diff options
Diffstat (limited to '')
-rw-r--r-- | man2/signalfd.2 | 34 |
1 files changed, 19 insertions, 15 deletions
diff --git a/man2/signalfd.2 b/man2/signalfd.2 index 9af22b0..fba622c 100644 --- a/man2/signalfd.2 +++ b/man2/signalfd.2 @@ -3,7 +3,7 @@ .\" .\" SPDX-License-Identifier: GPL-2.0-or-later .\" -.TH signalfd 2 2023-05-03 "Linux man-pages 6.05.01" +.TH signalfd 2 2023-10-31 "Linux man-pages 6.7" .SH NAME signalfd \- create a file descriptor for accepting signals .SH LIBRARY @@ -12,7 +12,7 @@ Standard C library .SH SYNOPSIS .nf .B #include <sys/signalfd.h> -.PP +.P .BI "int signalfd(int " fd ", const sigset_t *" mask ", int " flags ); .fi .SH DESCRIPTION @@ -26,7 +26,7 @@ and has the advantage that the file descriptor may be monitored by .BR poll (2), and .BR epoll (7). -.PP +.P The .I mask argument specifies the set of signals that the caller @@ -46,7 +46,7 @@ or signals via a signalfd file descriptor; these signals are silently ignored if specified in .IR mask . -.PP +.P If the .I fd argument is \-1, @@ -60,7 +60,7 @@ is not \-1, then it must specify a valid existing signalfd file descriptor, and .I mask is used to replace the signal set associated with that file descriptor. -.PP +.P Starting with Linux 2.6.27, the following values may be bitwise ORed in .I flags to change the behavior of @@ -85,11 +85,11 @@ See the description of the flag in .BR open (2) for reasons why this may be useful. -.PP +.P Up to Linux 2.6.26, the .I flags argument is unused, and must be specified as zero. -.PP +.P .BR signalfd () returns a file descriptor that supports the following operations: .TP @@ -131,7 +131,11 @@ or fails with the error .B EAGAIN if the file descriptor has been made nonblocking. .TP -.BR poll "(2), " select "(2) (and similar)" +.BR poll (2) +.TQ +.BR select (2) +.TQ +(and similar) The file descriptor is readable (the .BR select (2) @@ -161,7 +165,7 @@ The format of the structure(s) returned by .BR read (2)s from a signalfd file descriptor is as follows: -.PP +.P .in +4n .EX struct signalfd_siginfo { @@ -192,7 +196,7 @@ struct signalfd_siginfo { }; .EE .in -.PP +.P Each of the fields in this structure is analogous to the similarly named field in the .I siginfo_t @@ -338,7 +342,7 @@ The glibc .BR signalfd () wrapper function does not include this argument, since it provides the required value for the underlying system call. -.PP +.P There are two underlying Linux system calls: .BR signalfd () and the more recent @@ -379,7 +383,7 @@ If a signal appears in the .I mask of more than one of the file descriptors, then occurrences of that signal can be read (once) from any one of the file descriptors. -.PP +.P Attempts to include .B SIGKILL and @@ -387,7 +391,7 @@ and in .I mask are silently ignored. -.PP +.P The signal mask employed by a signalfd file descriptor can be viewed via the entry for the corresponding file descriptor in the process's .IR /proc/ pid /fdinfo @@ -405,7 +409,7 @@ or the .B SIGFPE signal that results from an arithmetic error. Such signals can be caught only via signal handler. -.PP +.P As described above, in normal usage one blocks the signals that will be accepted via .BR signalfd (). @@ -443,7 +447,7 @@ The program terminates after accepting a .B SIGQUIT signal. The following shell session demonstrates the use of the program: -.PP +.P .in +4n .EX .RB "$" " ./signalfd_demo" |