54 lines
851 B
C
54 lines
851 B
C
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/* $Header$ */
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#include <system.h>
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extern File *_get_entry();
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int
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sys_open(path, flag, filep)
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char *path;
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int flag;
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File **filep;
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{
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register fd;
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register File *fp;
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int open_mode;
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long lseek();
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switch (flag) {
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case OP_READ:
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open_mode = 0;
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break;
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case OP_WRITE:
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case OP_APPEND:
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open_mode = 1;
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break;
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default:
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return 0;
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}
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if ((fp = _get_entry()) == (File *)0)
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return 0;
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if (flag == OP_WRITE) {
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if ((fd = creat(path, 0644)) < 0)
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return 0;
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}
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else /* OP_READ or OP_APPEND */
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if ((fd = open(path, open_mode)) < 0) {
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if (flag == OP_READ || access(path, 0) == 0)
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return 0;
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/* now: flag == OP_APPEND */
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if ((fd = creat(path, 0644)) < 0)
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return 0;
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}
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else {
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if (flag == OP_APPEND && (lseek(fd, 0L, 2) < 0L)) {
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close(fd);
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return 0;
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}
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}
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fp->o_flags = flag;
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fp->o_fd = fd;
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*filep = fp;
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return 1;
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}
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