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creat.3p (2781B)

    

  1. '\" et
  2. .TH CREAT "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. creat
  12. \(em create a new file or rewrite an existing one
  13. .SH SYNOPSIS
  14. .LP
  15. .nf
  16. #include <sys/stat.h>
  17. #include <fcntl.h>
  18. .P
  19. int creat(const char *\fIpath\fP, mode_t \fImode\fP);
  20. .fi
  21. .SH DESCRIPTION
  22. The
  23. \fIcreat\fR()
  24. function shall behave as if it is implemented as follows:
  25. .sp
  26. .RS 4
  27. .nf
  29. int creat(const char *path, mode_t mode)
  30. {
  31.     return open(path, O_WRONLY|O_CREAT|O_TRUNC, mode);
  32. }
  33. .fi
  34. .P
  35. .RE
  36. .SH "RETURN VALUE"
  37. Refer to
  38. .IR "\fIopen\fR\^(\|)".
  39. .SH ERRORS
  40. Refer to
  41. .IR "\fIopen\fR\^(\|)".
  42. .LP
  43. .IR "The following sections are informative."
  44. .SH EXAMPLES
  45. .SS "Creating a File"
  46. .P
  47. The following example creates the file
  48. .BR /tmp/file
  49. with read and write permissions for the file owner and read permission
  50. for group and others. The resulting file descriptor is assigned to the
  51. .IR fd
  52. variable.
  53. .sp
  54. .RS 4
  55. .nf
  57. #include <fcntl.h>
  58. \&...
  59. int fd;
  60. mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
  61. char *pathname = "/tmp/file";
  62. \&...
  63. fd = creat(pathname, mode);
  64. \&...
  65. .fi
  66. .P
  67. .RE
  68. .SH "APPLICATION USAGE"
  69. None.
  70. .SH RATIONALE
  71. The
  72. \fIcreat\fR()
  73. function is redundant. Its services are also provided by the
  74. \fIopen\fR()
  75. function. It has been included primarily for historical purposes since
  76. many existing applications depend on it. It is best considered a part
  77. of the C binding rather than a function that should be provided in
  78. other languages.
  79. .SH "FUTURE DIRECTIONS"
  80. None.
  81. .SH "SEE ALSO"
  82. .IR "\fImknod\fR\^(\|)",
  83. .IR "\fIopen\fR\^(\|)"
  84. .P
  85. The Base Definitions volume of POSIX.1\(hy2017,
  86. .IR "\fB<fcntl.h>\fP",
  87. .IR "\fB<sys_stat.h>\fP",
  88. .IR "\fB<sys_types.h>\fP"
  89. .\"
  90. .SH COPYRIGHT
  91. Portions of this text are reprinted and reproduced in electronic form
  92. from IEEE Std 1003.1-2017, Standard for Information Technology
  93. -- Portable Operating System Interface (POSIX), The Open Group Base
  94. Specifications Issue 7, 2018 Edition,
  95. Copyright (C) 2018 by the Institute of
  96. Electrical and Electronics Engineers, Inc and The Open Group.
  97. In the event of any discrepancy between this version and the original IEEE and
  98. The Open Group Standard, the original IEEE and The Open Group Standard
  99. is the referee document. The original Standard can be obtained online at
  100. http://www.opengroup.org/unix/online.html .
  101. .PP
  102. Any typographical or formatting errors that appear
  103. in this page are most likely
  104. to have been introduced during the conversion of the source files to
  105. man page format. To report such errors, see
  106. https://www.kernel.org/doc/man-pages/reporting_bugs.html .