diff options
Diffstat (limited to 'man2/posix_fadvise.2')
| -rw-r--r-- | man2/posix_fadvise.2 | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/man2/posix_fadvise.2 b/man2/posix_fadvise.2 index 38e9745..96c06a7 100644 --- a/man2/posix_fadvise.2 +++ b/man2/posix_fadvise.2 @@ -6,7 +6,7 @@ .\" 2005-04-08 mtk, noted kernel version and added BUGS .\" 2010-10-09, mtk, document arm_fadvise64_64() .\" -.TH posix_fadvise 2 2023-03-30 "Linux man-pages 6.05.01" +.TH posix_fadvise 2 2023-10-31 "Linux man-pages 6.7" .SH NAME posix_fadvise \- predeclare an access pattern for file data .SH LIBRARY @@ -15,17 +15,17 @@ Standard C library .SH SYNOPSIS .nf .B #include <fcntl.h> -.PP +.P .BI "int posix_fadvise(int " fd ", off_t " offset ", off_t " len \ ", int " advice ");" .fi -.PP +.P .ad l .RS -4 Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .RE -.PP +.P .BR posix_fadvise (): .nf _POSIX_C_SOURCE >= 200112L @@ -36,14 +36,14 @@ Programs can use to announce an intention to access file data in a specific pattern in the future, thus allowing the kernel to perform appropriate optimizations. -.PP +.P The \fIadvice\fP applies to a (not necessarily existent) region starting at \fIoffset\fP and extending for \fIlen\fP bytes (or until the end of the file if \fIlen\fP is 0) within the file referred to by \fIfd\fP. The \fIadvice\fP is not binding; it merely constitutes an expectation on behalf of the application. -.PP +.P Permissible values for \fIadvice\fP include: .TP .B POSIX_FADV_NORMAL @@ -159,16 +159,16 @@ Therefore, these architectures define a version of the system call that orders the arguments suitably, but is otherwise exactly the same as .BR posix_fadvise (). -.PP +.P For example, since Linux 2.6.14, ARM has the following system call: -.PP +.P .in +4n .EX .BI "long arm_fadvise64_64(int " fd ", int " advice , .BI " loff_t " offset ", loff_t " len ); .EE .in -.PP +.P These architecture-specific details are generally hidden from applications by the glibc .BR posix_fadvise () @@ -178,7 +178,7 @@ which invokes the appropriate architecture-specific system call. POSIX.1-2008. .SH HISTORY POSIX.1-2001. -.PP +.P Kernel support first appeared in Linux 2.5.60; the underlying system call is called .BR fadvise64 (). @@ -186,14 +186,14 @@ the underlying system call is called Library support has been provided since glibc 2.2, via the wrapper function .BR posix_fadvise (). -.PP +.P Since Linux 3.18, .\" commit d3ac21cacc24790eb45d735769f35753f5b56ceb support for the underlying system call is optional, depending on the setting of the .B CONFIG_ADVISE_SYSCALLS configuration option. -.PP +.P The type of the .I len argument was changed from @@ -206,7 +206,7 @@ The contents of the kernel buffer cache can be cleared via the .I /proc/sys/vm/drop_caches interface described in .BR proc (5). -.PP +.P One can obtain a snapshot of which pages of a file are resident in the buffer cache by opening a file, mapping it with .BR mmap (2), |