man3/dlerror.3

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  25 .TH DLERROR 3 2017-09-15 "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 .PP
  31 .B "char *dlerror(void);"
  32 .PP
  33 Link with \fI\-ldl\fP.
  34 .SH DESCRIPTION
  35 The
  36 .BR dlerror ()
  37 function returns a human-readable,
  38 null-terminated string describing the most recent error
  39 that occurred from a call to one of the functions in the dlopen API
  40 since the last call to
  41 .BR dlerror ().
  42 The returned string does
  43 .I not
  44 include a trailing newline.
  45 .PP
  46 .BR dlerror ()
  47 returns NULL if no errors have occurred since initialization or since
  48 it was last called.
  49 .SH VERSIONS
  50 .BR dlerror ()
  51 is present in glibc 2.0 and later.
  52 .SH ATTRIBUTES
  53 For an explanation of the terms used in this section, see
  54 .BR attributes (7).
  55 .TS
  56 allbox;
  57 lb lb lb
  58 l l l.
  59 Interface       Attribute       Value
  60 T{
  61 .BR dlerror ()
  62 T}      Thread safety   MT-Safe
  63 .TE
  64 .SH CONFORMING TO
  65 POSIX.1-2001.
  66 .SH NOTES
  67 The message returned by
  68 .BR dlerror ()
  69 may reside in a statically allocated buffer that is
  70 overwritten by subsequent
  71 .BR dlerror ()
  72 calls.
  73 .\" .LP
  74 .\" The string returned by
  75 .\" .BR dlerror ()
  76 .\" should not be modified.
  77 .\" Some systems give the prototype as
  78 .\" .sp
  79 .\" .in +5
  80 .\" .B "const char *dlerror(void);"
  81 .\" .in
  82 .SS History
  83 This function is part of the dlopen API, derived from SunOS.
  84 .SH EXAMPLE
  85 See
  86 .BR dlopen (3).
  87 .SH SEE ALSO
  88 .BR dladdr (3),
  89 .BR dlinfo (3),
  90 .BR dlopen (3),
  91 .BR dlsym (3)