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Annotation of 43BSDReno/lib/libc/sys/truncate.2, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1983 The Regents of the University of California.
                      2: .\" All rights reserved.
                      3: .\"
                      4: .\" Redistribution and use in source and binary forms are permitted provided
                      5: .\" that: (1) source distributions retain this entire copyright notice and
                      6: .\" comment, and (2) distributions including binaries display the following
                      7: .\" acknowledgement:  ``This product includes software developed by the
                      8: .\" University of California, Berkeley and its contributors'' in the
                      9: .\" documentation or other materials provided with the distribution and in
                     10: .\" all advertising materials mentioning features or use of this software.
                     11: .\" Neither the name of the University nor the names of its contributors may
                     12: .\" be used to endorse or promote products derived from this software without
                     13: .\" specific prior written permission.
                     14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     15: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     16: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     17: .\"
                     18: .\"    @(#)truncate.2  6.8 (Berkeley) 6/23/90
                     19: .\"
                     20: .TH TRUNCATE 2 "June 23, 1990"
                     21: .UC 5
                     22: .SH NAME
                     23: truncate \- truncate a file to a specified length
                     24: .SH SYNOPSIS
                     25: .nf
                     26: .ft B
                     27: truncate(path, length)
                     28: char *path;
                     29: off_t length;
                     30: .PP
                     31: .ft B
                     32: ftruncate(fd, length)
                     33: int fd;
                     34: off_t length;
                     35: .fi
                     36: .SH DESCRIPTION
                     37: .I Truncate
                     38: causes the file named by
                     39: .I path
                     40: or referenced by
                     41: .I fd
                     42: to be truncated to at most
                     43: .I length
                     44: bytes in size.  If the file previously
                     45: was larger than this size, the extra data
                     46: is lost.
                     47: With
                     48: .IR ftruncate ,
                     49: the file must be open for writing.
                     50: .SH "RETURN VALUES
                     51: A value of 0 is returned if the call succeeds.  If the call
                     52: fails a \-1 is returned, and the global variable \fIerrno\fP
                     53: specifies the error.
                     54: .SH "ERRORS
                     55: .I Truncate
                     56: succeeds unless:
                     57: .TP 15
                     58: [ENOTDIR]
                     59: A component of the path prefix is not a directory.
                     60: .TP 15
                     61: [EINVAL]
                     62: The pathname contains a character with the high-order bit set.
                     63: .TP 15
                     64: [ENAMETOOLONG]
                     65: A component of a pathname exceeded 255 characters,
                     66: or an entire path name exceeded 1023 characters.
                     67: .TP 15
                     68: [ENOENT]
                     69: The named file does not exist.
                     70: .TP 15
                     71: [EACCES]
                     72: Search permission is denied for a component of the path prefix.
                     73: .TP 15
                     74: [EACCES]
                     75: The named file is not writable by the user.
                     76: .TP 15
                     77: [ELOOP]
                     78: Too many symbolic links were encountered in translating the pathname.
                     79: .TP 15
                     80: [EISDIR]
                     81: The named file is a directory.
                     82: .TP 15
                     83: [EROFS]
                     84: The named file resides on a read-only file system.
                     85: .TP 15
                     86: [ETXTBSY]
                     87: The file is a pure procedure (shared text) file that is being executed.
                     88: .TP 15
                     89: [EIO]
                     90: An I/O error occurred updating the inode.
                     91: .TP 15
                     92: [EFAULT]
                     93: .I Path
                     94: points outside the process's allocated address space.
                     95: .PP
                     96: .I Ftruncate
                     97: succeeds unless:
                     98: .TP 15
                     99: [EBADF]
                    100: The
                    101: .I fd
                    102: is not a valid descriptor.
                    103: .TP 15
                    104: [EINVAL]
                    105: The
                    106: .I fd
                    107: references a socket, not a file.
                    108: .TP 15
                    109: [EINVAL]
                    110: The
                    111: .I fd
                    112: is not open for writing.
                    113: .SH "SEE ALSO"
                    114: open(2)
                    115: .SH BUGS
                    116: These calls should be generalized to allow ranges
                    117: of bytes in a file to be discarded.

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