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comparison Python/pythonrun.c @ 73776:c86fb10eaf68

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Issue #7111: Python can now be run without a stdin, stdout or stderr stream. It was already the case with Python 2. However, the corresponding sys module entries are now set to None (instead of an unusable file object).
author Antoine Pitrou <solipsis@pitrou.net>
date Mon, 28 Nov 2011 19:09:45 +0100
parents 37300a1df7d7 f15943505db0
children 021e5bb297d1
comparison
equal deleted inserted replaced
73774:e3647275f468 73776:c86fb10eaf68
910 Py_XDECREF(text); 910 Py_XDECREF(text);
911 Py_XDECREF(raw); 911 Py_XDECREF(raw);
912 return NULL; 912 return NULL;
913 } 913 }
914 914
915 static int
916 is_valid_fd(int fd)
917 {
918 int dummy_fd;
919 if (fd < 0 || !_PyVerify_fd(fd))
920 return 0;
921 dummy_fd = dup(fd);
922 if (dummy_fd < 0)
923 return 0;
924 close(dummy_fd);
925 return 1;
926 }
927
915 /* Initialize sys.stdin, stdout, stderr and builtins.open */ 928 /* Initialize sys.stdin, stdout, stderr and builtins.open */
916 static int 929 static int
917 initstdio(void) 930 initstdio(void)
918 { 931 {
919 PyObject *iomod = NULL, *wrapper; 932 PyObject *iomod = NULL, *wrapper;
969 fd = fileno(stdin); 982 fd = fileno(stdin);
970 /* Under some conditions stdin, stdout and stderr may not be connected 983 /* Under some conditions stdin, stdout and stderr may not be connected
971 * and fileno() may point to an invalid file descriptor. For example 984 * and fileno() may point to an invalid file descriptor. For example
972 * GUI apps don't have valid standard streams by default. 985 * GUI apps don't have valid standard streams by default.
973 */ 986 */
974 if (fd < 0) { 987 if (!is_valid_fd(fd)) {
975 #ifdef MS_WINDOWS
976 std = Py_None; 988 std = Py_None;
977 Py_INCREF(std); 989 Py_INCREF(std);
978 #else
979 goto error;
980 #endif
981 } 990 }
982 else { 991 else {
983 std = create_stdio(iomod, fd, 0, "<stdin>", encoding, errors); 992 std = create_stdio(iomod, fd, 0, "<stdin>", encoding, errors);
984 if (std == NULL) 993 if (std == NULL)
985 goto error; 994 goto error;
988 PySys_SetObject("stdin", std); 997 PySys_SetObject("stdin", std);
989 Py_DECREF(std); 998 Py_DECREF(std);
990 999
991 /* Set sys.stdout */ 1000 /* Set sys.stdout */
992 fd = fileno(stdout); 1001 fd = fileno(stdout);
993 if (fd < 0) { 1002 if (!is_valid_fd(fd)) {
994 #ifdef MS_WINDOWS
995 std = Py_None; 1003 std = Py_None;
996 Py_INCREF(std); 1004 Py_INCREF(std);
997 #else
998 goto error;
999 #endif
1000 } 1005 }
1001 else { 1006 else {
1002 std = create_stdio(iomod, fd, 1, "<stdout>", encoding, errors); 1007 std = create_stdio(iomod, fd, 1, "<stdout>", encoding, errors);
1003 if (std == NULL) 1008 if (std == NULL)
1004 goto error; 1009 goto error;
1008 Py_DECREF(std); 1013 Py_DECREF(std);
1009 1014
1010 #if 1 /* Disable this if you have trouble debugging bootstrap stuff */ 1015 #if 1 /* Disable this if you have trouble debugging bootstrap stuff */
1011 /* Set sys.stderr, replaces the preliminary stderr */ 1016 /* Set sys.stderr, replaces the preliminary stderr */
1012 fd = fileno(stderr); 1017 fd = fileno(stderr);
1013 if (fd < 0) { 1018 if (!is_valid_fd(fd)) {
1014 #ifdef MS_WINDOWS
1015 std = Py_None; 1019 std = Py_None;
1016 Py_INCREF(std); 1020 Py_INCREF(std);
1017 #else
1018 goto error;
1019 #endif
1020 } 1021 }
1021 else { 1022 else {
1022 std = create_stdio(iomod, fd, 1, "<stderr>", encoding, "backslashreplace"); 1023 std = create_stdio(iomod, fd, 1, "<stderr>", encoding, "backslashreplace");
1023 if (std == NULL) 1024 if (std == NULL)
1024 goto error; 1025 goto error;