man3/dlerror.3

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  25 .TH DLERROR 3 2015-08-08 "Linux" "Linux Programmer's Manual"
  26 .SH NAME
  27 dlerror \- obtain error diagnostic for functions in the dlopen API
  28 .SH SYNOPSIS
  29 .B #include <dlfcn.h>
  30 .sp
  31 .B "char *dlerror(void);"
  32 .sp
  33 Link with \fI\-ldl\fP.
  34 .SH DESCRIPTION
  35 The
  36 .BR dlerror ()
  37 function returns a human-readable string describing the most recent error
  38 that occurred from a call to one of the functions in the dlopen API
  39 since the last call to
  40 .BR dlerror ().
  41 The returned string does
  42 .I not
  43 include a trailing newline.
  44
  45 .BR dlerror ()
  46 returns NULL if no errors have occurred since initialization or since
  47 it was last called.
  48 .SH VERSIONS
  49 .BR dlerror ()
  50 is present in glibc 2.0 and later.
  51 .SH ATTRIBUTES
  52 For an explanation of the terms used in this section, see
  53 .BR attributes (7).
  54 .TS
  55 allbox;
  56 lb lb lb
  57 l l l.
  58 Interface       Attribute       Value
  59 T{
  60 .BR dlerror ()
  61 T}      Thread safety   MT-Safe
  62 .TE
  63 .SH CONFORMING TO
  64 POSIX.1-2001.
  65 .SH NOTES
  66 The message returned by
  67 .BR dlerror ()
  68 may reside in a staticially allocated buffer that is
  69 overwritten by subsequent
  70 .BR dlerror ()
  71 calls.
  72 .\" .LP
  73 .\" The string returned by
  74 .\" .BR dlerror ()
  75 .\" should not be modified.
  76 .\" Some systems give the prototype as
  77 .\" .sp
  78 .\" .in +5
  79 .\" .B "const char *dlerror(void);"
  80 .\" .in
  81 .SS History
  82 This function is part of the dlopen API, derived from SunOS.
  83 .SH EXAMPLE
  84 See
  85 .BR dlopen (3).
  86 .SH SEE ALSO
  87 .BR dladdr (3),
  88 .BR dlinfo (3),
  89 .BR dlopen (3),
  90 .BR dlsym (3)