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28 lines
802 B
28 lines
802 B
/* open.c - open */ |
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#include <xinu.h> |
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/*------------------------------------------------------------------------ |
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* open - Open a device (some devices ignore name and mode parameters) |
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*------------------------------------------------------------------------ |
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*/ |
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syscall open( |
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did32 descrp, /* Descriptor for device */ |
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char *name, /* Name to use, if any */ |
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char *mode /* Mode for device, if any */ |
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) |
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{ |
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intmask mask; /* Saved interrupt mask */ |
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const __flash struct dentry *devptr; /* Entry in device switch table */ |
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int32 retval; /* Value to return to caller */ |
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mask = disable(); |
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if (isbaddev(descrp)) { |
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restore(mask); |
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return SYSERR; |
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} |
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devptr = (struct dentry *) &devtab[descrp]; |
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retval = (*devptr->dvopen) (devptr, name, mode); |
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restore(mask); |
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return retval; |
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}
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