diff options
Diffstat (limited to '')
| -rw-r--r-- | man3/ctime.3 | 55 |
1 files changed, 27 insertions, 28 deletions
diff --git a/man3/ctime.3 b/man3/ctime.3 index 4dc72f2..817e964 100644 --- a/man3/ctime.3 +++ b/man3/ctime.3 @@ -13,7 +13,7 @@ .\" Modified 2001-12-13, joey, aeb .\" Modified 2004-11-16, mtk .\" -.TH ctime 3 2023-07-20 "Linux man-pages 6.05.01" +.TH ctime 3 2023-10-31 "Linux man-pages 6.7" .SH NAME asctime, ctime, gmtime, localtime, mktime, asctime_r, ctime_r, gmtime_r, localtime_r \- transform date and time to broken-down time or ASCII @@ -23,31 +23,31 @@ Standard C library .SH SYNOPSIS .nf .B #include <time.h> -.PP +.P .BI "char *asctime(const struct tm *" tm ); .BI "char *asctime_r(const struct tm *restrict " tm , .BI " char " buf "[restrict 26]);" -.PP +.P .BI "char *ctime(const time_t *" timep ); .BI "char *ctime_r(const time_t *restrict " timep , .BI " char " buf "[restrict 26]);" -.PP +.P .BI "struct tm *gmtime(const time_t *" timep ); .BI "struct tm *gmtime_r(const time_t *restrict " timep , .BI " struct tm *restrict " result ); -.PP +.P .BI "struct tm *localtime(const time_t *" timep ); .BI "struct tm *localtime_r(const time_t *restrict " timep , .BI " struct tm *restrict " result ); -.PP +.P .BI "time_t mktime(struct tm *" tm ); .fi -.PP +.P .RS -4 Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .RE -.PP +.P .BR asctime_r (), .BR ctime_r (), .BR gmtime_r (), @@ -66,7 +66,7 @@ functions all take an argument of data type \fItime_t\fP, which represents calendar time. When interpreted as an absolute time value, it represents the number of seconds elapsed since the Epoch, 1970-01-01 00:00:00 +0000 (UTC). -.PP +.P The .BR asctime () and @@ -74,25 +74,25 @@ and functions both take an argument representing broken-down time, which is a representation separated into year, month, day, and so on. -.PP +.P Broken-down time is stored in the structure .IR tm , described in .BR tm (3type). -.PP +.P The call .BI ctime( t ) is equivalent to .BI asctime(localtime( t )) \fR. It converts the calendar time \fIt\fP into a null-terminated string of the form -.PP +.P .in +4n .EX "Wed Jun 30 21:49:08 1993\en" .EE .in -.PP +.P The abbreviations for the days of the week are "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", and "Sat". The abbreviations for the months are "Jan", @@ -112,7 +112,7 @@ string in a user-supplied buffer which should have room for at least 26 bytes. It need not set \fItzname\fP, \fItimezone\fP, and \fIdaylight\fP. -.PP +.P The .BR gmtime () function converts the calendar time \fItimep\fP to @@ -125,7 +125,7 @@ The .BR gmtime_r () function does the same, but stores the data in a user-supplied struct. -.PP +.P The .BR localtime () function converts the calendar time \fItimep\fP to @@ -145,7 +145,7 @@ The function does the same, but stores the data in a user-supplied struct. It need not set \fItzname\fP, \fItimezone\fP, and \fIdaylight\fP. -.PP +.P The .BR asctime () function converts the broken-down time value @@ -157,7 +157,7 @@ The .BR asctime_r () function does the same, but stores the string in a user-supplied buffer which should have room for at least 26 bytes. -.PP +.P The .BR mktime () function converts a broken-down time structure, expressed @@ -182,7 +182,7 @@ and a negative value means that .BR mktime () should (use timezone information and system databases to) attempt to determine whether DST is in effect at the specified time. -.PP +.P The .BR mktime () function modifies the fields of the @@ -202,7 +202,7 @@ Calling .BR mktime () also sets the external variable \fItzname\fP with information about the current timezone. -.PP +.P If the specified broken-down time cannot be represented as calendar time (seconds since the Epoch), .BR mktime () @@ -217,33 +217,33 @@ and .BR localtime () return a pointer to a .IR "struct\ tm" . -.PP +.P On success, .BR gmtime_r () and .BR localtime_r () return the address of the structure pointed to by .IR result . -.PP +.P On success, .BR asctime () and .BR ctime () return a pointer to a string. -.PP +.P On success, .BR asctime_r () and .BR ctime_r () return a pointer to the string pointed to by .IR buf . -.PP +.P On success, .BR mktime () returns the calendar time (seconds since the Epoch), expressed as a value of type .IR time_t . -.PP +.P On error, .BR mktime () returns the value @@ -315,18 +315,17 @@ T} Thread safety T{ MT-Unsafe race:tmbuf env locale T} .TE -.sp 1 .SH VERSIONS POSIX doesn't specify the parameters of .BR ctime_r () to be .IR restrict ; that is specific to glibc. -.PP +.P In many implementations, including glibc, a 0 in .I tm_mday is interpreted as meaning the last day of the preceding month. -.PP +.P According to POSIX.1-2001, .BR localtime () is required to behave as though @@ -402,7 +401,7 @@ The thread-safe versions, and .BR localtime_r (), are specified by SUSv2. -.PP +.P POSIX.1-2001 says: "The .BR asctime (), |