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diff --git a/lib/libsys/_libsys.h b/lib/libsys/_libsys.h
--- a/lib/libsys/_libsys.h
+++ b/lib/libsys/_libsys.h
@@ -141,8 +141,8 @@
typedef int (__sys_gettimeofday_t)(struct timeval *, struct timezone *);
typedef int (__sys_getrusage_t)(int, struct rusage *);
typedef int (__sys_getsockopt_t)(int, int, int, void *, __socklen_t *);
-typedef int (__sys_readv_t)(int, const struct iovec *, u_int);
-typedef int (__sys_writev_t)(int, const struct iovec *, u_int);
+typedef ssize_t (__sys_readv_t)(int, const struct iovec *, u_int);
+typedef ssize_t (__sys_writev_t)(int, const struct iovec *, u_int);
typedef int (__sys_settimeofday_t)(const struct timeval *, const struct timezone *);
typedef int (__sys_fchown_t)(int, int, int);
typedef int (__sys_fchmod_t)(int, mode_t);
@@ -540,8 +540,8 @@
int __sys_gettimeofday(struct timeval * tp, struct timezone * tzp);
int __sys_getrusage(int who, struct rusage * rusage);
int __sys_getsockopt(int s, int level, int name, void * val, __socklen_t * avalsize);
-int __sys_readv(int fd, const struct iovec * iovp, u_int iovcnt);
-int __sys_writev(int fd, const struct iovec * iovp, u_int iovcnt);
+ssize_t __sys_readv(int fd, const struct iovec * iovp, u_int iovcnt);
+ssize_t __sys_writev(int fd, const struct iovec * iovp, u_int iovcnt);
int __sys_settimeofday(const struct timeval * tv, const struct timezone * tzp);
int __sys_fchown(int fd, int uid, int gid);
int __sys_fchmod(int fd, mode_t mode);
diff --git a/sys/compat/freebsd32/freebsd32_systrace_args.c b/sys/compat/freebsd32/freebsd32_systrace_args.c
--- a/sys/compat/freebsd32/freebsd32_systrace_args.c
+++ b/sys/compat/freebsd32/freebsd32_systrace_args.c
@@ -9473,12 +9473,12 @@
/* freebsd32_readv */
case 120:
if (ndx == 0 || ndx == 1)
- p = "int";
+ p = "ssize_t";
break;
/* freebsd32_writev */
case 121:
if (ndx == 0 || ndx == 1)
- p = "int";
+ p = "ssize_t";
break;
/* freebsd32_settimeofday */
case 122:
diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
--- a/sys/kern/syscalls.master
+++ b/sys/kern/syscalls.master
@@ -782,14 +782,14 @@
}
119 AUE_NULL RESERVED
120 AUE_READV STD|CAPENABLED {
- int readv(
+ ssize_t readv(
int fd,
_In_reads_(iovcnt) _Contains_long_ptr_ const struct iovec *iovp,
u_int iovcnt
);
}
121 AUE_WRITEV STD|CAPENABLED {
- int writev(
+ ssize_t writev(
int fd,
_In_reads_(iovcnt) _Contains_long_ptr_ const struct iovec *iovp,
u_int iovcnt
diff --git a/sys/kern/systrace_args.c b/sys/kern/systrace_args.c
--- a/sys/kern/systrace_args.c
+++ b/sys/kern/systrace_args.c
@@ -9618,12 +9618,12 @@
/* readv */
case 120:
if (ndx == 0 || ndx == 1)
- p = "int";
+ p = "ssize_t";
break;
/* writev */
case 121:
if (ndx == 0 || ndx == 1)
- p = "int";
+ p = "ssize_t";
break;
/* settimeofday */
case 122:

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