linux:architectuur:copyfile.c
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linux:architectuur:copyfile.c [2018/12/30 17:17] |
linux:architectuur:copyfile.c [2018/12/30 17:17] (huidige) |
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| + | ====== copyfile.c ====== | ||
| + | |||
| + | <file c copyfile.c> | ||
| + | /* Copy a file W20010401*/ | ||
| + | /* This program illustrates basic file operations in Unix. */ | ||
| + | /* Warning: This is a dangerous program! */ | ||
| + | /* It is not a replacement for cp! */ | ||
| + | /* Copyright & Disclaimer: See bottom of document */ | ||
| + | /* */ | ||
| + | /* Usage: */ | ||
| + | /* $ copyfile <source_file> <dest_file> */ | ||
| + | |||
| + | |||
| + | #include <stdio.h> | ||
| + | #include <stdlib.h> | ||
| + | #include <sys/types.h> | ||
| + | #include <sys/stat.h> | ||
| + | #include <fcntl.h> | ||
| + | |||
| + | |||
| + | main(int argc, char *argv[]) /* argc: arg count */ | ||
| + | /* argv: arg vector */ | ||
| + | { | ||
| + | |||
| + | char buffer[512]; /* declare i/o buffer */ | ||
| + | int fd1; /* file descriptor 1 */ | ||
| + | int fd2; /* file descriptor 2 */ | ||
| + | int in; /* nr. of bytes input */ | ||
| + | int out; /* nr. of bytes output */ | ||
| + | |||
| + | |||
| + | fd1 = open(argv[1], O_RDONLY); | ||
| + | |||
| + | fprintf(stderr, "fd1: %d\n", fd1); /* print fd1 */ | ||
| + | if (fd1 < 0) exit(2); | ||
| + | |||
| + | fd2 = open(argv[2], O_WRONLY|O_CREAT, 0644); | ||
| + | |||
| + | fprintf(stderr, "fd2: %d\n", fd2); /* print fd2 */ | ||
| + | if (fd2 < 0) exit(3); | ||
| + | |||
| + | |||
| + | while (1) | ||
| + | { | ||
| + | in = read(fd1, buffer, sizeof(buffer)); | ||
| + | fprintf(stderr, "in : %d\n", in); /* print in bytes */ | ||
| + | if (in <= 0) break; | ||
| + | |||
| + | out = write(fd2, buffer, in); | ||
| + | fprintf(stderr, "out: %d\n", out); /* print out bytes */ | ||
| + | if (out < 0) exit (8); | ||
| + | } | ||
| + | |||
| + | close(fd1); | ||
| + | close(fd2); | ||
| + | exit (0); | ||
| + | |||
| + | } /* end of program */ | ||
| + | |||
| + | /* | ||
| + | Copyright (C) 2003 Integrated Services; Tux4u.nl | ||
| + | Author: Ing.J.M.Waldorp | ||
| + | copyfile.c 20030514 | ||
| + | |||
| + | License: GPL v2 | ||
| + | See: http://www.tux4u.nl | ||
| + | or: http://www.fsf.org | ||
| + | |||
| + | Disclaimer | ||
| + | |||
| + | This document is provided "as is" in the hope that it will be useful, | ||
| + | but WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, | ||
| + | including, but not limited to, the implied warranty of FITNESS FOR A | ||
| + | PARTICULAR PURPOSE. Integrated Services DISAVOWS ANY POTENTIAL | ||
| + | LIABILITY for the contents of this document. The use of the concepts, | ||
| + | examples and/or other content of this document is ENTIRELY AT YOUR | ||
| + | OWN RISK. | ||
| + | |||
| + | Use of a term in this document should not be regarded as affecting | ||
| + | the validity of any trade mark or service mark. Naming of particular | ||
| + | products or brands should not be regarded as endorsements. | ||
| + | */ | ||
| + | </file> | ||
linux/architectuur/copyfile.c.txt ยท Laatst gewijzigd: 2018/12/30 17:17 (Externe bewerking)
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