45 lines
1.3 KiB
Plaintext
45 lines
1.3 KiB
Plaintext
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typedef struct {
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int fd;
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int fd_new;
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int fd_copy;
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char *filename;
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int flags;
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} Redirect;
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Redirect in = {.fd = STDIN_FILENO, .fd_new = -1, .fd_copy = -1, .filename = NULL, .flags = O_RDONLY};
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Redirect out = {.fd = STDOUT_FILENO, .fd_new = -1, .fd_copy = -1, .filename = NULL, .flags = O_WRONLY | O_CREAT | O_TRUNC};
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Redirect err = {.fd = STDERR_FILENO, .fd_new = -1, .fd_copy = -1, .filename = NULL, .flags = O_WRONLY | O_CREAT | O_TRUNC};
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void open_redirect(Redirect *redirect) {
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redirect->fd_copy = dup(redirect->fd);
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if (redirect->fd_copy == -1) {
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perror("dup");
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}
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else {
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redirect->fd_new = open(redirect->filename, redirect->flags, 0664);
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if (redirect->fd_new == -1) {
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fprintf(stderr, "open: Could not open file %s: \"%s\"\n", redirect->filename, strerror(errno));
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}
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else {
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if (close(redirect->fd) == -1) {
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perror("close");
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}
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if (dup(redirect->fd_new) == -1) {
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perror("dup");
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}
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}
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}
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}
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void close_redirect(Redirect *redirect) {
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if (close(redirect->fd_new) == -1) {
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perror("close");
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}
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if (dup2(redirect->fd_copy, redirect->fd) == -1) {
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perror("dup2");
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}
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if (close(redirect->fd_copy) == -1) {
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perror("close");
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}
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}
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