diff options
Diffstat (limited to 'man3/getlogin.3')
| -rw-r--r-- | man3/getlogin.3 | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/man3/getlogin.3 b/man3/getlogin.3 index 5b88d77..bdf8376 100644 --- a/man3/getlogin.3 +++ b/man3/getlogin.3 @@ -6,7 +6,7 @@ .\" Changed Tue Sep 19 01:49:29 1995, aeb: moved from man2 to man3 .\" added ref to /etc/utmp, added BUGS section, etc. .\" modified 2003 Walter Harms, aeb - added getlogin_r, note on stdin use -.TH getlogin 3 2023-07-20 "Linux man-pages 6.05.01" +.TH getlogin 3 2023-10-31 "Linux man-pages 6.7" .SH NAME getlogin, getlogin_r, cuserid \- get username .SH LIBRARY @@ -15,26 +15,26 @@ Standard C library .SH SYNOPSIS .nf .B #include <unistd.h> -.PP +.P .B "char *getlogin(void);" .BI "int getlogin_r(char " buf [. bufsize "], size_t " bufsize ); -.PP +.P .B #include <stdio.h> -.PP +.P .BI "char *cuserid(char *" string ); .fi -.PP +.P .RS -4 Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .RE -.PP +.P .BR getlogin_r (): .nf .\" Deprecated: _REENTRANT || _POSIX_C_SOURCE >= 199506L .fi -.PP +.P .BR cuserid (): .nf Since glibc 2.24: @@ -52,13 +52,13 @@ The string is statically allocated and might be overwritten on subsequent calls to this function or to .BR cuserid (). -.PP +.P .BR getlogin_r () returns this same username in the array .I buf of size .IR bufsize . -.PP +.P .BR cuserid () returns a pointer to a string containing a username associated with the effective user ID of the process. @@ -70,18 +70,18 @@ This string is statically allocated and might be overwritten on subsequent calls to this function or to .BR getlogin (). -.PP +.P The macro \fBL_cuserid\fP is an integer constant that indicates how long an array you might need to store a username. \fBL_cuserid\fP is declared in \fI<stdio.h>\fP. -.PP +.P These functions let your program identify positively the user who is running .RB ( cuserid ()) or the user who logged in this session .RB ( getlogin ()). (These can differ when set-user-ID programs are involved.) -.PP +.P For most purposes, it is more useful to use the environment variable \fBLOGNAME\fP to find out who the user is. This is more flexible @@ -111,7 +111,7 @@ The calling process has no controlling terminal. The length of the username, including the terminating null byte (\[aq]\e0\[aq]), is larger than .IR bufsize . -.PP +.P Linux/glibc also has: .TP .B ENOENT @@ -169,7 +169,7 @@ T} Thread safety T{ MT-Unsafe race:cuserid/!string locale T} .TE -.sp 1 +.P In the above table, .I utent in @@ -232,7 +232,7 @@ of our program need not be the user who started it. Avoid .BR getlogin () for security-related purposes. -.PP +.P Note that glibc does not follow the POSIX specification and uses .I stdin instead of @@ -242,7 +242,7 @@ A bug. all return the login name also when .I stdin is redirected.) -.PP +.P Nobody knows precisely what .BR cuserid () does; avoid it in portable programs. |