Parameterize globals.

PR:		bin/25587 (in part)
MFC after:	3 weeks

11 files changed, 196 insertions, 143 deletions

diff --git a/usr.bin/truss/alpha-fbsd.c b/usr.bin/truss/alpha-fbsd.c
index f3eedcd..4a88ff1 100644
--- a/usr.bin/truss/alpha-fbsd.c
+++ b/usr.bin/truss/alpha-fbsd.c
@@ -60,13 +60,13 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
+#include "truss.h"
 #include "syscall.h"
 
 static int fd = -1;
 static int cpid = -1;
 extern int Procfd;
 
-extern FILE *outfile;
 #include "syscalls.h"
 
 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
@@ -113,7 +113,7 @@ clear_fsc() {
  */
 
 void
-alpha_syscall_entry(int pid, int nargs) {
+alpha_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
   struct reg regs = { { 0 } };
   int syscall;
@@ -122,14 +122,14 @@ alpha_syscall_entry(int pid, int nargs) {
   struct syscall *sc;
   int indir = 0;	/* indirect system call */
 
-  if (fd == -1 || pid != cpid) {
-    sprintf(buf, "/proc/%d/regs", pid);
+  if (fd == -1 || trussinfo->pid != cpid) {
+    sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
       return;
     }
-    cpid = pid;
+    cpid = trussinfo->pid;
   }
 
   clear_fsc();
@@ -152,7 +152,7 @@ alpha_syscall_entry(int pid, int nargs) {
   fsc.name =
     (syscall < 0 || syscall > nsyscalls) ? NULL : syscallnames[syscall];
   if (!fsc.name) {
-    fprintf(outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
   }
 
   if (nargs == 0)
@@ -194,7 +194,7 @@ alpha_syscall_entry(int pid, int nargs) {
     fsc.nargs = sc->nargs;
   } else {
 #if DEBUG
-    fprintf(outfile, "unknown syscall %s -- setting args to %d\n",
+    fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
 	   fsc.name, nargs);
 #endif
     fsc.nargs = nargs;
@@ -235,7 +235,7 @@ alpha_syscall_entry(int pid, int nargs) {
   }
 
 #if DEBUG
-  fprintf(outfile, "\n");
+  fprintf(trussinfo->outfile, "\n");
 #endif
 
   /*
@@ -246,7 +246,7 @@ alpha_syscall_entry(int pid, int nargs) {
    */
 
   if (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit")) {
-    print_syscall(outfile, fsc.name, fsc.nargs, fsc.s_args);
+    print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.s_args);
   }
 
   return;
@@ -259,8 +259,8 @@ alpha_syscall_entry(int pid, int nargs) {
  * the sytem call number instead of, say, an error status).
  */
 
-void
-alpha_syscall_exit(int pid, int syscall) {
+int
+alpha_syscall_exit(struct trussinfo *trussinfo, int syscall) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -268,19 +268,21 @@ alpha_syscall_exit(int pid, int syscall) {
   int errorp;
   struct syscall *sc;
 
-  if (fd == -1 || pid != cpid) {
-    sprintf(buf, "/proc/%d/regs", pid);
+  if (fd == -1 || trussinfo->pid != cpid) {
+    sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
       return;
     }
-    cpid = pid;
+    cpid = trussinfo->pid;
   }
 
   lseek(fd, 0L, 0);
-  if (read(fd, &regs, sizeof(regs)) != sizeof(regs))
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "\n");
     return;
+  }
   retval = regs.r_regs[R_V0];
   errorp = !!(regs.r_regs[R_A3]);
 
@@ -323,8 +325,8 @@ alpha_syscall_exit(int pid, int syscall) {
    * but that complicates things considerably.
    */
 
-  print_syscall_ret(outfile, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);
+  print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);
   clear_fsc();
 
-  return;
+  return (retval);
 }
diff --git a/usr.bin/truss/amd64-fbsd32.c b/usr.bin/truss/amd64-fbsd32.c
index 89110b5..702db80 100644
--- a/usr.bin/truss/amd64-fbsd32.c
+++ b/usr.bin/truss/amd64-fbsd32.c
@@ -58,13 +58,13 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
+#include "truss.h"
 #include "syscall.h"
 
 static int fd = -1;
 static int cpid = -1;
 extern int Procfd;
 
-extern FILE *outfile;
 #include "syscalls.h"
 
 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
@@ -111,7 +111,7 @@ clear_fsc() {
  */
 
 void
-i386_syscall_entry(int pid, int nargs) {
+i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
   struct reg regs = { 0 };
   int syscall;
@@ -119,14 +119,14 @@ i386_syscall_entry(int pid, int nargs) {
   unsigned int parm_offset;
   struct syscall *sc;
 
-  if (fd == -1 || pid != cpid) {
-    sprintf(buf, "/proc/%d/regs", pid);
+  if (fd == -1 || trussinfo->pid != cpid) {
+    sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
       return;
     }
-    cpid = pid;
+    cpid = trussinfo->pid;
   }
 
   clear_fsc();
@@ -157,7 +157,7 @@ i386_syscall_entry(int pid, int nargs) {
   fsc.name =
     (syscall < 0 || syscall > nsyscalls) ? NULL : syscallnames[syscall];
   if (!fsc.name) {
-    fprintf(outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
   }
 
   if (nargs == 0)
@@ -173,7 +173,7 @@ i386_syscall_entry(int pid, int nargs) {
     fsc.nargs = sc->nargs;
   } else {
 #if DEBUG
-    fprintf(outfile, "unknown syscall %s -- setting args to %d\n",
+    fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
 	   fsc.name, nargs);
 #endif
     fsc.nargs = nargs;
@@ -214,7 +214,7 @@ i386_syscall_entry(int pid, int nargs) {
   }
 
 #if DEBUG
-  fprintf(outfile, "\n");
+  fprintf(trussinfo->outfile, "\n");
 #endif
 
   /*
@@ -225,7 +225,7 @@ i386_syscall_entry(int pid, int nargs) {
    */
 
   if (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit")) {
-    print_syscall(outfile, fsc.name, fsc.nargs, fsc.s_args);
+    print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.s_args);
   }
 
   return;
@@ -238,8 +238,8 @@ i386_syscall_entry(int pid, int nargs) {
  * the sytem call number instead of, say, an error status).
  */
 
-void
-i386_syscall_exit(int pid, int syscall) {
+int
+i386_syscall_exit(struct trussinfo *trussinfo, int syscall) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -247,19 +247,21 @@ i386_syscall_exit(int pid, int syscall) {
   int errorp;
   struct syscall *sc;
 
-  if (fd == -1 || pid != cpid) {
-    sprintf(buf, "/proc/%d/regs", pid);
+  if (fd == -1 || trussinfo->pid != cpid) {
+    sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
       return;
     }
-    cpid = pid;
+    cpid = trussinfo->pid;
   }
 
   lseek(fd, 0L, 0);
-  if (read(fd, &regs, sizeof(regs)) != sizeof(regs))
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "\n");
     return;
+  }
   retval = regs.r_eax;
   errorp = !!(regs.r_eflags & PSL_C);
 
@@ -302,8 +304,8 @@ i386_syscall_exit(int pid, int syscall) {
    * but that complicates things considerably.
    */
 
-  print_syscall_ret(outfile, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);
+  print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);
   clear_fsc();
 
-  return;
+  return (retval);
 }
diff --git a/usr.bin/truss/amd64-linux32.c b/usr.bin/truss/amd64-linux32.c
index b493960..e6a560a 100644
--- a/usr.bin/truss/amd64-linux32.c
+++ b/usr.bin/truss/amd64-linux32.c
@@ -55,6 +55,7 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
+#include "truss.h"
 #include "extern.h"
 #include "syscall.h"
 
@@ -62,7 +63,6 @@ static int fd = -1;
 static int cpid = -1;
 extern int Procfd;
 
-extern FILE *outfile;
 #include "linux_syscalls.h"
 
 static int nsyscalls =
@@ -91,21 +91,21 @@ clear_lsc() {
 }
 
 void
-i386_linux_syscall_entry(int pid, int nargs) {
+i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
   struct reg regs = { 0 };
   int syscall;
   int i;
   struct syscall *sc;
 
-  if (fd == -1 || pid != cpid) {
-    sprintf(buf, "/proc/%d/regs", pid);
+  if (fd == -1 || trussinfo->pid != cpid) {
+    sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
       return;
     }
-    cpid = pid;
+    cpid = trussinfo->pid;
   }
 
   clear_lsc();
@@ -117,7 +117,7 @@ i386_linux_syscall_entry(int pid, int nargs) {
   lsc.name =
     (syscall < 0 || syscall > nsyscalls) ? NULL : linux_syscallnames[syscall];
   if (!lsc.name) {
-    fprintf (outfile, "-- UNKNOWN SYSCALL %d\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d\n", syscall);
   }
 
   if (nargs == 0)
@@ -142,7 +142,7 @@ i386_linux_syscall_entry(int pid, int nargs) {
     lsc.nargs = sc->nargs;
   } else {
 #ifdef DEBUG
-    fprintf(outfile, "unknown syscall %s -- setting args to %d\n",
+    fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
 	    lsc.name, nargs);
 #endif
     lsc.nargs = nargs;
@@ -175,7 +175,7 @@ i386_linux_syscall_entry(int pid, int nargs) {
   }
 
   if (!strcmp(lsc.name, "linux_execve") || !strcmp(lsc.name, "exit")) {
-    print_syscall(outfile, lsc.name, lsc.nargs, lsc.s_args);
+    print_syscall(trussinfo, lsc.name, lsc.nargs, lsc.s_args);
   }
 
   return;
@@ -196,8 +196,8 @@ const int bsd_to_linux_errno[] = {
   	-6, 
 };
 
-void
-i386_linux_syscall_exit(int pid, int syscall) {
+int
+i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -205,20 +205,21 @@ i386_linux_syscall_exit(int pid, int syscall) {
   int errorp;
   struct syscall *sc;
 
-  if (fd == -1 || pid != cpid) {
-    sprintf(buf, "/proc/%d/regs", pid);
+  if (fd == -1 || trussinfo->pid != cpid) {
+    sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
       return;
     }
-    cpid = pid;
+    cpid = trussinfo->pid;
   }
 
   lseek(fd, 0L, 0);
-  if (read(fd, &regs, sizeof(regs)) != sizeof(regs))
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "\n");
     return;
-
+  }
   retval = regs.r_eax;
   errorp = !!(regs.r_eflags & PSL_C);
 
@@ -247,8 +248,9 @@ i386_linux_syscall_exit(int pid, int syscall) {
       if (retval == bsd_to_linux_errno[i])
       break;
   }
-  print_syscall_ret(outfile, lsc.name, lsc.nargs, lsc.s_args, errorp,
-    errorp ? i : retval);
+  print_syscall_ret(trussinfo, lsc.name, lsc.nargs, lsc.s_args, errorp,
+                    errorp ? i : retval);
   clear_lsc();
-  return;
+
+  return (retval);
 }
diff --git a/usr.bin/truss/extern.h b/usr.bin/truss/extern.h
index 90bf46e..ea7c435 100644
--- a/usr.bin/truss/extern.h
+++ b/usr.bin/truss/extern.h
@@ -36,12 +36,12 @@ extern int start_tracing(int, int);
 extern void restore_proc(int);
 extern const char *ioctlname(register_t val);
 #ifdef __alpha__
-extern void alpha_syscall_entry(int, int);
-extern void alpha_syscall_exit(int, int);
+extern void alpha_syscall_entry(struct trussinfo *, int);
+extern int alpha_syscall_exit(struct trussinfo *, int);
 #endif
 #ifdef __i386__
-extern void i386_syscall_entry(int, int);
-extern void i386_syscall_exit(int, int);
-extern void i386_linux_syscall_entry(int, int);
-extern void i386_linux_syscall_exit(int, int);
+extern void i386_syscall_entry(struct trussinfo *, int);
+extern int i386_syscall_exit(struct trussinfo *, int);
+extern void i386_linux_syscall_entry(struct trussinfo *, int);
+extern int i386_linux_syscall_exit(struct trussinfo *, int);
 #endif
diff --git a/usr.bin/truss/i386-fbsd.c b/usr.bin/truss/i386-fbsd.c
index 89110b5..702db80 100644
--- a/usr.bin/truss/i386-fbsd.c
+++ b/usr.bin/truss/i386-fbsd.c
@@ -58,13 +58,13 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
+#include "truss.h"
 #include "syscall.h"
 
 static int fd = -1;
 static int cpid = -1;
 extern int Procfd;
 
-extern FILE *outfile;
 #include "syscalls.h"
 
 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
@@ -111,7 +111,7 @@ clear_fsc() {
  */
 
 void
-i386_syscall_entry(int pid, int nargs) {
+i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
   struct reg regs = { 0 };
   int syscall;
@@ -119,14 +119,14 @@ i386_syscall_entry(int pid, int nargs) {
   unsigned int parm_offset;
   struct syscall *sc;
 
-  if (fd == -1 || pid != cpid) {
-    sprintf(buf, "/proc/%d/regs", pid);
+  if (fd == -1 || trussinfo->pid != cpid) {
+    sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
       return;
     }
-    cpid = pid;
+    cpid = trussinfo->pid;
   }
 
   clear_fsc();
@@ -157,7 +157,7 @@ i386_syscall_entry(int pid, int nargs) {
   fsc.name =
     (syscall < 0 || syscall > nsyscalls) ? NULL : syscallnames[syscall];
   if (!fsc.name) {
-    fprintf(outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
   }
 
   if (nargs == 0)
@@ -173,7 +173,7 @@ i386_syscall_entry(int pid, int nargs) {
     fsc.nargs = sc->nargs;
   } else {
 #if DEBUG
-    fprintf(outfile, "unknown syscall %s -- setting args to %d\n",
+    fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
 	   fsc.name, nargs);
 #endif
     fsc.nargs = nargs;
@@ -214,7 +214,7 @@ i386_syscall_entry(int pid, int nargs) {
   }
 
 #if DEBUG
-  fprintf(outfile, "\n");
+  fprintf(trussinfo->outfile, "\n");
 #endif
 
   /*
@@ -225,7 +225,7 @@ i386_syscall_entry(int pid, int nargs) {
    */
 
   if (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit")) {
-    print_syscall(outfile, fsc.name, fsc.nargs, fsc.s_args);
+    print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.s_args);
   }
 
   return;
@@ -238,8 +238,8 @@ i386_syscall_entry(int pid, int nargs) {
  * the sytem call number instead of, say, an error status).
  */
 
-void
-i386_syscall_exit(int pid, int syscall) {
+int
+i386_syscall_exit(struct trussinfo *trussinfo, int syscall) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -247,19 +247,21 @@ i386_syscall_exit(int pid, int syscall) {
   int errorp;
   struct syscall *sc;
 
-  if (fd == -1 || pid != cpid) {
-    sprintf(buf, "/proc/%d/regs", pid);
+  if (fd == -1 || trussinfo->pid != cpid) {
+    sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
       return;
     }
-    cpid = pid;
+    cpid = trussinfo->pid;
   }
 
   lseek(fd, 0L, 0);
-  if (read(fd, &regs, sizeof(regs)) != sizeof(regs))
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "\n");
     return;
+  }
   retval = regs.r_eax;
   errorp = !!(regs.r_eflags & PSL_C);
 
@@ -302,8 +304,8 @@ i386_syscall_exit(int pid, int syscall) {
    * but that complicates things considerably.
    */
 
-  print_syscall_ret(outfile, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);
+  print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);
   clear_fsc();
 
-  return;
+  return (retval);
 }
diff --git a/usr.bin/truss/i386-linux.c b/usr.bin/truss/i386-linux.c
index b493960..e6a560a 100644
--- a/usr.bin/truss/i386-linux.c
+++ b/usr.bin/truss/i386-linux.c
@@ -55,6 +55,7 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
+#include "truss.h"
 #include "extern.h"
 #include "syscall.h"
 
@@ -62,7 +63,6 @@ static int fd = -1;
 static int cpid = -1;
 extern int Procfd;
 
-extern FILE *outfile;
 #include "linux_syscalls.h"
 
 static int nsyscalls =
@@ -91,21 +91,21 @@ clear_lsc() {
 }
 
 void
-i386_linux_syscall_entry(int pid, int nargs) {
+i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
   struct reg regs = { 0 };
   int syscall;
   int i;
   struct syscall *sc;
 
-  if (fd == -1 || pid != cpid) {
-    sprintf(buf, "/proc/%d/regs", pid);
+  if (fd == -1 || trussinfo->pid != cpid) {
+    sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
       return;
     }
-    cpid = pid;
+    cpid = trussinfo->pid;
   }
 
   clear_lsc();
@@ -117,7 +117,7 @@ i386_linux_syscall_entry(int pid, int nargs) {
   lsc.name =
     (syscall < 0 || syscall > nsyscalls) ? NULL : linux_syscallnames[syscall];
   if (!lsc.name) {
-    fprintf (outfile, "-- UNKNOWN SYSCALL %d\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d\n", syscall);
   }
 
   if (nargs == 0)
@@ -142,7 +142,7 @@ i386_linux_syscall_entry(int pid, int nargs) {
     lsc.nargs = sc->nargs;
   } else {
 #ifdef DEBUG
-    fprintf(outfile, "unknown syscall %s -- setting args to %d\n",
+    fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
 	    lsc.name, nargs);
 #endif
     lsc.nargs = nargs;
@@ -175,7 +175,7 @@ i386_linux_syscall_entry(int pid, int nargs) {
   }
 
   if (!strcmp(lsc.name, "linux_execve") || !strcmp(lsc.name, "exit")) {
-    print_syscall(outfile, lsc.name, lsc.nargs, lsc.s_args);
+    print_syscall(trussinfo, lsc.name, lsc.nargs, lsc.s_args);
   }
 
   return;
@@ -196,8 +196,8 @@ const int bsd_to_linux_errno[] = {
   	-6, 
 };
 
-void
-i386_linux_syscall_exit(int pid, int syscall) {
+int
+i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -205,20 +205,21 @@ i386_linux_syscall_exit(int pid, int syscall) {
   int errorp;
   struct syscall *sc;
 
-  if (fd == -1 || pid != cpid) {
-    sprintf(buf, "/proc/%d/regs", pid);
+  if (fd == -1 || trussinfo->pid != cpid) {
+    sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
       return;
     }
-    cpid = pid;
+    cpid = trussinfo->pid;
   }
 
   lseek(fd, 0L, 0);
-  if (read(fd, &regs, sizeof(regs)) != sizeof(regs))
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "\n");
     return;
-
+  }
   retval = regs.r_eax;
   errorp = !!(regs.r_eflags & PSL_C);
 
@@ -247,8 +248,9 @@ i386_linux_syscall_exit(int pid, int syscall) {
       if (retval == bsd_to_linux_errno[i])
       break;
   }
-  print_syscall_ret(outfile, lsc.name, lsc.nargs, lsc.s_args, errorp,
-    errorp ? i : retval);
+  print_syscall_ret(trussinfo, lsc.name, lsc.nargs, lsc.s_args, errorp,
+                    errorp ? i : retval);
   clear_lsc();
-  return;
+
+  return (retval);
 }
diff --git a/usr.bin/truss/main.c b/usr.bin/truss/main.c
index c434d92..503329f 100644
--- a/usr.bin/truss/main.c
+++ b/usr.bin/truss/main.c
@@ -53,16 +53,14 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
+#include "truss.h"
 #include "extern.h"
 
 /*
- * These should really be parameterized -- I don't like having globals,
- * but this is the easiest way, right now, to deal with them.
+ * It's difficult to parameterize this because it must be
+ * accessible in a signal handler.
  */
 
-int pid = 0;
-int nosigs = 0;
-FILE *outfile;
 int Procfd;
 
 static __inline void
@@ -80,8 +78,8 @@ usage(void)
  */
 struct ex_types {
   const char *type;
-  void (*enter_syscall)(int, int);
-  void (*exit_syscall)(int, int);
+  void (*enter_syscall)(struct trussinfo *, int);
+  int (*exit_syscall)(struct trussinfo *, int);
 } ex_types[] = {
 #ifdef __alpha__
   { "FreeBSD ELF", alpha_syscall_entry, alpha_syscall_exit },
@@ -101,13 +99,13 @@ struct ex_types {
  */
 
 static struct ex_types *
-set_etype(void) {
+set_etype(struct trussinfo *trussinfo) {
   struct ex_types *funcs;
   char etype[24];
   char progt[32];
   int fd;
 
-  sprintf(etype, "/proc/%d/etype", pid);
+  sprintf(etype, "/proc/%d/etype", trussinfo->pid);
   if ((fd = open(etype, O_RDONLY)) == -1) {
     strcpy(progt, "FreeBSD a.out");
   } else {
@@ -138,18 +136,25 @@ main(int ac, char **av) {
   int in_exec = 0;
   char *fname = NULL;
   int sigexit = 0;
+  struct trussinfo *trussinfo;
+
+  /* Initialize the trussinfo struct */
+  trussinfo = (struct trussinfo *)malloc(sizeof(struct trussinfo));
+  if (trussinfo == NULL)
+    errx(1, "malloc() failed");
+  bzero(trussinfo, sizeof(struct trussinfo));
+  trussinfo->outfile = stderr;
 
-  outfile = stderr;
   while ((c = getopt(ac, av, "p:o:S")) != -1) {
     switch (c) {
     case 'p':	/* specified pid */
-      pid = atoi(optarg);
+      trussinfo->pid = atoi(optarg);
       break;
     case 'o':	/* Specified output file */
       fname = optarg;
       break;
     case 'S':	/* Don't trace signals */ 
-      nosigs = 1;
+      trussinfo->flags |= NOSIGS;
       break;
     default:
       usage();
@@ -157,11 +162,11 @@ main(int ac, char **av) {
   }
 
   ac -= optind; av += optind;
-  if ((pid == 0 && ac == 0) || (pid != 0 && ac != 0))
+  if ((trussinfo->pid == 0 && ac == 0) || (trussinfo->pid != 0 && ac != 0))
     usage();
 
   if (fname != NULL) { /* Use output file */
-    if ((outfile = fopen(fname, "w")) == NULL)
+    if ((trussinfo->outfile = fopen(fname, "w")) == NULL)
       errx(1, "cannot open %s", fname);
   }
 
@@ -172,9 +177,9 @@ main(int ac, char **av) {
    * then we restore the event mask on these same signals.
    */
 
-  if (pid == 0) {	/* Start a command ourselves */
+  if (trussinfo->pid == 0) {	/* Start a command ourselves */
     command = av;
-    pid = setup_and_wait(command);
+    trussinfo->pid = setup_and_wait(command);
     signal(SIGINT, SIG_IGN);
     signal(SIGTERM, SIG_IGN);
     signal(SIGQUIT, SIG_IGN);
@@ -190,14 +195,15 @@ main(int ac, char **av) {
    * be woken up, either in exit() or in execve().
    */
 
-  Procfd = start_tracing(pid, S_EXEC | S_SCE | S_SCX | S_CORE | S_EXIT |
-		     (nosigs ? 0 : S_SIG));
+  Procfd = start_tracing(
+		trussinfo->pid, S_EXEC | S_SCE | S_SCX | S_CORE | S_EXIT |
+		((trussinfo->flags & NOSIGS) ? 0 : S_SIG));
   if (Procfd == -1)
     return 0;
 
   pfs.why = 0;
 
-  funcs = set_etype();
+  funcs = set_etype(trussinfo);
   /*
    * At this point, it's a simple loop, waiting for the process to
    * stop, finding out why, printing out why, and then continuing it.
@@ -212,7 +218,7 @@ main(int ac, char **av) {
     else {
       switch(i = pfs.why) {
       case S_SCE:
-	funcs->enter_syscall(pid, pfs.val);
+	funcs->enter_syscall(trussinfo, pfs.val);
 	break;
       case S_SCX:
 	/*
@@ -226,32 +232,32 @@ main(int ac, char **av) {
 	  in_exec = 0;
 	  break;
 	}
-	funcs->exit_syscall(pid, pfs.val);
+	funcs->exit_syscall(trussinfo, pfs.val);
 	break;
       case S_SIG:
-	fprintf(outfile, "SIGNAL %lu\n", pfs.val);
+	fprintf(trussinfo->outfile, "SIGNAL %lu\n", pfs.val);
 	sigexit = pfs.val;
 	break;
       case S_EXIT:
-	fprintf (outfile, "process exit, rval = %lu\n", pfs.val);
+	fprintf (trussinfo->outfile, "process exit, rval = %lu\n", pfs.val);
 	break;
       case S_EXEC:
-	funcs = set_etype();
+	funcs = set_etype(trussinfo);
 	in_exec = 1;
 	break;
       default:
-	fprintf (outfile, "Process stopped because of:  %d\n", i);
+	fprintf (trussinfo->outfile, "Process stopped because of:  %d\n", i);
 	break;
       }
     }
     if (ioctl(Procfd, PIOCCONT, val) == -1) {
-      if (kill(pid, 0) == -1 && errno == ESRCH)
+      if (kill(trussinfo->pid, 0) == -1 && errno == ESRCH)
 	break;
       else
 	warn("PIOCCONT");
     }
   } while (pfs.why != S_EXIT);
-  fflush(outfile);
+  fflush(trussinfo->outfile);
   if (sigexit) {
     if (sigexit == SIGQUIT)
       exit(sigexit);
diff --git a/usr.bin/truss/setup.c b/usr.bin/truss/setup.c
index 115ba15..baeb570 100644
--- a/usr.bin/truss/setup.c
+++ b/usr.bin/truss/setup.c
@@ -53,6 +53,7 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
+#include "truss.h"
 #include "extern.h"
 
 static int evflags = 0;
diff --git a/usr.bin/truss/syscall.h b/usr.bin/truss/syscall.h
index 815ae59..b6485f0 100644
--- a/usr.bin/truss/syscall.h
+++ b/usr.bin/truss/syscall.h
@@ -44,5 +44,5 @@ struct syscall {
 struct syscall *get_syscall(const char*);
 char *get_string(int, void*, int);
 char *print_arg(int, struct syscall_args *, unsigned long*);
-void print_syscall(FILE *, const char *, int, char **);
-void print_syscall_ret(FILE *, const char *, int, char **, int, int);
+void print_syscall(struct trussinfo *, const char *, int, char **);
+void print_syscall_ret(struct trussinfo *, const char *, int, char **, int, int);
diff --git a/usr.bin/truss/syscalls.c b/usr.bin/truss/syscalls.c
index 6cd8d0d..432197f 100644
--- a/usr.bin/truss/syscalls.c
+++ b/usr.bin/truss/syscalls.c
@@ -53,6 +53,7 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
+#include "truss.h"
 #include "extern.h"
 #include "syscall.h"
 
@@ -353,28 +354,28 @@ print_arg(int fd, struct syscall_args *sc, unsigned long *args) {
  */
 
 void
-print_syscall(FILE *outfile, const char *name, int nargs, char **s_args) {
+print_syscall(struct trussinfo *trussinfo, const char *name, int nargs, char **s_args) {
   int i;
   int len = 0;
-  len += fprintf(outfile, "%s(", name);
+  len += fprintf(trussinfo->outfile, "%s(", name);
   for (i = 0; i < nargs; i++) {
     if (s_args[i])
-      len += fprintf(outfile, "%s", s_args[i]);
+      len += fprintf(trussinfo->outfile, "%s", s_args[i]);
     else
-      len += fprintf(outfile, "<missing argument>");
-    len += fprintf(outfile, "%s", i < (nargs - 1) ? "," : "");
+      len += fprintf(trussinfo->outfile, "<missing argument>");
+    len += fprintf(trussinfo->outfile, "%s", i < (nargs - 1) ? "," : "");
   }
-  len += fprintf(outfile, ")");
+  len += fprintf(trussinfo->outfile, ")");
   for (i = 0; i < 6 - (len / 8); i++)
-	fprintf(outfile, "\t");
+	fprintf(trussinfo->outfile, "\t");
 }
 
 void
-print_syscall_ret(FILE *outfile, const char *name, int nargs, char **s_args, int errorp, int retval) {
-  print_syscall(outfile, name, nargs, s_args);
+print_syscall_ret(struct trussinfo *trussinfo, const char *name, int nargs, char **s_args, int errorp, int retval) {
+  print_syscall(trussinfo, name, nargs, s_args);
   if (errorp) {
-    fprintf(outfile, " ERR#%d '%s'\n", retval, strerror(retval));
+    fprintf(trussinfo->outfile, " ERR#%d '%s'\n", retval, strerror(retval));
   } else {
-    fprintf(outfile, " = %d (0x%x)\n", retval, retval);
+    fprintf(trussinfo->outfile, " = %d (0x%x)\n", retval, retval);
   }
 }
diff --git a/usr.bin/truss/truss.h b/usr.bin/truss/truss.h
new file mode 100644
index 0000000..24396ad
--- /dev/null
+++ b/usr.bin/truss/truss.h
@@ -0,0 +1,35 @@
+/*
+ * Copryight 2001 Jamey Wood
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#define NOSIGS             0x00000008
+
+struct trussinfo
+{
+	int pid;
+	int flags;
+	FILE *outfile;
+};