diff options
Diffstat (limited to 'man2/openat2.2')
| -rw-r--r-- | man2/openat2.2 | 34 |
1 files changed, 17 insertions, 17 deletions
diff --git a/man2/openat2.2 b/man2/openat2.2 index b98bbaf..4a19439 100644 --- a/man2/openat2.2 +++ b/man2/openat2.2 @@ -1,7 +1,7 @@ .\" Copyright (C) 2019 Aleksa Sarai <cyphar@cyphar.com> .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft -.TH openat2 2 2023-04-23 "Linux man-pages 6.05.01" +.TH openat2 2 2024-02-25 "Linux man-pages 6.7" .SH NAME openat2 \- open and possibly create a file (extended) .SH LIBRARY @@ -14,11 +14,11 @@ Standard C library .BR "#include <linux/openat2.h>" " /* Definition of " RESOLVE_* " constants */" .BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */" .B #include <unistd.h> -.PP +.P .BI "long syscall(SYS_openat2, int " dirfd ", const char *" pathname , .BI " struct open_how *" how ", size_t " size ); .fi -.PP +.P .IR Note : glibc provides no wrapper for .BR openat2 (), @@ -30,7 +30,7 @@ The system call is an extension of .BR openat (2) and provides a superset of its functionality. -.PP +.P The .BR openat2 () system call opens the file specified by @@ -40,7 +40,7 @@ If the specified file does not exist, it may optionally (if is specified in .IR how.flags ) be created. -.PP +.P As with .BR openat (2), if @@ -64,7 +64,7 @@ in which case .I pathname is resolved relative to .IR dirfd ). -.PP +.P Rather than taking a single .I flags argument, an extensible structure (\fIhow\fP) is passed to allow for @@ -90,7 +90,7 @@ This argument is a pointer to an structure, described in .BR open_how (2type). -.PP +.P Any future extensions to .BR openat2 () will be implemented as new fields appended to the @@ -105,7 +105,7 @@ initialization. (See the "Extensibility" section of the .B NOTES for more detail on why this is necessary.) -.PP +.P The fields of the .I open_how structure are as follows: @@ -374,7 +374,7 @@ in the kernel's lookup cache. If any kind of revalidation or I/O is needed to satisfy the lookup, .BR openat2 () fails with the error -.B EAGAIN . +.BR EAGAIN . This is useful in providing a fast-path open that can be performed without resorting to thread offload, or other mechanisms that an application might use to offload slower operations. @@ -421,7 +421,7 @@ information. The caller should retry without .B RESOLVE_CACHED set in -.I how.resolve . +.IR how.resolve . .TP .B EINVAL An unknown flag or invalid value was specified in @@ -471,7 +471,7 @@ Linux. .SH HISTORY Linux 5.6. .\" commit fddb5d430ad9fa91b49b1d34d0202ffe2fa0e179 -.PP +.P The semantics of .B RESOLVE_BENEATH were modeled after FreeBSD's @@ -495,7 +495,7 @@ This extensibility design is very similar to other system calls such as .BR perf_event_open (2), and .BR clone3 (2). -.PP +.P If we let .I usize be the size of the structure as specified by the user-space application, and @@ -538,7 +538,7 @@ If any unsupported extension fields are nonzero, then \-1 is returned and is set to .BR E2BIG . This provides forwards-compatibility. -.PP +.P Because the definition of .I struct open_how may change in the future (with new fields being added when system headers are @@ -548,18 +548,18 @@ to ensure that recompiling the program with new headers will not result in spurious errors at run time. The simplest way is to use a designated initializer: -.PP +.P .in +4n .EX struct open_how how = { .flags = O_RDWR, .resolve = RESOLVE_IN_ROOT }; .EE .in -.PP +.P or explicitly using .BR memset (3) or similar: -.PP +.P .in +4n .EX struct open_how how; @@ -568,7 +568,7 @@ how.flags = O_RDWR; how.resolve = RESOLVE_IN_ROOT; .EE .in -.PP +.P A user-space application that wishes to determine which extensions the running kernel supports can do so by conducting a binary search on .I size |