2003-04-01 09:19:34 +02:00
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.\" Manual page created with latex2man on Mon Mar 31 14:18:02 PST 2003
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.\" NOTE: This file is generated, DO NOT EDIT.
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.de Vb
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.ft CW
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.nf
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..
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.de Ve
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.ft R
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.fi
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..
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.TH "UNW\\_GET\\_PROC\\_NAME" "3" "31 March 2003" "Programming Library " "Programming Library "
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.SH NAME
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unw_get_proc_name
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\-\- get name of current procedure
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.PP
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.SH SYNOPSIS
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.PP
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#include <libunwind.h>
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.br
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.PP
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int
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unw_get_proc_name(unw_cursor_t *cp,
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char *bufp,
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size_t
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len,
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unw_word_t *offp);
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.br
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.PP
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.SH DESCRIPTION
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.PP
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The unw_get_proc_name()
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routine returns the name of the
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procedure that created the stack frame identified by argument
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cp\&.
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The bufp
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argument is a pointer to a character buffer
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that is at least len
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bytes long. This buffer is used to return
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the name of the procedure. The offp
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argument is a pointer to a
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word that is used to return the byte\-offset of the instruction\-pointer
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saved in the stack frame identified by cp,
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relative to the start
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of the procedure. For example, if procedure foo()
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starts at
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address 0x40003000, then invoking unw_get_proc_name()
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on a
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stack frame with an instruction\-pointer value of 0x40003080 would
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return a value of 0x80 in the word pointed to by offp
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(assuming
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the procedure is at least 0x80 bytes long).
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.PP
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Note that on some platforms there is no reliable way to distinguish
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between procedure names and ordinary labels. Furthermore, if symbol
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information has been stripped from a program, procedure names may be
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completely unavailable or may be limited to those exported via a
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dynamic symbol table. In such cases, unw_get_proc_name()
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may return the name of a label or a preceeding (nearby) procedure.
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However, the offset returned through offp
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is always relative to
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the returned name, which ensures that the value (address) of the
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returned name plus the returned offset will always be equal to the
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instruction\-pointer of the stack frame identified by cp\&.
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.PP
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.SH RETURN VALUE
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.PP
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On successful completion, unw_get_proc_name()
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returns 0.
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Otherwise the negative value of one of the error\-codes below is
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returned.
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.PP
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.SH THREAD AND SIGNAL SAFETY
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.PP
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unw_get_proc_name()
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is thread\-safe but \fInot\fP
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safe to
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use from a signal handler.
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.PP
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.SH ERRORS
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.PP
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.TP
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UNW_EUNSPEC
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An unspecified error occurred.
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.TP
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UNW_ENOINFO
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Libunwind
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was unable to determine
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the name of the procedure.
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.TP
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UNW_ENOMME
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The procedure name is too long to fit
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in the buffer provided. A truncated version of the name has been
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returned.
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.PP
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In addition, unw_get_proc_name()
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may return any error
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returned by the access_mem()
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call\-back (see
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unw_create_addr_space(3)).
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.PP
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.SH SEE ALSO
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.PP
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libunwind(3),
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unw_get_proc_info(3)
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.PP
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.SH AUTHOR
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.PP
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David Mosberger\-Tang
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.br
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Hewlett\-Packard Labs
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.br
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Palo\-Alto, CA 94304
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.br
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Email: \fBdavidm@hpl.hp.com\fP
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.br
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WWW: \fBhttp://www.hpl.hp.com/research/linux/libunwind/\fP\&.
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.\" NOTE: This file is generated, DO NOT EDIT.
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