Import unistd.h before calling syscall.#1
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The Linux man page for syscall(2) documents it as:
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <unistd.h>
#include <sys/syscall.h> /* For SYS_xxx definitions */
long syscall(long number, ...);
Therefore unistd.h is required in addition to the already imported
sys/syscall.h and the already defined _GNU_SOURCE.
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The Linux man page for syscall(2) documents it as:
Therefore unistd.h is required in addition to the already imported
sys/syscall.h and the already defined _GNU_SOURCE.