diff --git a/lib/libc/compat-43/setruid.3 b/lib/libc/compat-43/setruid.3
index b90656b2b2a9..465d81ed5a15 100644
--- a/lib/libc/compat-43/setruid.3
+++ b/lib/libc/compat-43/setruid.3
@@ -55,13 +55,15 @@ function
 sets the real user ID (group ID) of the
 current process.
 .Sh RETURN VALUES
-Upon success, these functions return 0;
-otherwise \-1 is returned.
-.Pp
-If the user is not the super user, or the uid
-specified is not the real or effective ID, these
-functions return \-1.
-.Pp
+.Rv -std
+.Sh ERRORS
+The functions fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The user is not the super user and the ID
+specified is not the real or effective ID.
+.El
+.Sh COMPATIBILITY
 The use of these calls is not portable.
 Their use is discouraged; they will be removed in the future.
 .Sh SEE ALSO
diff --git a/lib/libc/gen/getdomainname.3 b/lib/libc/gen/getdomainname.3
index 4d6f72376655..69d1b6737ac6 100644
--- a/lib/libc/gen/getdomainname.3
+++ b/lib/libc/gen/getdomainname.3
@@ -67,10 +67,7 @@ which has length
 This call is restricted to the super-user and
 is normally used only when the system is bootstrapped.
 .Sh RETURN VALUES
-If the call succeeds a value of 0 is returned.  If the call
-fails, a value of -1 is returned and an error code is
-placed in the global location
-.Va errno .
+.Rv -std
 .Sh ERRORS
 The following errors may be returned by these calls:
 .Bl -tag -width Er
diff --git a/lib/libc/gen/gethostname.3 b/lib/libc/gen/gethostname.3
index 605ccc78a275..76819b16eed5 100644
--- a/lib/libc/gen/gethostname.3
+++ b/lib/libc/gen/gethostname.3
@@ -67,10 +67,7 @@ which has length
 This call is restricted to the super-user and
 is normally used only when the system is bootstrapped.
 .Sh RETURN VALUES
-If the call succeeds a value of 0 is returned.  If the call
-fails, a value of -1 is returned and an error code is
-placed in the global location
-.Va errno .
+.Rv -std
 .Sh ERRORS
 The following errors may be returned by these calls:
 .Bl -tag -width Er
diff --git a/lib/libc/gen/sem_wait.3 b/lib/libc/gen/sem_wait.3
index 61a21be84aed..d015b909ca84 100644
--- a/lib/libc/gen/sem_wait.3
+++ b/lib/libc/gen/sem_wait.3
@@ -57,14 +57,7 @@ function decrements (locks) the semaphore pointed to by
 only if the value is non-zero.  Otherwise, the semaphore is not decremented and
 an error is returned.
 .Sh RETURN VALUES
-If successful,
-.Fn sem_wait
-and
-.Fn sem_trywait
-return 0.  Otherwise, -1 is returned and
-.Va errno
-is set to indicate the type of
-error.
+.Rv -std
 .Sh ERRORS
 .Fn sem_wait
 and
diff --git a/lib/libc/gen/sysctl.3 b/lib/libc/gen/sysctl.3
index 062f60d40ace..9551466b7b49 100644
--- a/lib/libc/gen/sysctl.3
+++ b/lib/libc/gen/sysctl.3
@@ -753,13 +753,7 @@ If the amount of free and cache memory falls below this value, the
 pageout daemon will enter "memory conserving mode" to avoid deadlock.
 .El
 .Sh RETURN VALUES
-.Fn sysctl
-and
-.Fn sysctlbyname
-return 0 when successful.
-Otherwise \-1 is returned and
-.Va errno
-is set appropriately.
+.Rv -std
 .Sh ERRORS
 The following errors may be reported:
 .Bl -tag -width Er
diff --git a/lib/libc/i386/sys/i386_get_ioperm.2 b/lib/libc/i386/sys/i386_get_ioperm.2
index 11437dca1396..fcd1353bc562 100644
--- a/lib/libc/i386/sys/i386_get_ioperm.2
+++ b/lib/libc/i386/sys/i386_get_ioperm.2
@@ -57,15 +57,7 @@ arguments to the state specified by the
 .Fa enable
 argument.
 .Sh RETURN VALUES
-Upon successful completion,
-.Fn i386_get_ioperm
-and
-.Fn i386_set_ioperm
-return the value of 0.
-Otherwise, a value of -1 is returned and the global
-variable
-.Va errno
-is set to indicate the error.
+.Rv -std
 .Sh ERRORS
 .Fn i386_get_ioperm
 and
diff --git a/lib/libc/net/getifaddrs.3 b/lib/libc/net/getifaddrs.3
index 8f6c58232549..5572ceafdb06 100644
--- a/lib/libc/net/getifaddrs.3
+++ b/lib/libc/net/getifaddrs.3
@@ -129,10 +129,7 @@ is dynamically allocated and should be freed using
 .Fn freeifaddrs
 when no longer needed.
 .Sh RETURN VALUES
-Upon successful completion, a value of 0 is returned.
-Otherwise, a value of -1 is returned and
-.Va errno
-is set to indicate the error.
+.Rv -std getifaddrs
 .Sh ERRORS
 The
 .Fn getifaddrs
diff --git a/lib/libc/posix1e/acl_delete.3 b/lib/libc/posix1e/acl_delete.3
index 2b21bf9a9f0d..8e9cea5bf4b5 100644
--- a/lib/libc/posix1e/acl_delete.3
+++ b/lib/libc/posix1e/acl_delete.3
@@ -61,10 +61,7 @@ name, or by file descriptor.
 support for POSIX.1e interfaces and features is still under
 development at this time.
 .Sh RETURN VALUES
-In the event of success, 0 is returned.  In the event of failure, -1 is
-returned, and
-.Va errno
-is set to indicate the error.
+.Rv -std
 .Sh ERRORS
 If any of the following conditions occur, these functions shall return -1
 and set
diff --git a/lib/libc/posix1e/acl_set.3 b/lib/libc/posix1e/acl_set.3
index 17a8db0683f9..08f2dbd2a0da 100644
--- a/lib/libc/posix1e/acl_set.3
+++ b/lib/libc/posix1e/acl_set.3
@@ -67,10 +67,7 @@ allows the setting of ACLs of any type.
 support for POSIX.1e interfaces and features is still under
 development at this time.
 .Sh RETURN VALUES
-Upon successful completion, the function shall return a value of zero.
-Otherwise, a value of -1 shall be returned and
-.Va errno
-shall be set to indicate the error.
+.Rv -std
 .Sh ERRORS
 If any of the following conditions occur, these functions shall return
 -1 and set
diff --git a/lib/libc/posix1e/acl_valid.3 b/lib/libc/posix1e/acl_valid.3
index a395df6dce3c..9dbdcac72650 100644
--- a/lib/libc/posix1e/acl_valid.3
+++ b/lib/libc/posix1e/acl_valid.3
@@ -84,10 +84,7 @@ non-portable validation functions will not.
 support for POSIX.1e interfaces and features is still under
 development at this time.
 .Sh RETURN VALUES
-Upon successful completion, the function shall return a value of zero.
-Otherwise, a value of -1 shall be returned and
-.Va errno
-shall be set to indicate the error.
+.Rv -std
 .Sh ERRORS
 If any of the following conditions occur, these functions shall return
 -1 and set
diff --git a/lib/libc/stdio/fseek.3 b/lib/libc/stdio/fseek.3
index 73a79f20158d..57e810a2d311 100644
--- a/lib/libc/stdio/fseek.3
+++ b/lib/libc/stdio/fseek.3
@@ -167,14 +167,10 @@ The
 .Fn rewind
 function
 returns no value.
+.Pp
+.Rv -std fgetpos fseek fseeko fsetpos
+.Pp
 Upon successful completion,
-.Fn fgetpos ,
-.Fn fseek ,
-.Fn fseeko ,
-and
-.Fn fsetpos
-return 0,
-and
 .Fn ftell
 and
 .Fn ftello
diff --git a/lib/libc/stdlib/getenv.3 b/lib/libc/stdlib/getenv.3
index a0feb2bf60c3..7f73af761cf0 100644
--- a/lib/libc/stdlib/getenv.3
+++ b/lib/libc/stdlib/getenv.3
@@ -114,14 +114,7 @@ deletes all instances of the variable name pointed to by
 .Fa name
 from the list.
 .Sh RETURN VALUES
-The functions
-.Fn setenv
-and
-.Fn putenv
-return zero if successful; otherwise the global variable
-.Va errno
-is set to indicate the error and a
-\-1 is returned.
+.Rv -std setenv putenv
 .Sh ERRORS
 .Bl -tag -width Er
 .It Bq Er ENOMEM
diff --git a/lib/libc/stdlib/qsort.3 b/lib/libc/stdlib/qsort.3
index da4df561f565..cc62a8c71635 100644
--- a/lib/libc/stdlib/qsort.3
+++ b/lib/libc/stdlib/qsort.3
@@ -154,14 +154,7 @@ The
 function
 returns no value.
 .Pp
-Upon successful completion,
-.Fn heapsort
-and
-.Fn mergesort
-return 0.
-Otherwise, they return \-1 and the global variable
-.Va errno
-is set to indicate the error.
+.Rv -std heapsort mergesort
 .Sh ERRORS
 The
 .Fn heapsort
diff --git a/lib/libc/sys/brk.2 b/lib/libc/sys/brk.2
index 50c819635c6a..72e3c479a7cb 100644
--- a/lib/libc/sys/brk.2
+++ b/lib/libc/sys/brk.2
@@ -105,17 +105,14 @@ e.g.\&
 for the definition of
 .Va etext ) .
 .Sh RETURN VALUES
-.Fn Brk
-returns 0 if successful;
-otherwise -1 with
-.Va errno
-set to indicate why the allocation failed.
+.Rv -std brk
+.Pp
 The
 .Fn sbrk
 function returns a pointer to the base of the new storage if successful;
-otherwise -1 with
+otherwise the value \-1 is returned and the global variable
 .Va errno
-set to indicate why the allocation failed.
+is set to indicate the error.
 .Sh ERRORS
 .Fn Brk
 or
diff --git a/lib/libc/sys/chdir.2 b/lib/libc/sys/chdir.2
index bd969f9c0ead..864878985a4b 100644
--- a/lib/libc/sys/chdir.2
+++ b/lib/libc/sys/chdir.2
@@ -73,11 +73,7 @@ a slash,
 In order for a directory to become the current directory,
 a process must have execute (search) access to the directory.
 .Sh RETURN VALUES
-Upon successful completion, a value of 0 is returned.
-Otherwise, a value of -1 is returned and
-.Va errno
-is set to indicate
-the error.
+.Rv -std
 .Sh ERRORS
 .Fn Chdir
 will fail and the current working directory will be unchanged if
diff --git a/lib/libc/sys/chflags.2 b/lib/libc/sys/chflags.2
index 632e359df026..05205c625b46 100644
--- a/lib/libc/sys/chflags.2
+++ b/lib/libc/sys/chflags.2
@@ -106,10 +106,7 @@ the system is in single-user mode.
 .Xr init 8
 for details.)
 .Sh RETURN VALUES
-Upon successful completion, a value of 0 is returned.
-Otherwise, -1 is returned and the global variable
-.Va errno
-is set to indicate the error.
+.Rv -std
 .Sh ERRORS
 .Fn Chflags
 will fail if:
diff --git a/lib/libc/sys/chmod.2 b/lib/libc/sys/chmod.2
index d003503f1593..5a165ca709af 100644
--- a/lib/libc/sys/chmod.2
+++ b/lib/libc/sys/chmod.2
@@ -157,10 +157,7 @@ by protecting set-user-id (set-group-id) files
 from remaining set-user-id (set-group-id) if they are modified,
 at the expense of a degree of compatibility.
 .Sh RETURN VALUES
-Upon successful completion, a value of 0 is returned.
-Otherwise, a value of -1 is returned and
-.Va errno
-is set to indicate the error.
+.Rv -std
 .Sh ERRORS
 .Fn Chmod
 will fail and the file mode will be unchanged if:
diff --git a/lib/libc/sys/chown.2 b/lib/libc/sys/chown.2
index 363893ac784a..65fd888f9228 100644
--- a/lib/libc/sys/chown.2
+++ b/lib/libc/sys/chown.2
@@ -91,10 +91,7 @@ but does not follow symbolic links.
 One of the owner or group id's
 may be left unchanged by specifying it as -1.
 .Sh RETURN VALUES
-Zero is returned if the operation was successful;
--1 is returned if an error occurs, with a more specific
-error code being placed in the global variable
-.Va errno .
+.Rv -std
 .Sh ERRORS
 .Fn Chown
 and
diff --git a/lib/libc/sys/clock_gettime.2 b/lib/libc/sys/clock_gettime.2
index 57375608e2f1..633f3f9a64bc 100644
--- a/lib/libc/sys/clock_gettime.2
+++ b/lib/libc/sys/clock_gettime.2
@@ -94,10 +94,7 @@ The resolution (granularity) of a clock is returned by the
 call.  This value is placed in a (non-NULL)
 .Fa *tp .
 .Sh RETURN VALUES
-A 0 return value indicates that the call succeeded.
-A -1 return value indicates an error occurred, and in this
-case an error code is stored into the global variable
-.Va errno .
+.Rv -std
 .Sh ERRORS
 The following error codes may be set in
 .Va errno :
diff --git a/lib/libc/sys/extattr_get_file.2 b/lib/libc/sys/extattr_get_file.2
index f22271a154f4..bb4400459f82 100644
--- a/lib/libc/sys/extattr_get_file.2
+++ b/lib/libc/sys/extattr_get_file.2
@@ -131,13 +131,12 @@ calls return the number of bytes
 that were read or written from the
 .Fa iovp ,
 respectively.
-The
-.Fn extattr_delete_file
-call returns 0 on success.
 If any of the calls are unsuccessful, the value \-1 is returned
 and the global variable
 .Va errno
 is set to indicate the error.
+.Pp
+.Rv -std extattr_delete_file
 .Sh ERRORS
 The following errors may be returned by the system calls themselves.
 Additionally, the filesystem implementing the call may return any
diff --git a/lib/libc/sys/fhopen.2 b/lib/libc/sys/fhopen.2
index 6deb16a057e8..270be1cd3ea1 100644
--- a/lib/libc/sys/fhopen.2
+++ b/lib/libc/sys/fhopen.2
@@ -87,14 +87,12 @@ rather than an open file.
 .Sh RETURN VALUES
 Upon successful completion,
 .Fn fhopen
-returns the file descriptor for the opened file, while
-.Fn fhstat
-and
-.Fn fhstatfs
-return 0.
-Otherwise, -1 is returned and
+returns the file descriptor for the opened file;
+otherwise the value \-1 is returned and the global variable
 .Va errno
 is set to indicate the error.
+.Pp
+.Rv -std fhstat fhstatfs
 .Sh ERRORS
 In addition to the errors returned by
 .Xr open 2 ,
diff --git a/lib/libc/sys/getitimer.2 b/lib/libc/sys/getitimer.2
index 156caa1cc558..e99e9a863b83 100644
--- a/lib/libc/sys/getitimer.2
+++ b/lib/libc/sys/getitimer.2
@@ -147,10 +147,7 @@ tests if a time value is non-zero, and
 .Fa timercmp
 compares two time values.
 .Sh RETURN VALUES
-If the calls succeed, a value of 0 is returned.  If an error occurs,
-the value -1 is returned, and a more precise error code is placed
-in the global variable
-.Va errno .
+.Rv -std
 .Sh ERRORS
 .Fn Getitimer
 and
diff --git a/lib/libc/sys/getlogin.2 b/lib/libc/sys/getlogin.2
index 89c9211cea8c..07e54f65a413 100644
--- a/lib/libc/sys/getlogin.2
+++ b/lib/libc/sys/getlogin.2
@@ -139,13 +139,7 @@ if the name has not been set.
 .Fn getlogin_r
 returns zero if successful, or the error number upon failure.
 .Pp
-If a call to
-.Fn setlogin
-succeeds, a value of 0 is returned.  If
-.Fn setlogin
-fails, a value of -1 is returned and an error code is
-placed in the global location
-.Va errno .
+.Rv -std setlogin
 .Sh ERRORS
 The following errors may be returned by these calls:
 .Bl -tag -width Er
diff --git a/lib/libc/sys/getpriority.2 b/lib/libc/sys/getpriority.2
index efaa5ed826a2..d156702110fb 100644
--- a/lib/libc/sys/getpriority.2
+++ b/lib/libc/sys/getpriority.2
@@ -99,10 +99,8 @@ to clear the external variable
 prior to the
 call, then check it afterward to determine
 if a -1 is an error or a legitimate value.
-The
-.Fn setpriority
-call returns 0 if there is no error, or
--1 if there is.
+.Pp
+.Rv -std setpriority
 .Sh ERRORS
 .Fn Getpriority
 and
diff --git a/lib/libc/sys/getrlimit.2 b/lib/libc/sys/getrlimit.2
index 9b762145e380..d573fbc25b6e 100644
--- a/lib/libc/sys/getrlimit.2
+++ b/lib/libc/sys/getrlimit.2
@@ -155,11 +155,7 @@ the soft cpu time limit is exceeded, a signal
 is sent to the
 offending process.
 .Sh RETURN VALUES
-A 0 return value indicates that the call succeeded, changing
-or returning the resource limit.   A return value of -1 indicates
-that an error occurred, and an error code is stored in the global
-location
-.Va errno .
+.Rv -std
 .Sh ERRORS
 .Fn Getrlimit
 and
diff --git a/lib/libc/sys/getsockopt.2 b/lib/libc/sys/getsockopt.2
index b5bc37ba7d36..c61691e2038b 100644
--- a/lib/libc/sys/getsockopt.2
+++ b/lib/libc/sys/getsockopt.2
@@ -391,7 +391,7 @@ Before returning,
 unlocks
 .Fa s .
 .Sh RETURN VALUES
-A 0 is returned if the call succeeds, -1 if it fails.
+.Rv -std
 .Sh ERRORS
 The call succeeds unless:
 .Bl -tag -width Er
diff --git a/lib/libc/sys/gettimeofday.2 b/lib/libc/sys/gettimeofday.2
index 06b7996b5179..a0cb09687b71 100644
--- a/lib/libc/sys/gettimeofday.2
+++ b/lib/libc/sys/gettimeofday.2
@@ -108,10 +108,7 @@ The system time can still be adjusted backwards using the
 .Xr adjtime 2
 system call even when the system is secure.
 .Sh RETURN VALUES
-A 0 return value indicates that the call succeeded.
-A -1 return value indicates an error occurred, and in this
-case an error code is stored into the global variable
-.Va errno .
+.Rv -std
 .Sh ERRORS
 The following error codes may be set in
 .Va errno :
diff --git a/lib/libc/sys/mlock.2 b/lib/libc/sys/mlock.2
index ba2bbb1976d5..fd92aa2830c6 100644
--- a/lib/libc/sys/mlock.2
+++ b/lib/libc/sys/mlock.2
@@ -106,13 +106,10 @@ resource limit.
 .Pp
 These calls are only available to the super-user.
 .Sh RETURN VALUES
-A return value of 0 indicates that the call
-succeeded and all pages in the range have either been locked or unlocked.
-A return value of -1 indicates an error occurred and the locked
-status of all pages in the range remains unchanged.
-In this case, the global location
-.Va errno
-is set to indicate the error.
+.Rv -std
+.Pp
+If the call succeeds, all pages in the range become locked (unlocked);
+otherwise the locked status of all pages in the range remains unchanged.
 .Sh ERRORS
 .Fn Mlock
 will fail if:
diff --git a/lib/libc/sys/mount.2 b/lib/libc/sys/mount.2
index ef3d22de58f4..d8f8decc295c 100644
--- a/lib/libc/sys/mount.2
+++ b/lib/libc/sys/mount.2
@@ -169,19 +169,7 @@ and
 .Xr chmod 2
 pages for more information.
 .Sh RETURN VALUES
-The
-.Fn mount
-returns the value 0 if the mount was successful, otherwise -1 is returned
-and the variable
-.Va errno
-is set to indicate the error.
-.Pp
-The
-.Fn unmount
-function returns the value 0 if the umount succeeded; otherwise -1 is returned
-and the variable
-.Va errno
-is set to indicate the error.
+.Rv -std
 .Sh ERRORS
 The
 .Fn mount
diff --git a/lib/libc/sys/rtprio.2 b/lib/libc/sys/rtprio.2
index bfd72c446e23..f5175adb16b8 100644
--- a/lib/libc/sys/rtprio.2
+++ b/lib/libc/sys/rtprio.2
@@ -82,11 +82,7 @@ Higher real/idle priority processes
 preempt lower real/idle priority processes.
 Processes of equal real/idle priority are run round-robin.
 .Sh RETURN VALUES
-.Fn rtprio
-will return 0 for success and -1 for all errors.
-The global variable
-.Va errno
-will be set to indicate the error.
+.Rv -std rtprio
 .Sh ERRORS
 .Fn rtprio
 will fail if
diff --git a/lib/libc/sys/sched_get_priority_max.2 b/lib/libc/sys/sched_get_priority_max.2
index 54095d0e78b7..82b8685ee1fe 100644
--- a/lib/libc/sys/sched_get_priority_max.2
+++ b/lib/libc/sys/sched_get_priority_max.2
@@ -85,12 +85,7 @@ respectively.  If unsuccessful, they shall return a value of -1 and set
 .Fa errno
 to indicate the error.
 .Pp
-If successful, the
-.Fn sched_rr_get_interval
-function will return 0.  Otherwise, it will
-return a value of -1 and set
-.Fa errno
-to indicate the error.
+.Rv -std sched_rr_get_interval
 .Sh ERRORS
 On failure
 .Va errno
diff --git a/lib/libc/sys/sched_setparam.2 b/lib/libc/sys/sched_setparam.2
index 57b077f5ec19..ac9be7661548 100644
--- a/lib/libc/sys/sched_setparam.2
+++ b/lib/libc/sys/sched_setparam.2
@@ -134,10 +134,7 @@ function will fail if
 .Fa pid
 is negative.
 .Sh RETURN VALUES
-The function will return zero if it completes successfully, or it
-will return a value of -1 and set
-.Va errno
-to indicate the error.
+.Rv -std
 .Sh ERRORS
 On failure
 .Va errno
diff --git a/lib/libc/sys/sched_setscheduler.2 b/lib/libc/sys/sched_setscheduler.2
index b616e6dede16..556b9863c345 100644
--- a/lib/libc/sys/sched_setscheduler.2
+++ b/lib/libc/sys/sched_setscheduler.2
@@ -129,10 +129,7 @@ function will fail if
 .Fa pid
 is negative.
 .Sh RETURN VALUES
-The function will return zero if it completes successfully, or it
-will return a value of -1 and set
-.Va errno
-to indicate the error.
+.Rv -std
 .Sh ERRORS
 On failure
 .Va errno
diff --git a/lib/libc/sys/setpgid.2 b/lib/libc/sys/setpgid.2
index d9178b597b84..30667d67ee71 100644
--- a/lib/libc/sys/setpgid.2
+++ b/lib/libc/sys/setpgid.2
@@ -61,11 +61,7 @@ If the invoker is not the super-user, then the affected process
 must have the same effective user-id as the invoker or be a descendant
 of the invoking process.
 .Sh RETURN VALUES
-.Fn Setpgid
-returns 0 when the operation was successful.
-If the request failed, -1 is returned and the global variable
-.Va errno
-indicates the reason.
+.Rv -std setpgid
 .Sh ERRORS
 .Fn Setpgid
 will fail and the process group will not be altered if:
diff --git a/lib/libc/sys/setresuid.2 b/lib/libc/sys/setresuid.2
index 37b44ab4a10e..d1a3b28613bb 100644
--- a/lib/libc/sys/setresuid.2
+++ b/lib/libc/sys/setresuid.2
@@ -65,11 +65,7 @@ and
 calls retrieve the real, effective, and saved group and user IDs of
 the current process, respectively.
 .Sh RETURN VALUES
-These functions return the value 0 if successful;
-otherwise the value -1 is returned
-and the global variable
-.Va errno
-is set to indicate the error.
+.Rv -std
 .Sh ERRORS
 .Bl -tag -width Er
 .It Bq Er EPERM
diff --git a/lib/libc/sys/setuid.2 b/lib/libc/sys/setuid.2
index 4ef4d35eee7d..3403b108556d 100644
--- a/lib/libc/sys/setuid.2
+++ b/lib/libc/sys/setuid.2
@@ -120,12 +120,14 @@ by reverting to the set-user-ID value.
 Similarly, the effective group ID may be set to the value
 of the real group ID or the saved set-user-ID.
 .Sh RETURN VALUES
-Upon success, these functions return 0;
-otherwise \-1 is returned.
-.Pp
-If the user is not the super user, or the uid
-specified is not the real, effective ID, or saved ID,
-these functions return \-1.
+.Rv -std
+.Sh ERRORS
+The functions will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The user is not the super user and the ID
+specified is not the real, effective ID, or saved ID.
+.El
 .Sh SEE ALSO
 .Xr getgid 2 ,
 .Xr getuid 2 ,
diff --git a/lib/libc/sys/shmat.2 b/lib/libc/sys/shmat.2
index 6f7dc13eba75..63a08bcd9c67 100644
--- a/lib/libc/sys/shmat.2
+++ b/lib/libc/sys/shmat.2
@@ -85,11 +85,7 @@ is returned and
 .Va errno
 is set to indicate the error.
 .Pp
-Upon success,
-.Fn shmdt
-returns 0; otherwise, -1 is returned and
-.Va errno
-is set to indicate the error.
+.Rv -std shmdt
 .Sh ERRORS
 .Fn Shmat
 will fail if:
diff --git a/lib/libc/sys/stat.2 b/lib/libc/sys/stat.2
index 9984a1ef1f43..50499f73aff2 100644
--- a/lib/libc/sys/stat.2
+++ b/lib/libc/sys/stat.2
@@ -200,10 +200,7 @@ For a list of access modes, see
 and
 .Xr chmod 2 .
 .Sh RETURN VALUES
-Upon successful completion a value of 0 is returned.
-Otherwise, a value of -1 is returned and
-.Va errno
-is set to indicate the error.
+.Rv -std
 .Sh COMPATIBILITY
 Previous versions of the system used different types for the
 .Li st_dev ,
diff --git a/lib/libc/sys/statfs.2 b/lib/libc/sys/statfs.2
index 7119d2565797..17e8ebe6d08e 100644
--- a/lib/libc/sys/statfs.2
+++ b/lib/libc/sys/statfs.2
@@ -125,10 +125,7 @@ Fields that are undefined for a particular file system are set to -1.
 returns the same information about an open file referenced by descriptor
 .Fa fd .
 .Sh RETURN VALUES
-Upon successful completion, a value of 0 is returned.
-Otherwise, -1 is returned and the global variable
-.Va errno
-is set to indicate the error.
+.Rv -std
 .Sh ERRORS
 .Fn Statfs
 fails if one or more of the following are true:
diff --git a/lib/libc/sys/truncate.2 b/lib/libc/sys/truncate.2
index fb3311f494fa..aa6a4b60d071 100644
--- a/lib/libc/sys/truncate.2
+++ b/lib/libc/sys/truncate.2
@@ -65,10 +65,7 @@ With
 .Fn ftruncate ,
 the file must be open for writing.
 .Sh RETURN VALUES
-A value of 0 is returned if the call succeeds.  If the call
-fails a -1 is returned, and the global variable
-.Va errno
-specifies the error.
+.Rv -std
 .Sh ERRORS
 .Fn Truncate
 succeeds unless:
diff --git a/lib/libc/sys/utimes.2 b/lib/libc/sys/utimes.2
index 84a0a0dbd20e..1b2ef22aff43 100644
--- a/lib/libc/sys/utimes.2
+++ b/lib/libc/sys/utimes.2
@@ -91,10 +91,7 @@ while
 .Fn utimes
 changes the times of the file the link references.
 .Sh RETURN VALUES
-Upon successful completion, a value of 0 is returned.
-Otherwise, a value of -1 is returned and
-.Va errno
-is set to indicate the error.
+.Rv -std
 .Sh ERRORS
 .Fn utimes
 and
diff --git a/lib/libc_r/man/sem_wait.3 b/lib/libc_r/man/sem_wait.3
index 61a21be84aed..d015b909ca84 100644
--- a/lib/libc_r/man/sem_wait.3
+++ b/lib/libc_r/man/sem_wait.3
@@ -57,14 +57,7 @@ function decrements (locks) the semaphore pointed to by
 only if the value is non-zero.  Otherwise, the semaphore is not decremented and
 an error is returned.
 .Sh RETURN VALUES
-If successful,
-.Fn sem_wait
-and
-.Fn sem_trywait
-return 0.  Otherwise, -1 is returned and
-.Va errno
-is set to indicate the type of
-error.
+.Rv -std
 .Sh ERRORS
 .Fn sem_wait
 and
diff --git a/lib/libpthread/man/sem_wait.3 b/lib/libpthread/man/sem_wait.3
index 61a21be84aed..d015b909ca84 100644
--- a/lib/libpthread/man/sem_wait.3
+++ b/lib/libpthread/man/sem_wait.3
@@ -57,14 +57,7 @@ function decrements (locks) the semaphore pointed to by
 only if the value is non-zero.  Otherwise, the semaphore is not decremented and
 an error is returned.
 .Sh RETURN VALUES
-If successful,
-.Fn sem_wait
-and
-.Fn sem_trywait
-return 0.  Otherwise, -1 is returned and
-.Va errno
-is set to indicate the type of
-error.
+.Rv -std
 .Sh ERRORS
 .Fn sem_wait
 and