/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Program: REDIR.C Author: F. PIETTE (2:293/2201.135) Object: Demonstration of the output redirection Creation: Augustus 2, 1991 Updates: * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ #include #include #include #include #include #include void main(void) { int old_fh; int new_fh; fprintf(stdout, "This goes to the original standard output\n"); /* Duplicate the stdout file handle to restore it later */ old_fh = dup(fileno(stdout)); if (old_fh == -1) { fprintf(stderr, "dup error\n"); exit(1); } /* Open the new file for output */ if ((new_fh = open("redir.txt", O_CREAT | O_TRUNC | O_WRONLY, S_IREAD | S_IWRITE)) == -1) { fprintf(stderr, "Unable to open redir.txt\n"); exit(1); } /* Duplicate the new handle to stdout */ dup2(new_fh, fileno(stdout)); /* We don't need new_fh any more, so close it */ close(new_fh); /* stdout is now redirected, let's try it */ fprintf(stdout, "This goes to redir.txt file !\n"); /* If you run a program using spawn(), the child program will have */ /* its output redirected to REDIR.TXT file ! */ /* Now let's restore stdout to its original state */ fflush(stdout); /* First flush the outut buffer */ /* Then duplicate the original file handle to stdout */ dup2(old_fh, fileno(stdout)); /* Let's try if we canceled the redirection */ fprintf(stdout, "Back to original stdout\n"); exit(0); } >log tree commit diff

path: root/drivers/usb/c67x00

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