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getuid.3p (2794B)

    

  1. '\" et
  2. .TH GETUID "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
  3. .\"
  4. .SH PROLOG
  5. This manual page is part of the POSIX Programmer's Manual.
  6. The Linux implementation of this interface may differ (consult
  7. the corresponding Linux manual page for details of Linux behavior),
  8. or the interface may not be implemented on Linux.
  9. .\"
  10. .SH NAME
  11. getuid
  12. \(em get a real user ID
  13. .SH SYNOPSIS
  14. .LP
  15. .nf
  16. #include <unistd.h>
  17. .P
  18. uid_t getuid(void);
  19. .fi
  20. .SH DESCRIPTION
  21. The
  22. \fIgetuid\fR()
  23. function shall return the real user ID of the calling process.
  24. The
  25. \fIgetuid\fR()
  26. function shall not modify
  27. .IR errno .
  28. .SH "RETURN VALUE"
  29. The
  30. \fIgetuid\fR()
  31. function shall always be successful and no return value is reserved to
  32. indicate the error.
  33. .SH ERRORS
  34. No errors are defined.
  35. .LP
  36. .IR "The following sections are informative."
  37. .SH EXAMPLES
  38. .SS "Setting the Effective User ID to the Real User ID"
  39. .P
  40. The following example sets the effective user ID of the calling
  41. process to the real user ID.
  42. .sp
  43. .RS 4
  44. .nf
  46. #include <unistd.h>
  47. \&...
  48. seteuid(getuid());
  49. .fi
  50. .P
  51. .RE
  52. .SH "APPLICATION USAGE"
  53. None.
  54. .SH RATIONALE
  55. In a conforming environment,
  56. \fIgetuid\fR()
  57. will always succeed. It is possible for implementations to provide
  58. an extension where a process in a non-conforming environment
  59. will not be associated with a user or group ID. It is recommended
  60. that such implementations return (\c
  61. .BR uid_t )\-1
  62. and set
  63. .IR errno
  64. to indicate such an environment; doing so does not violate
  65. this standard, since such an environment is already an extension.
  66. .SH "FUTURE DIRECTIONS"
  67. None.
  68. .SH "SEE ALSO"
  69. .IR "\fIgetegid\fR\^(\|)",
  70. .IR "\fIgeteuid\fR\^(\|)",
  71. .IR "\fIgetgid\fR\^(\|)",
  72. .IR "\fIsetegid\fR\^(\|)",
  73. .IR "\fIseteuid\fR\^(\|)",
  74. .IR "\fIsetgid\fR\^(\|)",
  75. .IR "\fIsetregid\fR\^(\|)",
  76. .IR "\fIsetreuid\fR\^(\|)",
  77. .IR "\fIsetuid\fR\^(\|)"
  78. .P
  79. The Base Definitions volume of POSIX.1\(hy2017,
  80. .IR "\fB<sys_types.h>\fP",
  81. .IR "\fB<unistd.h>\fP"
  82. .\"
  83. .SH COPYRIGHT
  84. Portions of this text are reprinted and reproduced in electronic form
  85. from IEEE Std 1003.1-2017, Standard for Information Technology
  86. -- Portable Operating System Interface (POSIX), The Open Group Base
  87. Specifications Issue 7, 2018 Edition,
  88. Copyright (C) 2018 by the Institute of
  89. Electrical and Electronics Engineers, Inc and The Open Group.
  90. In the event of any discrepancy between this version and the original IEEE and
  91. The Open Group Standard, the original IEEE and The Open Group Standard
  92. is the referee document. The original Standard can be obtained online at
  93. http://www.opengroup.org/unix/online.html .
  94. .PP
  95. Any typographical or formatting errors that appear
  96. in this page are most likely
  97. to have been introduced during the conversion of the source files to
  98. man page format. To report such errors, see
  99. https://www.kernel.org/doc/man-pages/reporting_bugs.html .