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signal.7: Summarize 2.2 system call changes that resulted from larger signal sets 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2015-02-18 21:25:41 +01:00
parent 373ed9ba91
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@ -446,6 +446,26 @@ resource limit, which specifies a per-user limit for queued
signals; see
.BR setrlimit (2)
for further details.
The addition or real-time signals required the widening
of the signal set structure
.RI ( sigset_t )
from 32 to 64 bits.
Consequently, various system calls were superseded by new system calls
that supported the larger signal sets.
The old and new system calls are as follows:
.TS
lb lb
l l.
Linux 2.0 and earlier Linux 2.2 and later
\fBsigaction\fP(2) \fBrt_sigaction\fP(2)
\fBsigpending\fP(2) \fBrt_sigpending\fP(2)
\fBsigprocmask\fP(2) \fBrt_sigprocmask\fP(2)
\fBsigreturn\fP(2) \fBrt_sigreturn\fP(2)
\fBsigsuspend\fP(2) \fBrt_sigsuspend\fP(2)
\fBsigtimedwait\fP(2) \fBrt_sigtimedwait\fP(2)
.TE
.\"
.SS Async-signal-safe functions
.PP
A signal handler function must be very careful,