Jeul CCC: syscall prctl()

2022年10月1日星期六

process control

#include <sys/prctl.h>

int prctl(int option, unsigned long arg2, unsigned long arg3,
          unsigned long arg4, unsigned long arg5);

第一個引數決定要做什麼和定義後續引數怎麼用，可以是：

PR_CAP_AMBIENT (Linux 4.3+)
PR_CAPBSET_READ (Linux 2.6.25+)
PR_CAPBSET_DROP (Linux 2.6.25+)
PR_SET_CHILD_SUBREAPER (Linux 3.4+)
PR_GET_CHILD_SUBREAPER (Linux 3.4+)
PR_SET_DUMPABLE
PR_GET_DUMPABLE
PR_SET_KEEPCAPS
PR_GET_KEEPCAPS
PR_MCE_KILL (Linux 2.6.32+)
PR_MCE_KILL_GET (Linux 2.6.32+)
PR_SET_MM (Linux 3.3+)
PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMENT (since Linux 3.19+)
PR_SET_NAME (Linux 2.6.9+)：設定自己 thread 名稱為 (char *)arg2，和 pthread_setname_np() 設定的、pthread_getname_np() 取得的屬性一樣，也可以透過 /proc/self/task/[tid]/comm 存取 (Linux 2.6.33+)。
PR_GET_NAME (Linux 2.6.11+)：在 (char *)arg2 給 buffer 供回傳 thread 名稱字串，buffer 應該要有 16-byte 空間。
PR_SET_NO_NEW_PRIVS (Linux 3.5+)
PR_GET_NO_NEW_PRIVS (Linux 3.5+)
PR_SET_PDEATHSIG
PR_GET_PDEATHSIG
PR_SET_PTRACER (Linux 3.4+)
PR_SET_SECCOMP (Linux 2.6.23+)
PR_GET_SECCOMP (Linux 2.6.23+)
PR_SET_SECUREBITS (Linux 2.6.26+)
PR_GET_SECUREBITS (Linux 2.6.26+)
PR_GET_SPECULATION_CTRL (Linux 4.17+)
PR_SET_SPECULATION_CTRL (Linux 4.17+)
PR_SET_THP_DISABLE (Linux 3.15+)
PR_TASK_PERF_EVENTS_DISABLE (Linux 2.6.31+)
PR_TASK_PERF_EVENTS_ENABLE (Linux 2.6.31+)
PR_GET_THP_DISABLE (Linux 3.15+)
PR_GET_TID_ADDRESS (Linux 3.5+)
PR_SET_TIMERSLACK (Linux 2.6.28+)
PR_GET_TIMERSLACK (Linux 2.6.28+)
PR_SET_TIMING
PR_GET_TIMING
PR_SET_TSC (Linux 2.6.26+, x86 only)
PR_GET_TSC (Linux 2.6.26+, x86 only)
PR_SET_UNALIGN
PR_GET_UNALIGN

參考：man prctl

Jeul CCC