mirror of https://github.com/mkerrisk/man-pages
Noted that ss_sp is automatically aligned by the kernel.
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@ -70,7 +70,7 @@ typedef struct {
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.RE
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.RE
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To establish a new alternate signal stack,
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To establish a new alternate signal stack,
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\fIss.ss_flags\fP is set to zero, and \fIss.sp_sp\fP and
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\fIss.ss_flags\fP is set to zero, and \fIss.ss_sp\fP and
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\fIss.ss_size\fP specify the starting address and size of
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\fIss.ss_size\fP specify the starting address and size of
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the stack.
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the stack.
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The constant \fBSIGSTKSZ\fP is defined to be large enough
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The constant \fBSIGSTKSZ\fP is defined to be large enough
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@ -78,6 +78,10 @@ to cover the usual size requirements for an alternate signal stack,
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and the constant \fBMINSIGSTKSZ\fP defines the minimum
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and the constant \fBMINSIGSTKSZ\fP defines the minimum
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size required to execute a signal handler.
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size required to execute a signal handler.
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When a signal handler is invoked on the alternate stack,
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the kernel automatically aligns the address given in \fIss.ss_sp\fP
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to a suitable address bundary for the underlying hardware architecture.
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To disable an existing stack, specify \fIss.ss_flags\fP
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To disable an existing stack, specify \fIss.ss_flags\fP
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as \fBSS_DISABLE\fP. In this case, the remaining fields
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as \fBSS_DISABLE\fP. In this case, the remaining fields
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in \fIss\fP are ignored.
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in \fIss\fP are ignored.
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@ -163,10 +167,10 @@ signal stack.
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.P
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.P
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\fBsigaltstack\fP() supersedes the older \fBsigstack\fP() call.
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\fBsigaltstack\fP() supersedes the older \fBsigstack\fP() call.
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For backwards compatibility, glibc also provides \fBsigstack\fP().
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For backwards compatibility, glibc also provides \fBsigstack\fP().
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All new applications should be written using \fBsigaltstack\fB().
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All new applications should be written using \fBsigaltstack\fP().
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.SH HISTORY
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.SH HISTORY
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4.2BSD had a \fIsigstack\fP() system call. It used a slightly
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4.2BSD had a \fIsigstack\fP() system call. It used a slightly
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different struct, and had as major disadvantage that the caller
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different struct, and had the major disadvantage that the caller
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had to know the direction of stack growth.
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had to know the direction of stack growth.
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.SH "CONFORMING TO"
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.SH "CONFORMING TO"
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SUSv2, SVr4, POSIX 1003.1-2001.
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SUSv2, SVr4, POSIX 1003.1-2001.
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