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The full set of system calls may be reviewed in the file “sysent.c” on Sheet 29, but more relevantly, these are discussed in full detail in Section II of the UPM.
The procedures which handle the system calls are found mostly in the files “sysl.c”, sys2.c“, sys3.c” and “sys4.c”.
Two important “trivial” procedures are “nullsys” (2855) and “nosys” (2864) which are found in the file “trap.c”.
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