diff options
Diffstat (limited to 'man2/kcmp.2')
| -rw-r--r-- | man2/kcmp.2 | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/man2/kcmp.2 b/man2/kcmp.2 index 98a29f1..cfd65df 100644 --- a/man2/kcmp.2 +++ b/man2/kcmp.2 @@ -5,7 +5,7 @@ .\" .\" Kernel commit d97b46a64674a267bc41c9e16132ee2a98c3347d .\" -.TH kcmp 2 2023-05-03 "Linux man-pages 6.05.01" +.TH kcmp 2 2023-10-31 "Linux man-pages 6.7" .SH NAME kcmp \- compare two processes to determine if they share a kernel resource .SH LIBRARY @@ -16,11 +16,11 @@ Standard C library .BR "#include <linux/kcmp.h>" " /* Definition of " KCMP_* " constants */" .BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */" .B #include <unistd.h> -.PP +.P .BI "int syscall(SYS_kcmp, pid_t " pid1 ", pid_t " pid2 ", int " type , .BI " unsigned long " idx1 ", unsigned long " idx2 ); .fi -.PP +.P .IR Note : glibc provides no wrapper for .BR kcmp (), @@ -35,7 +35,7 @@ and .I pid2 share a kernel resource such as virtual memory, file descriptors, and so on. -.PP +.P Permission to employ .BR kcmp () is governed by ptrace access mode @@ -46,7 +46,7 @@ and .IR pid2 ; see .BR ptrace (2). -.PP +.P The .I type argument specifies which resource is to be compared in the two processes. @@ -161,7 +161,7 @@ The argument .I idx2 is a pointer to a structure where the target file is described. This structure has the form: -.PP +.P .in +4n .EX struct kcmp_epoll_slot { @@ -171,7 +171,7 @@ struct kcmp_epoll_slot { }; .EE .in -.PP +.P Within this structure, .I efd is an epoll file descriptor returned from @@ -183,7 +183,7 @@ is a target file offset counted from zero. Several different targets may be registered with the same file descriptor number and setting a specific offset helps to investigate each of them. -.PP +.P Note the .BR kcmp () is not protected against false positives which may occur if @@ -199,7 +199,7 @@ The return value of a successful call to is simply the result of arithmetic comparison of kernel pointers (when the kernel compares resources, it uses their memory addresses). -.PP +.P The easiest way to explain is to consider an example. Suppose that .I v1 @@ -231,11 +231,11 @@ is not equal to .IR v2 , but ordering information is unavailable. .RE -.PP +.P On error, \-1 is returned, and .I errno is set to indicate the error. -.PP +.P .BR kcmp () was designed to return values suitable for sorting. This is particularly handy if one needs to compare @@ -291,7 +291,7 @@ does not exist. Linux. .SH HISTORY Linux 3.5. -.PP +.P Before Linux 5.12, this system call is available only if the kernel is configured with .BR CONFIG_CHECKPOINT_RESTORE , @@ -317,7 +317,7 @@ the same open file description. The program tests different cases for the file descriptor pairs, as described in the program output. An example run of the program is as follows: -.PP +.P .in +4n .EX $ \fB./a.out\fP |