCRIPTION
+
+	Given a pointer to a process info struct in PIP and a signal number
+	in SIGNO, set the process's current signal and its associated signal
+	information.  The signal will be delivered to the process immediately
+	after execution is resumed, even if it is being held.  In addition,
+	this particular delivery will not cause another PR_SIGNALLED stop
+	even if the signal is being traced.
+
+	If we are not delivering the same signal that the prstatus siginfo
+	struct contains information about, then synthesize a siginfo struct
+	to match the signal we are doing to deliver, make it of the type
+	"generated by a user process", and send this synthesized copy.  When
+	used to set the inferior's signal state, this will be required if we
+	are not currently stopped because of a traced signal, or if we decide
+	to continue with a different signal.
+
+	Note that when continuing the inferior from a stop due to receipt
+	of a traced signal, we either have set PRCSIG to clear the existing
+	signal, or we have to call this function to do a PIOCSSIG with either
+	the existing siginfo struct from pr_info, or one we have synthesized
+	appropriately for the signal we want to deliver.  Otherwise if the
+	signal is still being traced, the inferior will immediately stop
+	again.
+
+	See siginfo(5) for more details.
+*/
+
+static void
+set_proc_siginfo (pip, signo)
+  struct procinfo *pip;
+  int signo;
+{
+  struct siginfo newsiginfo;
+  struct siginfo *sip;
+
+  if (pip -> valid)
+    {
+      if (signo == pip -> prstatus.pr_info.si_signo)
+	{
+	  sip = &pip -> prstatus.pr_info;
+	}
+      else
+	{
+	  (void) memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));
+	  sip = &newsiginfo;
+	  sip -> si_signo = signo;
+	  sip -> si_code = 0;
+	  sip -> si_errno = 0;
+	  sip -> si_pid = getpid ();
+	  sip -> si_uid = getuid ();
+	}
+      if (ioctl (pip -> fd, PIOCSSIG, sip) < 0)
+	{
+	  print_sys_errmsg (pip -> pathname, errno);
+	  warning ("PIOCSSIG failed");
+	}
+    }
+}
+
+/*
+
 GLOBAL FUNCTION
 
 	child_resume -- resume execution of the inferior process
@@ -1012,14 +1077,7 @@ child_resume (step, signal)
   pi.prrun.pr_vaddr = (caddr_t) *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
   if (signal)
     {
-      if (signal != pi.prstatus.pr_cursig)
-	{
-	  struct siginfo siginfo;
-	  siginfo.si_signo = signal;
-	  siginfo.si_code = 0;
-	  siginfo.si_errno = 0;
-	  (void) ioctl (pi.fd, PIOCSSIG, &siginfo);
-	}
+      set_proc_siginfo (&pi, signal);
     }
   else
     {