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Import unistd.h before calling syscall. #1

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Import unistd.h before calling syscall. #1

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Commits on Jun 25, 2021

  1. Import unistd.h before calling syscall. 

    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.
    @eatnumber1
    eatnumber1 committed Jun 25, 2021
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