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+'\" et
+.TH SHMAT "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+
+.SH NAME
+shmat
+\(em XSI shared memory attach operation
+.SH SYNOPSIS
+.LP
+.nf
+#include <sys/shm.h>
+.P
+void *shmat(int \fIshmid\fP, const void *\fIshmaddr\fP, int \fIshmflg\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIshmat\fR()
+function operates on XSI shared memory (see the Base Definitions volume of POSIX.1\(hy2008,
+.IR "Section 3.342" ", " "Shared Memory Object").
+It is unspecified whether this function interoperates with the
+realtime interprocess communication facilities defined in
+.IR "Section 2.8" ", " "Realtime".
+.P
+The
+\fIshmat\fR()
+function attaches the shared memory segment associated with the shared
+memory identifier specified by
+.IR shmid
+to the address space of the calling process. The segment is attached
+at the address specified by one of the following criteria:
+.IP " *" 4
+If
+.IR shmaddr
+is a null pointer, the segment is attached at the first available
+address as selected by the system.
+.IP " *" 4
+If
+.IR shmaddr
+is not a null pointer and (\fIshmflg\fP &SHM_RND)
+is non-zero, the segment is attached at the address given by
+(\fIshmaddr\fP \(mi((\fIuintptr_t\fP)\fIshmaddr\fP %SHMLBA)). The
+character
+.BR '%' 
+is the C-language remainder operator.
+.IP " *" 4
+If
+.IR shmaddr
+is not a null pointer and (\fIshmflg\fP &SHM_RND) is 0, the segment is
+attached at the address given by
+.IR shmaddr .
+.IP " *" 4
+The segment is attached for reading if (\fIshmflg\fP &SHM_RDONLY)
+is non-zero and the calling process has read permission; otherwise, if
+it is 0 and the calling process has read and write permission, the
+segment is attached for reading and writing.
+.SH "RETURN VALUE"
+Upon successful completion,
+\fIshmat\fR()
+shall increment the value of
+.IR shm_nattch
+in the data structure associated with the shared memory ID of the
+attached shared memory segment and return the segment's start address.
+Also, the
+.IR shm_atime
+timestamp shall be set to the current time, as described in
+.IR "Section 2.7.1" ", " "IPC General Description".
+.P
+Otherwise, the shared memory segment shall not be attached,
+\fIshmat\fR()
+shall return \(mi1, and
+.IR errno
+shall be set to indicate the error.
+.SH ERRORS
+The
+\fIshmat\fR()
+function shall fail if:
+.TP
+.BR EACCES
+Operation permission is denied to the calling process; see
+.IR "Section 2.7" ", " "XSI Interprocess Communication".
+.TP
+.BR EINVAL
+The value of
+.IR shmid
+is not a valid shared memory identifier, the
+.IR shmaddr
+is not a null pointer, and the value of
+(\fIshmaddr\fP \(mi((\fIuintptr_t\fP)\fIshmaddr\fP %SHMLBA))
+is an illegal address for attaching shared memory; or the
+.IR shmaddr
+is not a null pointer, (\fIshmflg\fP &SHM_RND) is 0, and the value of
+.IR shmaddr
+is an illegal address for attaching shared memory.
+.TP
+.BR EMFILE
+The number of shared memory segments attached to the calling process
+would exceed the system-imposed limit.
+.TP
+.BR ENOMEM
+The available data space is not large enough to accommodate the shared
+memory segment.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+The POSIX Realtime Extension defines alternative interfaces for interprocess
+communication. Application developers who need to use IPC should
+design their applications so that modules using the IPC routines
+described in
+.IR "Section 2.7" ", " "XSI Interprocess Communication"
+can be easily modified to use the alternative interfaces.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Section 2.7" ", " "XSI Interprocess Communication",
+.IR "Section 2.8" ", " "Realtime",
+.IR "\fIexec\fR\^",
+.IR "\fIexit\fR\^(\|)",
+.IR "\fIfork\fR\^(\|)",
+.IR "\fIshmctl\fR\^(\|)",
+.IR "\fIshmdt\fR\^(\|)",
+.IR "\fIshmget\fR\^(\|)",
+.IR "\fIshm_open\fR\^(\|)",
+.IR "\fIshm_unlink\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2008,
+.IR "Section 3.342" ", " "Shared Memory Object",
+.IR "\fB<sys_shm.h>\fP"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, Copyright (C) 2013 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.unix.org/online.html .
+
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .