2024-04-16 TIL 문서 복사

Signed-off-by: rlaisqls <rlaisqls@gmail.com>
rlaisqls · Apr 16, 2024 · 896baba · 896baba
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diff --git a/src/content/docs/TIL/OS/linux/BPF/BPF 프로그램 타입.md b/src/content/docs/TIL/OS/linux/BPF/BPF 프로그램 타입.md
@@ -1,6 +1,6 @@
 ---
 title: 'BPF 프로그램 타입'
-lastUpdated: 2024-03-13T15:17:56
+lastUpdated: 2024-04-16T23:07:02
 ---
 
 BPF 프로그램의 종류는 다양하다. BPF 프로그램은 이벤트를 중심으로 작성되는데, 프로그램 타입에 따라 사용할 수 있는 이벤트가 제한적이므로 작성하고자 하는 프로그램이 어떤 범주에 속하는지 잘 알고 있어야 한다.
@@ -61,7 +61,7 @@ enum bpf_prog_type {
 |소켓 관련|`SOCKET_FILTER`<br>`SK_SKB`<br>`SOCK_OPS`|
 |TC 관련|`BPF_PROG_SCHED_CLS`<br>`BPF_PROG_SCHED_ACT`|
 |XDP 관련|`BPF_PROG_TYPE_XDP`|
-|트레이싱 관련|`BPF_PROG_TYPE_KPROBE`<br>`BPF_PROG_TYPE_TRACEPOINT`<br>`BPF_PROG_TYPE_RERF_EVENT`|
+|트레이싱 관련|`BPF_PROG_TYPE_KPROBE`<br>`BPF_PROG_TYPE_TRACEPOINT`<br>`BPF_PROG_TYPE_PERF_EVENT`|
 |CGROUP 관련|`BPF_PROG_TYPE_CGROUP_SKB`<br>`BPF_PROG_TYPE_CGROUP_SOCK`<br>`BPF_PROG_TYPE_CGROUP_DEVICE`|
 |터널링 관련|`BPF_PROG_TYPE_LWT_IN`<br>`BPF_PROG_TYPE_LWT_OUT`<br>`BPF_PROG_TYPE_LWT_XMIT`<br>`BPF_PROG_TYPE_LWT_SEGGLOCAL`|
 

diff --git a/src/content/docs/TIL/OS/linux/ETC/linux 표준 에러 코드.md b/src/content/docs/TIL/OS/linux/ETC/linux 표준 에러 코드.md
@@ -0,0 +1,178 @@
+---
+title: 'linux 표준 에러 코드'
+lastUpdated: 2024-04-16T23:07:02
+---
+리눅스에서는 시스템 호출 및 라이브러리 함수 호출 중에 오류가 발생하면 해당 오류를 나타내기 위해 정수 형태의 에러 넘버를 사용한다. 이러한 에러 넘버는 errno이라는 전역 변수에 저장되며, 오류가 발생하면 해당 값이 설정된다.
+
+이러한 에러 넘버들은 `errno.h` 헤더 파일에 상수 형태로 정의되어 있다.
+
+- `/usr/include/asm-generic/errno-base.h` : errno 1 ~ 34 까지 정의
+- `/usr/include/asm-generic/errno.h` : errno-base.h를 include하고, errno 35 ~ 133 까지 정의
+
+C언어에서는 `#include <errno.h>` 헤더를 include하여 이 값들을 활용할 수 있다.
+
+아래는 주요 Linux errno 에러 넘버들과 간단한 설명이다.
+
+### `/usr/include/asm-generic/errno-base.h`
+```c
+#ifndef _ASM_GENERIC_ERRNO_BASE_H
+#define _ASM_GENERIC_ERRNO_BASE_H
+
+#define EPERM            1      /* Operation not permitted */
+#define ENOENT           2      /* No such file or directory */
+#define ESRCH            3      /* No such process */
+#define EINTR            4      /* Interrupted system call */
+#define EIO              5      /* I/O error */
+#define ENXIO            6      /* No such device or address */
+#define E2BIG            7      /* Argument list too long */
+#define ENOEXEC          8      /* Exec format error */
+#define EBADF            9      /* Bad file number */
+#define ECHILD          10      /* No child processes */
+#define EAGAIN          11      /* Try again */
+#define ENOMEM          12      /* Out of memory */
+#define EACCES          13      /* Permission denied */
+#define EFAULT          14      /* Bad address */
+#define ENOTBLK         15      /* Block device required */
+#define EBUSY           16      /* Device or resource busy */
+#define EEXIST          17      /* File exists */
+#define EXDEV           18      /* Cross-device link */
+#define ENODEV          19      /* No such device */
+#define ENOTDIR         20      /* Not a directory */
+#define EISDIR          21      /* Is a directory */
+#define EINVAL          22      /* Invalid argument */
+#define ENFILE          23      /* File table overflow */
+#define EMFILE          24      /* Too many open files */
+#define ENOTTY          25      /* Not a typewriter */
+#define ETXTBSY         26      /* Text file busy */
+#define EFBIG           27      /* File too large */
+#define ENOSPC          28      /* No space left on device */
+#define ESPIPE          29      /* Illegal seek */
+#define EROFS           30      /* Read-only file system */
+#define EMLINK          31      /* Too many links */
+#define EPIPE           32      /* Broken pipe */
+#define EDOM            33      /* Math argument out of domain of func */
+#define ERANGE          34      /* Math result not representable */
+
+#endif
+
+```
+### `/usr/include/asm-generic/errno.h`
+```c
+
+#ifndef _ASM_GENERIC_ERRNO_H
+#define _ASM_GENERIC_ERRNO_H
+
+#include <asm-generic/errno-base.h>
+
+#define	EDEADLK		35	/* Resource deadlock would occur */
+#define	ENAMETOOLONG	36	/* File name too long */
+#define	ENOLCK		37	/* No record locks available */
+#define	ENOSYS		38	/* Function not implemented */
+#define	ENOTEMPTY	39	/* Directory not empty */
+#define	ELOOP		40	/* Too many symbolic links encountered */
+#define	EWOULDBLOCK	EAGAIN	/* Operation would block */
+#define	ENOMSG		42	/* No message of desired type */
+#define	EIDRM		43	/* Identifier removed */
+#define	ECHRNG		44	/* Channel number out of range */
+#define	EL2NSYNC	45	/* Level 2 not synchronized */
+#define	EL3HLT		46	/* Level 3 halted */
+#define	EL3RST		47	/* Level 3 reset */
+#define	ELNRNG		48	/* Link number out of range */
+#define	EUNATCH		49	/* Protocol driver not attached */
+#define	ENOCSI		50	/* No CSI structure available */
+#define	EL2HLT		51	/* Level 2 halted */
+#define	EBADE		52	/* Invalid exchange */
+#define	EBADR		53	/* Invalid request descriptor */
+#define	EXFULL		54	/* Exchange full */
+#define	ENOANO		55	/* No anode */
+#define	EBADRQC		56	/* Invalid request code */
+#define	EBADSLT		57	/* Invalid slot */
+
+#define	EDEADLOCK	EDEADLK
+
+#define	EBFONT		59	/* Bad font file format */
+#define	ENOSTR		60	/* Device not a stream */
+#define	ENODATA		61	/* No data available */
+#define	ETIME		62	/* Timer expired */
+#define	ENOSR		63	/* Out of streams resources */
+#define	ENONET		64	/* Machine is not on the network */
+#define	ENOPKG		65	/* Package not installed */
+#define	EREMOTE		66	/* Object is remote */
+#define	ENOLINK		67	/* Link has been severed */
+#define	EADV		68	/* Advertise error */
+#define	ESRMNT		69	/* Srmount error */
+#define	ECOMM		70	/* Communication error on send */
+#define	EPROTO		71	/* Protocol error */
+#define	EMULTIHOP	72	/* Multihop attempted */
+#define	EDOTDOT		73	/* RFS specific error */
+#define	EBADMSG		74	/* Not a data message */
+#define	EOVERFLOW	75	/* Value too large for defined data type */
+#define	ENOTUNIQ	76	/* Name not unique on network */
+#define	EBADFD		77	/* File descriptor in bad state */
+#define	EREMCHG		78	/* Remote address changed */
+#define	ELIBACC		79	/* Can not access a needed shared library */
+#define	ELIBBAD		80	/* Accessing a corrupted shared library */
+#define	ELIBSCN		81	/* .lib section in a.out corrupted */
+#define	ELIBMAX		82	/* Attempting to link in too many shared libraries */
+#define	ELIBEXEC	83	/* Cannot exec a shared library directly */
+#define	EILSEQ		84	/* Illegal byte sequence */
+#define	ERESTART	85	/* Interrupted system call should be restarted */
+#define	ESTRPIPE	86	/* Streams pipe error */
+#define	EUSERS		87	/* Too many users */
+#define	ENOTSOCK	88	/* Socket operation on non-socket */
+#define	EDESTADDRREQ	89	/* Destination address required */
+#define	EMSGSIZE	90	/* Message too long */
+#define	EPROTOTYPE	91	/* Protocol wrong type for socket */
+#define	ENOPROTOOPT	92	/* Protocol not available */
+#define	EPROTONOSUPPORT	93	/* Protocol not supported */
+#define	ESOCKTNOSUPPORT	94	/* Socket type not supported */
+#define	EOPNOTSUPP	95	/* Operation not supported on transport endpoint */
+#define	EPFNOSUPPORT	96	/* Protocol family not supported */
+#define	EAFNOSUPPORT	97	/* Address family not supported by protocol */
+#define	EADDRINUSE	98	/* Address already in use */
+#define	EADDRNOTAVAIL	99	/* Cannot assign requested address */
+#define	ENETDOWN	100	/* Network is down */
+#define	ENETUNREACH	101	/* Network is unreachable */
+#define	ENETRESET	102	/* Network dropped connection because of reset */
+#define	ECONNABORTED	103	/* Software caused connection abort */
+#define	ECONNRESET	104	/* Connection reset by peer */
+#define	ENOBUFS		105	/* No buffer space available */
+#define	EISCONN		106	/* Transport endpoint is already connected */
+#define	ENOTCONN	107	/* Transport endpoint is not connected */
+#define	ESHUTDOWN	108	/* Cannot send after transport endpoint shutdown */
+#define	ETOOMANYREFS	109	/* Too many references: cannot splice */
+#define	ETIMEDOUT	110	/* Connection timed out */
+#define	ECONNREFUSED	111	/* Connection refused */
+#define	EHOSTDOWN	112	/* Host is down */
+#define	EHOSTUNREACH	113	/* No route to host */
+#define	EALREADY	114	/* Operation already in progress */
+#define	EINPROGRESS	115	/* Operation now in progress */
+#define	ESTALE		116	/* Stale NFS file handle */
+#define	EUCLEAN		117	/* Structure needs cleaning */
+#define	ENOTNAM		118	/* Not a XENIX named type file */
+#define	ENAVAIL		119	/* No XENIX semaphores available */
+#define	EISNAM		120	/* Is a named type file */
+#define	EREMOTEIO	121	/* Remote I/O error */
+#define	EDQUOT		122	/* Quota exceeded */
+
+#define	ENOMEDIUM	123	/* No medium found */
+#define	EMEDIUMTYPE	124	/* Wrong medium type */
+#define	ECANCELED	125	/* Operation Canceled */
+#define	ENOKEY		126	/* Required key not available */
+#define	EKEYEXPIRED	127	/* Key has expired */
+#define	EKEYREVOKED	128	/* Key has been revoked */
+#define	EKEYREJECTED	129	/* Key was rejected by service */
+
+/* for robust mutexes */
+#define	EOWNERDEAD	130	/* Owner died */
+#define	ENOTRECOVERABLE	131	/* State not recoverable */
+
+#define ERFKILL		132	/* Operation not possible due to RF-kill */
+
+#endif
+```
+
+---
+참고
+- https://man7.org/linux/man-pages/man3/errno.3.html
+- https://www.gnu.org/software/libc/manual/html_node/Error-Codes.html
diff --git a/src/content/docs/TIL/OS/linux/krobe와 kretprobe.md b/src/content/docs/TIL/OS/linux/krobe와 kretprobe.md
@@ -1,10 +1,10 @@
 ---
 title: 'krobe와 kretprobe'
-lastUpdated: 2024-03-25T23:34:05
+lastUpdated: 2024-04-16T23:07:02
 ---
-kprobe와 kretprobe는 **커널 코드에 동적으로 중단점을 삽입하여 사용자가 정의하는 핸들러 함수가 실행되도록 하는** 강력한 도구이다.  kprobe는 함수 또는 함수에서 특정 오프셋만큼 떨어진 곳에서 핸들러 함수를 실행하게 해주는 도구이다. kretprobe는 함수가 끝난 후에 핸들러 함수를 실행하게 해주는 도구이다.
+kprobe와 kretprobe는 **커널 코드에 동적으로 중단점을 삽입하여 사용자가 정의하는 핸들러 함수가 실행되도록 하는** 강력한 도구이다.  kprobe는 함수 또는 함수에서 특정 오프셋만큼 떨어진 곳에서 핸들러 함수를 실행해주고, kretprobe는 함수가 끝난 후에 핸들러 함수를 실행하게 한다.
 
-BPF에서 실행될 함수를 등록할 때도 uprobe, tracepoint, UDST 등의 툴과 함께 kprobe, kretprobe가 사용된다.
+BPF에서 실행될 함수를 등록할 때도 kprobe, kretprobe가 사용된다. (uprobe, tracepoint, UDST 등도 함께 사용됨)
 
 ## kprobe의 동작 방식
 

diff --git a/...어/Rust/메모리 참조/temporary value is freed.md → ...어/Rust/메모리 참조/temporary value is freed.md b/...어/Rust/메모리 참조/temporary value is freed.md → ...어/Rust/메모리 참조/temporary value is freed.md
@@ -1,6 +1,6 @@
 ---
-title: 'temporary value is freed'
-lastUpdated: 
+title: 'temporary value is freed'
+lastUpdated: 2024-04-16T23:07:02
 ---
 - In Rust, the error `temporary value is freed` occurs when a temporary value is deallocated before it is expected to be used. 
 - This typically happens when the temporary value goes out of scope and its memory is deallocated. If there are still references to this value after deallocation, it leads to a runtime error.