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Operating Systems · System Calls
Official IIT answer key · IIT Bombay · Audited Aug 2026
GATE CSE 2021 Set 1 Q14 · MSQ · 1 mark
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Topic notes
GATE tests System Calls through two primary angles: conceptual understanding of dual-mode operation (distinguishing user-level library routines and mode switches from true kernel-level traps and process switches) and algorithmic tracing of process control system calls like fork() and wait(). Recent papers feature multi-select questions (MSQs) probing which events or C standard library functions strictly trigger kernel transitions, alongside numerical answer type (NAT) questions involving state-tree tracing over loops of system calls.
Full System Calls guide →Which of the following standard C library functions will always invoke a system call when executed from a single-threaded process in a UNIX/Linux operating system?
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