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27 lines
730 B
27 lines
730 B
/* getc.c - getc */ |
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#include <xinu.h> |
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/*------------------------------------------------------------------------ |
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* getc - Obtain one byte from a device |
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*------------------------------------------------------------------------ |
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*/ |
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syscall getc( |
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did32 descrp /* Descriptor for device */ |
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) |
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{ |
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intmask mask; /* Saved interrupt mask */ |
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// struct dentry *devptr; /* Entry in device switch table */ |
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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->dvgetc) (devptr); |
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restore(mask); |
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return retval; |
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}
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