Various cleanups of truss:

1) Missing include.
2) Constness.
3) ANSIfication.
4) Avoid some shadowing.
5) Add/clarify some error messages.
6) Some int functions were using return without a value.
7) Mark some parameters as unused.
8) Cast a value we know is non-negative to a size_t before comparing.

6 files changed, 121 insertions, 97 deletions

diff --git a/usr.bin/truss/alpha-fbsd.c b/usr.bin/truss/alpha-fbsd.c
index 60c62e1..5d8b5c2 100644
--- a/usr.bin/truss/alpha-fbsd.c
+++ b/usr.bin/truss/alpha-fbsd.c
@@ -63,6 +63,7 @@ static const char rcsid[] =
 
 #include "truss.h"
 #include "syscall.h"
+#include "extern.h"
 
 static int fd = -1;
 static int cpid = -1;
@@ -83,7 +84,7 @@ static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
  */
 static struct freebsd_syscall {
 	struct syscall *sc;
-	char *name;
+	const char *name;
 	int number;
 	unsigned long *args;
 	int nargs;	/* number of arguments -- *not* number of words! */
@@ -92,7 +93,7 @@ static struct freebsd_syscall {
 
 /* Clear up and free parts of the fsc structure. */
 static __inline void
-clear_fsc() {
+clear_fsc(void) {
   if (fsc.args) {
     free(fsc.args);
   }
@@ -116,8 +117,8 @@ clear_fsc() {
 void
 alpha_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
-  struct reg regs = { { 0 } };
-  int syscall;
+  struct reg regs;
+  int syscall_num;
   int i;
   unsigned int parm_offset;
   struct syscall *sc;
@@ -127,7 +128,7 @@ alpha_syscall_entry(struct trussinfo *trussinfo, int nargs) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
       return;
     }
     cpid = trussinfo->pid;
@@ -135,7 +136,10 @@ alpha_syscall_entry(struct trussinfo *trussinfo, int nargs) {
 
   clear_fsc();
   lseek(fd, 0L, 0);
-  i = read(fd, &regs, sizeof(regs));
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+    return;
+  }
   parm_offset = regs.r_regs[R_SP] + sizeof(int);
 
   /*
@@ -143,17 +147,17 @@ alpha_syscall_entry(struct trussinfo *trussinfo, int nargs) {
    * SYS_syscall, and SYS___syscall.  The former is the old syscall()
    * routine, basicly; the latter is for quad-aligned arguments.
    */
-  syscall = regs.r_regs[R_V0];
-  if (syscall == SYS_syscall || syscall == SYS___syscall) {
+  syscall_num = regs.r_regs[R_V0];
+  if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) {
     indir = 1;
-    syscall = regs.r_regs[R_A0];
+    syscall_num = regs.r_regs[R_A0];
   }
 
-  fsc.number = syscall;
+  fsc.number = syscall_num;
   fsc.name =
-    (syscall < 0 || syscall > nsyscalls) ? NULL : syscallnames[syscall];
+    (syscall_num < 0 || syscall_num > nsyscalls) ? NULL : syscallnames[syscall_num];
   if (!fsc.name) {
-    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
   }
 
   if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
@@ -288,7 +292,7 @@ alpha_syscall_entry(struct trussinfo *trussinfo, int nargs) {
  */
 
 int
-alpha_syscall_exit(struct trussinfo *trussinfo, int syscall) {
+alpha_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -300,8 +304,8 @@ alpha_syscall_exit(struct trussinfo *trussinfo, int syscall) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
-      return;
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
+      return (-1);
     }
     cpid = trussinfo->pid;
   }
@@ -309,7 +313,7 @@ alpha_syscall_exit(struct trussinfo *trussinfo, int syscall) {
   lseek(fd, 0L, 0);
   if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
     fprintf(trussinfo->outfile, "\n");
-    return;
+    return (-1);
   }
   retval = regs.r_regs[R_V0];
   errorp = !!(regs.r_regs[R_A3]);
diff --git a/usr.bin/truss/amd64-fbsd32.c b/usr.bin/truss/amd64-fbsd32.c
index 8a3537b..95e0dfb 100644
--- a/usr.bin/truss/amd64-fbsd32.c
+++ b/usr.bin/truss/amd64-fbsd32.c
@@ -61,6 +61,7 @@ static const char rcsid[] =
 
 #include "truss.h"
 #include "syscall.h"
+#include "extern.h"
 
 static int fd = -1;
 static int cpid = -1;
@@ -81,7 +82,7 @@ static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
  */
 static struct freebsd_syscall {
 	struct syscall *sc;
-	char *name;
+	const char *name;
 	int number;
 	unsigned long *args;
 	int nargs;	/* number of arguments -- *not* number of words! */
@@ -90,7 +91,7 @@ static struct freebsd_syscall {
 
 /* Clear up and free parts of the fsc structure. */
 static __inline void
-clear_fsc() {
+clear_fsc(void) {
   if (fsc.args) {
     free(fsc.args);
   }
@@ -114,8 +115,8 @@ clear_fsc() {
 void
 i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
-  struct reg regs = { 0 };
-  int syscall;
+  struct reg regs;
+  int syscall_num;
   int i;
   unsigned int parm_offset;
   struct syscall *sc;
@@ -124,7 +125,7 @@ i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
       return;
     }
     cpid = trussinfo->pid;
@@ -132,7 +133,10 @@ i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
 
   clear_fsc();
   lseek(fd, 0L, 0);
-  i = read(fd, &regs, sizeof(regs));
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+    return;
+  }
   parm_offset = regs.r_esp + sizeof(int);
 
   /*
@@ -140,25 +144,25 @@ i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
    * SYS_syscall, and SYS___syscall.  The former is the old syscall()
    * routine, basicly; the latter is for quad-aligned arguments.
    */
-  syscall = regs.r_eax;
-  switch (syscall) {
+  syscall_num = regs.r_eax;
+  switch (syscall_num) {
   case SYS_syscall:
     lseek(Procfd, parm_offset, SEEK_SET);
-    read(Procfd, &syscall, sizeof(int));
+    read(Procfd, &syscall_num, sizeof(int));
     parm_offset += sizeof(int);
     break;
   case SYS___syscall:
     lseek(Procfd, parm_offset, SEEK_SET);
-    read(Procfd, &syscall, sizeof(int));
+    read(Procfd, &syscall_num, sizeof(int));
     parm_offset += sizeof(quad_t);
     break;
   }
 
-  fsc.number = syscall;
+  fsc.number = syscall_num;
   fsc.name =
-    (syscall < 0 || syscall > nsyscalls) ? NULL : syscallnames[syscall];
+    (syscall_num < 0 || syscall_num > nsyscalls) ? NULL : syscallnames[syscall_num];
   if (!fsc.name) {
-    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
   }
 
   if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
@@ -267,7 +271,7 @@ i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
  */
 
 int
-i386_syscall_exit(struct trussinfo *trussinfo, int syscall) {
+i386_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -279,16 +283,16 @@ i386_syscall_exit(struct trussinfo *trussinfo, int syscall) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
-      return;
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
+      return (-1);
     }
     cpid = trussinfo->pid;
   }
 
   lseek(fd, 0L, 0);
   if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
-    fprintf(trussinfo->outfile, "\n");
-    return;
+    fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+    return (-1);
   }
   retval = regs.r_eax;
   errorp = !!(regs.r_eflags & PSL_C);
diff --git a/usr.bin/truss/amd64-linux32.c b/usr.bin/truss/amd64-linux32.c
index 908d833..e2f17e7 100644
--- a/usr.bin/truss/amd64-linux32.c
+++ b/usr.bin/truss/amd64-linux32.c
@@ -58,6 +58,7 @@ static const char rcsid[] =
 
 #include "truss.h"
 #include "syscall.h"
+#include "extern.h"
 
 static int fd = -1;
 static int cpid = -1;
@@ -79,7 +80,7 @@ static int nsyscalls =
  */
 static struct linux_syscall {
 	struct syscall *sc;
-	char *name;
+	const char *name;
 	int number;
 	unsigned long args[5];
 	int nargs;	/* number of arguments -- *not* number of words! */
@@ -88,7 +89,7 @@ static struct linux_syscall {
 
 /* Clear up and free parts of the fsc structure. */
 static __inline void
-clear_fsc() {
+clear_fsc(void) {
   if (fsc.s_args) {
     int i;
     for (i = 0; i < fsc.nargs; i++)
@@ -109,8 +110,8 @@ clear_fsc() {
 void
 i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
-  struct reg regs = { 0 };
-  int syscall;
+  struct reg regs;
+  int syscall_num;
   int i;
   struct syscall *sc;
 
@@ -118,7 +119,7 @@ i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
       return;
     }
     cpid = trussinfo->pid;
@@ -126,14 +127,17 @@ i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
 
   clear_fsc();
   lseek(fd, 0L, 0);
-  i = read(fd, &regs, sizeof(regs));
-  syscall = regs.r_eax;
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+    return;
+  }
+  syscall_num = regs.r_eax;
 
-  fsc.number = syscall;
+  fsc.number = syscall_num;
   fsc.name =
-    (syscall < 0 || syscall > nsyscalls) ? NULL : linux_syscallnames[syscall];
+    (syscall_num < 0 || syscall_num > nsyscalls) ? NULL : linux_syscallnames[syscall_num];
   if (!fsc.name) {
-    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
   }
 
   if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
@@ -258,7 +262,7 @@ const int bsd_to_linux_errno[] = {
 };
 
 int
-i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
+i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -270,8 +274,8 @@ i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
-      return;
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
+      return (-1);
     }
     cpid = trussinfo->pid;
   }
@@ -279,7 +283,7 @@ i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
   lseek(fd, 0L, 0);
   if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
     fprintf(trussinfo->outfile, "\n");
-    return;
+    return (-1);
   }
   retval = regs.r_eax;
   errorp = !!(regs.r_eflags & PSL_C);
@@ -323,7 +327,7 @@ i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
    * but that complicates things considerably.
    */
   if (errorp) {
-    for (i = 0; i < sizeof(bsd_to_linux_errno) / sizeof(int); i++)
+    for (i = 0; (size_t)i < sizeof(bsd_to_linux_errno) / sizeof(int); i++)
       if (retval == bsd_to_linux_errno[i])
       break;
   }
diff --git a/usr.bin/truss/i386-fbsd.c b/usr.bin/truss/i386-fbsd.c
index 8a3537b..95e0dfb 100644
--- a/usr.bin/truss/i386-fbsd.c
+++ b/usr.bin/truss/i386-fbsd.c
@@ -61,6 +61,7 @@ static const char rcsid[] =
 
 #include "truss.h"
 #include "syscall.h"
+#include "extern.h"
 
 static int fd = -1;
 static int cpid = -1;
@@ -81,7 +82,7 @@ static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
  */
 static struct freebsd_syscall {
 	struct syscall *sc;
-	char *name;
+	const char *name;
 	int number;
 	unsigned long *args;
 	int nargs;	/* number of arguments -- *not* number of words! */
@@ -90,7 +91,7 @@ static struct freebsd_syscall {
 
 /* Clear up and free parts of the fsc structure. */
 static __inline void
-clear_fsc() {
+clear_fsc(void) {
   if (fsc.args) {
     free(fsc.args);
   }
@@ -114,8 +115,8 @@ clear_fsc() {
 void
 i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
-  struct reg regs = { 0 };
-  int syscall;
+  struct reg regs;
+  int syscall_num;
   int i;
   unsigned int parm_offset;
   struct syscall *sc;
@@ -124,7 +125,7 @@ i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
       return;
     }
     cpid = trussinfo->pid;
@@ -132,7 +133,10 @@ i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
 
   clear_fsc();
   lseek(fd, 0L, 0);
-  i = read(fd, &regs, sizeof(regs));
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+    return;
+  }
   parm_offset = regs.r_esp + sizeof(int);
 
   /*
@@ -140,25 +144,25 @@ i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
    * SYS_syscall, and SYS___syscall.  The former is the old syscall()
    * routine, basicly; the latter is for quad-aligned arguments.
    */
-  syscall = regs.r_eax;
-  switch (syscall) {
+  syscall_num = regs.r_eax;
+  switch (syscall_num) {
   case SYS_syscall:
     lseek(Procfd, parm_offset, SEEK_SET);
-    read(Procfd, &syscall, sizeof(int));
+    read(Procfd, &syscall_num, sizeof(int));
     parm_offset += sizeof(int);
     break;
   case SYS___syscall:
     lseek(Procfd, parm_offset, SEEK_SET);
-    read(Procfd, &syscall, sizeof(int));
+    read(Procfd, &syscall_num, sizeof(int));
     parm_offset += sizeof(quad_t);
     break;
   }
 
-  fsc.number = syscall;
+  fsc.number = syscall_num;
   fsc.name =
-    (syscall < 0 || syscall > nsyscalls) ? NULL : syscallnames[syscall];
+    (syscall_num < 0 || syscall_num > nsyscalls) ? NULL : syscallnames[syscall_num];
   if (!fsc.name) {
-    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
   }
 
   if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
@@ -267,7 +271,7 @@ i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
  */
 
 int
-i386_syscall_exit(struct trussinfo *trussinfo, int syscall) {
+i386_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -279,16 +283,16 @@ i386_syscall_exit(struct trussinfo *trussinfo, int syscall) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
-      return;
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
+      return (-1);
     }
     cpid = trussinfo->pid;
   }
 
   lseek(fd, 0L, 0);
   if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
-    fprintf(trussinfo->outfile, "\n");
-    return;
+    fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+    return (-1);
   }
   retval = regs.r_eax;
   errorp = !!(regs.r_eflags & PSL_C);
diff --git a/usr.bin/truss/i386-linux.c b/usr.bin/truss/i386-linux.c
index 908d833..e2f17e7 100644
--- a/usr.bin/truss/i386-linux.c
+++ b/usr.bin/truss/i386-linux.c
@@ -58,6 +58,7 @@ static const char rcsid[] =
 
 #include "truss.h"
 #include "syscall.h"
+#include "extern.h"
 
 static int fd = -1;
 static int cpid = -1;
@@ -79,7 +80,7 @@ static int nsyscalls =
  */
 static struct linux_syscall {
 	struct syscall *sc;
-	char *name;
+	const char *name;
 	int number;
 	unsigned long args[5];
 	int nargs;	/* number of arguments -- *not* number of words! */
@@ -88,7 +89,7 @@ static struct linux_syscall {
 
 /* Clear up and free parts of the fsc structure. */
 static __inline void
-clear_fsc() {
+clear_fsc(void) {
   if (fsc.s_args) {
     int i;
     for (i = 0; i < fsc.nargs; i++)
@@ -109,8 +110,8 @@ clear_fsc() {
 void
 i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
-  struct reg regs = { 0 };
-  int syscall;
+  struct reg regs;
+  int syscall_num;
   int i;
   struct syscall *sc;
 
@@ -118,7 +119,7 @@ i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
       return;
     }
     cpid = trussinfo->pid;
@@ -126,14 +127,17 @@ i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
 
   clear_fsc();
   lseek(fd, 0L, 0);
-  i = read(fd, &regs, sizeof(regs));
-  syscall = regs.r_eax;
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+    return;
+  }
+  syscall_num = regs.r_eax;
 
-  fsc.number = syscall;
+  fsc.number = syscall_num;
   fsc.name =
-    (syscall < 0 || syscall > nsyscalls) ? NULL : linux_syscallnames[syscall];
+    (syscall_num < 0 || syscall_num > nsyscalls) ? NULL : linux_syscallnames[syscall_num];
   if (!fsc.name) {
-    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
   }
 
   if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
@@ -258,7 +262,7 @@ const int bsd_to_linux_errno[] = {
 };
 
 int
-i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
+i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -270,8 +274,8 @@ i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
-      return;
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
+      return (-1);
     }
     cpid = trussinfo->pid;
   }
@@ -279,7 +283,7 @@ i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
   lseek(fd, 0L, 0);
   if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
     fprintf(trussinfo->outfile, "\n");
-    return;
+    return (-1);
   }
   retval = regs.r_eax;
   errorp = !!(regs.r_eflags & PSL_C);
@@ -323,7 +327,7 @@ i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
    * but that complicates things considerably.
    */
   if (errorp) {
-    for (i = 0; i < sizeof(bsd_to_linux_errno) / sizeof(int); i++)
+    for (i = 0; (size_t)i < sizeof(bsd_to_linux_errno) / sizeof(int); i++)
       if (retval == bsd_to_linux_errno[i])
       break;
   }
diff --git a/usr.bin/truss/sparc64-fbsd.c b/usr.bin/truss/sparc64-fbsd.c
index 552eb60..9fc1db6 100644
--- a/usr.bin/truss/sparc64-fbsd.c
+++ b/usr.bin/truss/sparc64-fbsd.c
@@ -66,6 +66,7 @@ static const char rcsid[] =
 
 #include "truss.h"
 #include "syscall.h"
+#include "extern.h"
 
 static int fd = -1;
 static int cpid = -1;
@@ -86,7 +87,7 @@ static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
  */
 static struct freebsd_syscall {
 	struct syscall *sc;
-	char *name;
+	const char *name;
 	int number;
 	unsigned long *args;
 	int nargs;	/* number of arguments -- *not* number of words! */
@@ -95,7 +96,7 @@ static struct freebsd_syscall {
 
 /* Clear up and free parts of the fsc structure. */
 static __inline void
-clear_fsc() {
+clear_fsc(void) {
   if (fsc.args) {
     free(fsc.args);
   }
@@ -120,7 +121,7 @@ void
 sparc64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   char buf[32];
   struct reg regs;
-  int syscall;
+  int syscall_num;
   int i;
   struct syscall *sc;
   int indir = 0;	/* indirect system call */
@@ -129,7 +130,7 @@ sparc64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDWR);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
       return;
     }
     cpid = trussinfo->pid;
@@ -137,24 +138,27 @@ sparc64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
 
   clear_fsc();
   lseek(fd, 0L, 0);
-  i = read(fd, &regs, sizeof(regs));
+  if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
+    fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+    return;
+  }
 
   /*
    * FreeBSD has two special kinds of system call redirctions --
    * SYS_syscall, and SYS___syscall.  The former is the old syscall()
    * routine, basicly; the latter is for quad-aligned arguments.
    */
-  syscall = regs.r_global[1];
-  if (syscall == SYS_syscall || syscall == SYS___syscall) {
+  syscall_num = regs.r_global[1];
+  if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) {
     indir = 1;
-    syscall = regs.r_out[0];
+    syscall_num = regs.r_out[0];
   }
 
-  fsc.number = syscall;
+  fsc.number = syscall_num;
   fsc.name =
-    (syscall < 0 || syscall > nsyscalls) ? NULL : syscallnames[syscall];
+    (syscall_num < 0 || syscall_num > nsyscalls) ? NULL : syscallnames[syscall_num];
   if (!fsc.name) {
-    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
+    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
   }
 
   if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
@@ -290,7 +294,7 @@ sparc64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
  */
 
 int
-sparc64_syscall_exit(struct trussinfo *trussinfo, int syscall) {
+sparc64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) {
   char buf[32];
   struct reg regs;
   int retval;
@@ -302,8 +306,8 @@ sparc64_syscall_exit(struct trussinfo *trussinfo, int syscall) {
     sprintf(buf, "/proc/%d/regs", trussinfo->pid);
     fd = open(buf, O_RDONLY);
     if (fd == -1) {
-      fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
-      return;
+      fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
+      return (-1);
     }
     cpid = trussinfo->pid;
   }
@@ -311,7 +315,7 @@ sparc64_syscall_exit(struct trussinfo *trussinfo, int syscall) {
   lseek(fd, 0L, 0);
   if (read(fd, &regs, sizeof(regs)) != sizeof(regs)) {
     fprintf(trussinfo->outfile, "\n");
-    return;
+    return (-1);
   }
   retval = regs.r_out[0];
   errorp = !!(regs.r_tstate & TSTATE_XCC_C);