~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/uapi/linux/msg.h

Version: ~ [ linux-6.12-rc7 ] ~ [ linux-6.11.7 ] ~ [ linux-6.10.14 ] ~ [ linux-6.9.12 ] ~ [ linux-6.8.12 ] ~ [ linux-6.7.12 ] ~ [ linux-6.6.60 ] ~ [ linux-6.5.13 ] ~ [ linux-6.4.16 ] ~ [ linux-6.3.13 ] ~ [ linux-6.2.16 ] ~ [ linux-6.1.116 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.171 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.229 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.285 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.323 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.336 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.4.302 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.12 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

Diff markup

Differences between /include/uapi/linux/msg.h (Version linux-6.12-rc7) and /include/uapi/linux/msg.h (Version linux-4.18.20)


  1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux      1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2 #ifndef _UAPI_LINUX_MSG_H                           2 #ifndef _UAPI_LINUX_MSG_H
  3 #define _UAPI_LINUX_MSG_H                           3 #define _UAPI_LINUX_MSG_H
  4                                                     4 
  5 #include <linux/ipc.h>                              5 #include <linux/ipc.h>
  6                                                     6 
  7 /* ipcs ctl commands */                             7 /* ipcs ctl commands */
  8 #define MSG_STAT 11                                 8 #define MSG_STAT 11
  9 #define MSG_INFO 12                                 9 #define MSG_INFO 12
 10 #define MSG_STAT_ANY 13                            10 #define MSG_STAT_ANY 13
 11                                                    11 
 12 /* msgrcv options */                               12 /* msgrcv options */
 13 #define MSG_NOERROR     010000  /* no error if     13 #define MSG_NOERROR     010000  /* no error if message is too big */
 14 #define MSG_EXCEPT      020000  /* recv any ms     14 #define MSG_EXCEPT      020000  /* recv any msg except of specified type.*/
 15 #define MSG_COPY        040000  /* copy (not r     15 #define MSG_COPY        040000  /* copy (not remove) all queue messages */
 16                                                    16 
 17 /* Obsolete, used only for backwards compatibi     17 /* Obsolete, used only for backwards compatibility and libc5 compiles */
 18 struct msqid_ds {                                  18 struct msqid_ds {
 19         struct ipc_perm msg_perm;                  19         struct ipc_perm msg_perm;
 20         struct msg *msg_first;          /* fir     20         struct msg *msg_first;          /* first message on queue,unused  */
 21         struct msg *msg_last;           /* las     21         struct msg *msg_last;           /* last message in queue,unused */
 22         __kernel_old_time_t msg_stime;  /* las !!  22         __kernel_time_t msg_stime;      /* last msgsnd time */
 23         __kernel_old_time_t msg_rtime;  /* las !!  23         __kernel_time_t msg_rtime;      /* last msgrcv time */
 24         __kernel_old_time_t msg_ctime;  /* las !!  24         __kernel_time_t msg_ctime;      /* last change time */
 25         unsigned long  msg_lcbytes;     /* Reu     25         unsigned long  msg_lcbytes;     /* Reuse junk fields for 32 bit */
 26         unsigned long  msg_lqbytes;     /* dit     26         unsigned long  msg_lqbytes;     /* ditto */
 27         unsigned short msg_cbytes;      /* cur     27         unsigned short msg_cbytes;      /* current number of bytes on queue */
 28         unsigned short msg_qnum;        /* num     28         unsigned short msg_qnum;        /* number of messages in queue */
 29         unsigned short msg_qbytes;      /* max     29         unsigned short msg_qbytes;      /* max number of bytes on queue */
 30         __kernel_ipc_pid_t msg_lspid;   /* pid     30         __kernel_ipc_pid_t msg_lspid;   /* pid of last msgsnd */
 31         __kernel_ipc_pid_t msg_lrpid;   /* las     31         __kernel_ipc_pid_t msg_lrpid;   /* last receive pid */
 32 };                                                 32 };
 33                                                    33 
 34 /* Include the definition of msqid64_ds */         34 /* Include the definition of msqid64_ds */
 35 #include <asm/msgbuf.h>                            35 #include <asm/msgbuf.h>
 36                                                    36 
 37 /* message buffer for msgsnd and msgrcv calls      37 /* message buffer for msgsnd and msgrcv calls */
 38 struct msgbuf {                                    38 struct msgbuf {
 39         __kernel_long_t mtype;          /* typ     39         __kernel_long_t mtype;          /* type of message */
 40         char mtext[1];                  /* mes     40         char mtext[1];                  /* message text */
 41 };                                                 41 };
 42                                                    42 
 43 /* buffer for msgctl calls IPC_INFO, MSG_INFO      43 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
 44 struct msginfo {                                   44 struct msginfo {
 45         int msgpool;                               45         int msgpool;
 46         int msgmap;                                46         int msgmap; 
 47         int msgmax;                                47         int msgmax; 
 48         int msgmnb;                                48         int msgmnb; 
 49         int msgmni;                                49         int msgmni; 
 50         int msgssz;                                50         int msgssz; 
 51         int msgtql;                                51         int msgtql; 
 52         unsigned short  msgseg;                    52         unsigned short  msgseg; 
 53 };                                                 53 };
 54                                                    54 
 55 /*                                                 55 /*
 56  * MSGMNI, MSGMAX and MSGMNB are default value     56  * MSGMNI, MSGMAX and MSGMNB are default values which can be
 57  * modified by sysctl.                             57  * modified by sysctl.
 58  *                                                 58  *
 59  * MSGMNI is the upper limit for the number of     59  * MSGMNI is the upper limit for the number of messages queues per
 60  * namespace.                                      60  * namespace.
 61  * It has been chosen to be as large possible      61  * It has been chosen to be as large possible without facilitating
 62  * scenarios where userspace causes overflows      62  * scenarios where userspace causes overflows when adjusting the limits via
 63  * operations of the form retrieve current lim     63  * operations of the form retrieve current limit; add X; update limit".
 64  *                                                 64  *
 65  * MSGMNB is the default size of a new message     65  * MSGMNB is the default size of a new message queue. Non-root tasks can
 66  * decrease the size with msgctl(IPC_SET), roo     66  * decrease the size with msgctl(IPC_SET), root tasks
 67  * (actually: CAP_SYS_RESOURCE) can both incre     67  * (actually: CAP_SYS_RESOURCE) can both increase and decrease the queue
 68  * size. The optimal value is application depe     68  * size. The optimal value is application dependent.
 69  * 16384 is used because it was always used (s     69  * 16384 is used because it was always used (since 0.99.10)
 70  *                                                 70  *
 71  * MAXMAX is the maximum size of an individual     71  * MAXMAX is the maximum size of an individual message, it's a global
 72  * (per-namespace) limit that applies for all      72  * (per-namespace) limit that applies for all message queues.
 73  * It's set to 1/2 of MSGMNB, to ensure that a     73  * It's set to 1/2 of MSGMNB, to ensure that at least two messages fit into
 74  * the queue. This is also an arbitrary choice     74  * the queue. This is also an arbitrary choice (since 2.6.0).
 75  */                                                75  */
 76                                                    76 
 77 #define MSGMNI 32000   /* <= IPCMNI */     /*      77 #define MSGMNI 32000   /* <= IPCMNI */     /* max # of msg queue identifiers */
 78 #define MSGMAX  8192   /* <= INT_MAX */   /* m     78 #define MSGMAX  8192   /* <= INT_MAX */   /* max size of message (bytes) */
 79 #define MSGMNB 16384   /* <= INT_MAX */   /* d     79 #define MSGMNB 16384   /* <= INT_MAX */   /* default max size of a message queue */
 80                                                    80 
 81 /* unused */                                       81 /* unused */
 82 #define MSGPOOL (MSGMNI * MSGMNB / 1024) /* si     82 #define MSGPOOL (MSGMNI * MSGMNB / 1024) /* size in kbytes of message pool */
 83 #define MSGTQL  MSGMNB            /* number of     83 #define MSGTQL  MSGMNB            /* number of system message headers */
 84 #define MSGMAP  MSGMNB            /* number of     84 #define MSGMAP  MSGMNB            /* number of entries in message map */
 85 #define MSGSSZ  16                /* message s     85 #define MSGSSZ  16                /* message segment size */
 86 #define __MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /     86 #define __MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /* max no. of segments */
 87 #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG      87 #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
 88                                                    88 
 89                                                    89 
 90 #endif /* _UAPI_LINUX_MSG_H */                     90 #endif /* _UAPI_LINUX_MSG_H */
 91                                                    91 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

sflogo.php