Update libcalls.go

Update libcalls.go to decrease the number of stubs needed. This patch
removes wrappers for system calls that are not used from libgo and
that are not yet implemented on Unikraft.

Signed-off-by: Charalampos Mainas <Charalampos.Mainas@neclab.eu>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

diff --git a/generated/libcalls.go b/generated/libcalls.go
index 5565641b0c4eca30fa0b36833193a7aba2828980..012fedcbf1c89f6aaf3232666ce03c35669c14c8 100644 (file)
--- a/generated/libcalls.go
+++ b/generated/libcalls.go
@@ -426,49 +426,6 @@ func accept4(fd int, sa *RawSockaddrAny, len *Socklen_t, flags int) (nfd int, er
        return
 }
 
-// Automatically generated wrapper for Acct/acct
-//extern acct
-func c_acct(path *byte) _C_int
-func Acct(path string) (err error) {
-       var _p1 *byte
-       _p1, err = BytePtrFromString(path)
-       if err != nil {
-               return
-       }
-       Entersyscall()
-       _r := c_acct(_p1)
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
-// Automatically generated wrapper for Adjtimex/adjtimex
-//extern adjtimex
-func c_adjtimex(buf *Timex) _C_int
-func Adjtimex(buf *Timex) (state int, err error) {
-       Entersyscall()
-       _r := c_adjtimex(buf)
-       state = (int)(_r)
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
 
 // Automatically generated wrapper for Dup3/dup3
 //extern dup3
@@ -731,31 +688,6 @@ func InotifyRmWatch(fd int, watchdesc uint32) (success int, err error) {
        return
 }
 
-// Automatically generated wrapper for Klogctl/klogctl
-//extern klogctl
-func c_klogctl(typ _C_int, bufp *byte, len _C_int) _C_int
-func Klogctl(typ int, buf []byte) (n int, err error) {
-       var _p2 *byte
-       if len(buf) > 0 {
-               _p2 = (*byte)(unsafe.Pointer(&buf[0]))
-       } else {
-               _p2 = (*byte)(unsafe.Pointer(&_zero))
-       }
-       Entersyscall()
-       _r := c_klogctl(_C_int(typ), _p2, _C_int(len(buf)))
-       n = (int)(_r)
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
 
 // Automatically generated wrapper for Listxattr/listxattr
 //extern listxattr
@@ -853,34 +785,6 @@ func pipe2(p *[2]_C_int, flags int) (err error) {
        return
 }
 
-// Automatically generated wrapper for PivotRoot/pivot_root
-//extern pivot_root
-func c_pivot_root(newroot *byte, putold *byte) _C_int
-func PivotRoot(newroot string, putold string) (err error) {
-       var _p1 *byte
-       _p1, err = BytePtrFromString(newroot)
-       if err != nil {
-               return
-       }
-       var _p2 *byte
-       _p2, err = BytePtrFromString(putold)
-       if err != nil {
-               return
-       }
-       Entersyscall()
-       _r := c_pivot_root(_p1, _p2)
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
 
 // Automatically generated wrapper for Removexattr/removexattr
 //extern removexattr
@@ -960,61 +864,6 @@ func sendfile(outfd int, infd int, offset *Offset_t, count int) (written int, er
        return
 }
 
-// Automatically generated wrapper for Setfsgid/setfsgid
-//extern setfsgid
-func c_setfsgid(gid Gid_t) _C_int
-func Setfsgid(gid int) (err error) {
-       Entersyscall()
-       _r := c_setfsgid(Gid_t(gid))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
-// Automatically generated wrapper for Setfsuid/setfsuid
-//extern setfsuid
-func c_setfsuid(uid Uid_t) _C_int
-func Setfsuid(uid int) (err error) {
-       Entersyscall()
-       _r := c_setfsuid(Uid_t(uid))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
-// Automatically generated wrapper for Setresgid/setresgid
-//extern setresgid
-func c_setresgid(rgid Gid_t, egid Gid_t, sgid Gid_t) _C_int
-func Setresgid(rgid int, egid int, sgid int) (err error) {
-       _r := c_setresgid(Gid_t(rgid), Gid_t(egid), Gid_t(sgid))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
 // Automatically generated wrapper for Setresuid/setresuid
 //extern setresuid
 func c_setresuid(ruid Uid_t, euid Uid_t, suid Uid_t) _C_int
@@ -1130,23 +979,6 @@ func SyncFileRange(fd int, off int64, n int64, flags int) (err error) {
        return
 }
 
-// Automatically generated wrapper for Sysinfo/sysinfo
-//extern sysinfo
-func c_sysinfo(info *Sysinfo_t) _C_int
-func Sysinfo(info *Sysinfo_t) (err error) {
-       _r := c_sysinfo(info)
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
 // Automatically generated wrapper for Tee/tee
 //extern tee
 func c_tee(rfd _C_int, wfd _C_int, len Size_t, flags _C_uint) Ssize_t
@@ -1234,63 +1066,6 @@ func Unshare(flags int) (err error) {
        return
 }
 
-// Automatically generated wrapper for Ioperm/ioperm
-//extern ioperm
-func c_ioperm(from _C_long, num _C_long, on _C_int) _C_int
-func Ioperm(from int, num int, on int) (err error) {
-       Entersyscall()
-       _r := c_ioperm(_C_long(from), _C_long(num), _C_int(on))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
-// Automatically generated wrapper for Iopl/iopl
-//extern iopl
-func c_iopl(level _C_int) _C_int
-func Iopl(level int) (err error) {
-       Entersyscall()
-       _r := c_iopl(_C_int(level))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
-// Automatically generated wrapper for Ustat/ustat
-//extern ustat
-func c_ustat(dev _dev_t, ubuf *Ustat_t) _C_int
-func Ustat(dev int, ubuf *Ustat_t) (err error) {
-       Entersyscall()
-       _r := c_ustat(_dev_t(dev), ubuf)
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
 // Automatically generated wrapper for utimensat/utimensat
 //extern utimensat
 func c_utimensat(dirfd _C_int, path *byte, times *[2]Timespec, flags _C_int) _C_int
@@ -1408,30 +1183,6 @@ func setgroups(n int, list *Gid_t) (err error) {
        return
 }
 
-// Automatically generated wrapper for Mkfifo/mkfifo
-//extern mkfifo
-func c_mkfifo(path *byte, mode Mode_t) _C_int
-func Mkfifo(path string, mode uint32) (err error) {
-       var _p1 *byte
-       _p1, err = BytePtrFromString(path)
-       if err != nil {
-               return
-       }
-       Entersyscall()
-       _r := c_mkfifo(_p1, Mode_t(mode))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
 // Automatically generated wrapper for Select/select
 //extern select
 func c_select(nfd _C_int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) _C_int
@@ -1852,26 +1603,6 @@ func Getppid() (ppid int) {
        return
 }
 
-// Automatically generated wrapper for Getpriority/getpriority
-//extern getpriority
-func c_getpriority(which _C_int, who _C_int) _C_int
-func Getpriority(which int, who int) (prio int, err error) {
-       Entersyscall()
-       _r := c_getpriority(_C_int(which), _C_int(who))
-       prio = (int)(_r)
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
 // Automatically generated wrapper for Getrusage/getrusage
 //extern getrusage
 func c_getrusage(who _C_int, rusage *Rusage) _C_int
@@ -2236,31 +1967,6 @@ func Rmdir(path string) (err error) {
        return
 }
 
-// Automatically generated wrapper for Setdomainname/setdomainname
-//extern setdomainname
-func c_setdomainname(name *byte, len Size_t) _C_int
-func Setdomainname(p []byte) (err error) {
-       var _p1 *byte
-       if len(p) > 0 {
-               _p1 = (*byte)(unsafe.Pointer(&p[0]))
-       } else {
-               _p1 = (*byte)(unsafe.Pointer(&_zero))
-       }
-       Entersyscall()
-       _r := c_setdomainname(_p1, Size_t(len(p)))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
 // Automatically generated wrapper for Sethostname/sethostname
 //extern sethostname
 func c_sethostname(name *byte, len Size_t) _C_int
@@ -2335,25 +2041,6 @@ func Setpgid(pid int, pgid int) (err error) {
        return
 }
 
-// Automatically generated wrapper for Setpriority/setpriority
-//extern setpriority
-func c_setpriority(which _C_int, who _C_int, prio _C_int) _C_int
-func Setpriority(which int, who int, prio int) (err error) {
-       Entersyscall()
-       _r := c_setpriority(_C_int(which), _C_int(who), _C_int(prio))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
 // Automatically generated wrapper for Setreuid/setreuid
 //extern setreuid
 func c_setreuid(ruid Uid_t, euid Uid_t) _C_int
@@ -2663,94 +2350,6 @@ func Mprotect(b []byte, prot int) (err error) {
        return
 }
 
-// Automatically generated wrapper for Mlock/mlock
-//extern mlock
-func c_mlock(addr *byte, len Size_t) _C_int
-func Mlock(b []byte) (err error) {
-       var _p1 *byte
-       if len(b) > 0 {
-               _p1 = (*byte)(unsafe.Pointer(&b[0]))
-       } else {
-               _p1 = (*byte)(unsafe.Pointer(&_zero))
-       }
-       Entersyscall()
-       _r := c_mlock(_p1, Size_t(len(b)))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
-// Automatically generated wrapper for Munlock/munlock
-//extern munlock
-func c_munlock(addr *byte, len Size_t) _C_int
-func Munlock(b []byte) (err error) {
-       var _p1 *byte
-       if len(b) > 0 {
-               _p1 = (*byte)(unsafe.Pointer(&b[0]))
-       } else {
-               _p1 = (*byte)(unsafe.Pointer(&_zero))
-       }
-       Entersyscall()
-       _r := c_munlock(_p1, Size_t(len(b)))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
-// Automatically generated wrapper for Mlockall/mlockall
-//extern mlockall
-func c_mlockall(flags _C_int) _C_int
-func Mlockall(flags int) (err error) {
-       Entersyscall()
-       _r := c_mlockall(_C_int(flags))
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
-// Automatically generated wrapper for Munlockall/munlockall
-//extern munlockall
-func c_munlockall() _C_int
-func Munlockall() (err error) {
-       Entersyscall()
-       _r := c_munlockall()
-       var errno Errno
-       setErrno := false
-       if _r < 0 {
-               errno = GetErrno()
-               setErrno = true
-       }
-       Exitsyscall()
-       if setErrno {
-               err = errno
-       }
-       return
-}
-
 // Automatically generated wrapper for Tcgetattr/tcgetattr
 //extern tcgetattr
 func c_tcgetattr(fd _C_int, p *Termios) _C_int
@@ -2807,12 +2406,12 @@ func sysconf(name int) (ret int64, err error) {
        return
 }
 
-// Automatically generated wrapper for Fstat/fstat64
-//extern fstat64
-func c_fstat64(fd _C_int, stat *Stat_t) _C_int
+// Automatically generated wrapper for Fstat/fstat
+//extern fstat
+func c_fstat(fd _C_int, stat *Stat_t) _C_int
 func Fstat(fd int, stat *Stat_t) (err error) {
        Entersyscall()
-       _r := c_fstat64(_C_int(fd), stat)
+       _r := c_fstat(_C_int(fd), stat)
        var errno Errno
        setErrno := false
        if _r < 0 {
@@ -2826,12 +2425,12 @@ func Fstat(fd int, stat *Stat_t) (err error) {
        return
 }
 
-// Automatically generated wrapper for Ftruncate/ftruncate64
-//extern ftruncate64
-func c_ftruncate64(fd _C_int, length Offset_t) _C_int
+// Automatically generated wrapper for Ftruncate/ftruncate
+//extern ftruncate
+func c_ftruncate(fd _C_int, length Offset_t) _C_int
 func Ftruncate(fd int, length int64) (err error) {
        Entersyscall()
-       _r := c_ftruncate64(_C_int(fd), Offset_t(length))
+       _r := c_ftruncate(_C_int(fd), Offset_t(length))
        var errno Errno
        setErrno := false
        if _r < 0 {
@@ -2845,11 +2444,11 @@ func Ftruncate(fd int, length int64) (err error) {
        return
 }
 
-// Automatically generated wrapper for Getrlimit/getrlimit64
-//extern getrlimit64
-func c_getrlimit64(resource _C_int, rlim *Rlimit) _C_int
+// Automatically generated wrapper for Getrlimit/getrlimit
+//extern getrlimit
+func c_getrlimit(resource _C_int, rlim *Rlimit) _C_int
 func Getrlimit(resource int, rlim *Rlimit) (err error) {
-       _r := c_getrlimit64(_C_int(resource), rlim)
+       _r := c_getrlimit(_C_int(resource), rlim)
        var errno Errno
        setErrno := false
        if _r < 0 {
@@ -2862,9 +2461,9 @@ func Getrlimit(resource int, rlim *Rlimit) (err error) {
        return
 }
 
-// Automatically generated wrapper for Lstat/lstat64
-//extern lstat64
-func c_lstat64(path *byte, stat *Stat_t) _C_int
+// Automatically generated wrapper for Lstat/lstat
+//extern lstat
+func c_lstat(path *byte, stat *Stat_t) _C_int
 func Lstat(path string, stat *Stat_t) (err error) {
        var _p1 *byte
        _p1, err = BytePtrFromString(path)
@@ -2872,7 +2471,7 @@ func Lstat(path string, stat *Stat_t) (err error) {
                return
        }
        Entersyscall()
-       _r := c_lstat64(_p1, stat)
+       _r := c_lstat(_p1, stat)
        var errno Errno
        setErrno := false
        if _r < 0 {
@@ -2886,12 +2485,12 @@ func Lstat(path string, stat *Stat_t) (err error) {
        return
 }
 
-// Automatically generated wrapper for mmap/mmap64
-//extern mmap64
-func c_mmap64(addr *byte, length Size_t, prot _C_int, flags _C_int, fd _C_int, offset Offset_t) *byte
+// Automatically generated wrapper for mmap/mmap
+//extern mmap
+func c_mmap(addr *byte, length Size_t, prot _C_int, flags _C_int, fd _C_int, offset Offset_t) *byte
 func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
        Entersyscall()
-       _r := c_mmap64((*byte)(unsafe.Pointer(addr)), Size_t(length), _C_int(prot), _C_int(flags), _C_int(fd), Offset_t(offset))
+       _r := c_mmap((*byte)(unsafe.Pointer(addr)), Size_t(length), _C_int(prot), _C_int(flags), _C_int(fd), Offset_t(offset))
        xaddr = (uintptr)(unsafe.Pointer(_r))
        var errno Errno
        setErrno := false
@@ -2906,9 +2505,9 @@ func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int6
        return
 }
 
-// Automatically generated wrapper for Open/__go_open64
-//extern __go_open64
-func c___go_open64(path *byte, mode _C_int, perm Mode_t) _C_int
+// Automatically generated wrapper for Open/__go_open
+//extern __go_open
+func c___go_open(path *byte, mode _C_int, perm Mode_t) _C_int
 func Open(path string, mode int, perm uint32) (fd int, err error) {
        var _p1 *byte
        _p1, err = BytePtrFromString(path)
@@ -2916,7 +2515,7 @@ func Open(path string, mode int, perm uint32) (fd int, err error) {
                return
        }
        Entersyscall()
-       _r := c___go_open64(_p1, _C_int(mode), Mode_t(perm))
+       _r := c___go_open(_p1, _C_int(mode), Mode_t(perm))
        fd = (int)(_r)
        var errno Errno
        setErrno := false
@@ -2931,9 +2530,9 @@ func Open(path string, mode int, perm uint32) (fd int, err error) {
        return
 }
 
-// Automatically generated wrapper for Pread/pread64
-//extern pread64
-func c_pread64(fd _C_int, buf *byte, count Size_t, offset Offset_t) Ssize_t
+// Automatically generated wrapper for Pread/pread
+//extern pread
+func c_pread(fd _C_int, buf *byte, count Size_t, offset Offset_t) Ssize_t
 func Pread(fd int, p []byte, offset int64) (n int, err error) {
        var _p2 *byte
        if len(p) > 0 {
@@ -2942,7 +2541,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
                _p2 = (*byte)(unsafe.Pointer(&_zero))
        }
        Entersyscall()
-       _r := c_pread64(_C_int(fd), _p2, Size_t(len(p)), Offset_t(offset))
+       _r := c_pread(_C_int(fd), _p2, Size_t(len(p)), Offset_t(offset))
        n = (int)(_r)
        var errno Errno
        setErrno := false
@@ -2957,9 +2556,9 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
        return
 }
 
-// Automatically generated wrapper for Pwrite/pwrite64
-//extern pwrite64
-func c_pwrite64(fd _C_int, buf *byte, count Size_t, offset Offset_t) Ssize_t
+// Automatically generated wrapper for Pwrite/pwrite
+//extern pwrite
+func c_pwrite(fd _C_int, buf *byte, count Size_t, offset Offset_t) Ssize_t
 func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
        var _p2 *byte
        if len(p) > 0 {
@@ -2968,7 +2567,7 @@ func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
                _p2 = (*byte)(unsafe.Pointer(&_zero))
        }
        Entersyscall()
-       _r := c_pwrite64(_C_int(fd), _p2, Size_t(len(p)), Offset_t(offset))
+       _r := c_pwrite(_C_int(fd), _p2, Size_t(len(p)), Offset_t(offset))
        n = (int)(_r)
        var errno Errno
        setErrno := false
@@ -2983,12 +2582,12 @@ func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
        return
 }
 
-// Automatically generated wrapper for Seek/lseek64
-//extern lseek64
-func c_lseek64(fd _C_int, offset Offset_t, whence _C_int) Offset_t
+// Automatically generated wrapper for Seek/lseek
+//extern lseek
+func c_lseek(fd _C_int, offset Offset_t, whence _C_int) Offset_t
 func Seek(fd int, offset int64, whence int) (off int64, err error) {
        Entersyscall()
-       _r := c_lseek64(_C_int(fd), Offset_t(offset), _C_int(whence))
+       _r := c_lseek(_C_int(fd), Offset_t(offset), _C_int(whence))
        off = (int64)(_r)
        var errno Errno
        setErrno := false
@@ -3003,11 +2602,11 @@ func Seek(fd int, offset int64, whence int) (off int64, err error) {
        return
 }
 
-// Automatically generated wrapper for Setrlimit/setrlimit64
-//extern setrlimit64
-func c_setrlimit64(resource int, rlim *Rlimit) _C_int
+// Automatically generated wrapper for Setrlimit/setrlimit
+//extern setrlimit
+func c_setrlimit(resource int, rlim *Rlimit) _C_int
 func Setrlimit(resource int, rlim *Rlimit) (err error) {
-       _r := c_setrlimit64(int(resource), rlim)
+       _r := c_setrlimit(int(resource), rlim)
        var errno Errno
        setErrno := false
        if _r < 0 {
@@ -3020,9 +2619,9 @@ func Setrlimit(resource int, rlim *Rlimit) (err error) {
        return
 }
 
-// Automatically generated wrapper for Stat/stat64
-//extern stat64
-func c_stat64(path *byte, stat *Stat_t) _C_int
+// Automatically generated wrapper for Stat/stat
+//extern stat
+func c_stat(path *byte, stat *Stat_t) _C_int
 func Stat(path string, stat *Stat_t) (err error) {
        var _p1 *byte
        _p1, err = BytePtrFromString(path)
@@ -3030,7 +2629,7 @@ func Stat(path string, stat *Stat_t) (err error) {
                return
        }
        Entersyscall()
-       _r := c_stat64(_p1, stat)
+       _r := c_stat(_p1, stat)
        var errno Errno
        setErrno := false
        if _r < 0 {
@@ -3044,9 +2643,9 @@ func Stat(path string, stat *Stat_t) (err error) {
        return
 }
 
-// Automatically generated wrapper for Truncate/truncate64
-//extern truncate64
-func c_truncate64(path *byte, length Offset_t) _C_int
+// Automatically generated wrapper for Truncate/truncate
+//extern truncate
+func c_truncate(path *byte, length Offset_t) _C_int
 func Truncate(path string, length int64) (err error) {
        var _p1 *byte
        _p1, err = BytePtrFromString(path)
@@ -3054,7 +2653,7 @@ func Truncate(path string, length int64) (err error) {
                return
        }
        Entersyscall()
-       _r := c_truncate64(_p1, Offset_t(length))
+       _r := c_truncate(_p1, Offset_t(length))
        var errno Errno
        setErrno := false
        if _r < 0 {