projects / thirdparty / man-pages.git / blame
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1 | .\" Copyright (c) 2020-2022 by Alejandro Colomar <colomar.6.4.3@gmail.com> |
| 2 | .\" and Copyright (c) 2020 by Michael Kerrisk <mtk.manpages@gmail.com> | |
| 3 | .\" | |
| 4 | .\" SPDX-License-Identifier: Linux-man-pages-copyleft | |
| 5 | .\" | |
| 6 | .\" | |
| 7 | .TH TIME_T 3type 2022-07-20 Linux "Linux Programmer's Manual" | |
| 8 | .SH NAME | |
| 9 | time_t, suseconds_t, useconds_t \- integer time | |
| 10 | .SH LIBRARY | |
| 11 | Standard C library | |
| 12 | .RI ( libc ) | |
| 13 | .SH SYNOPSIS | |
| 14 | .nf | |
| 15 | .B #include <time.h> | |
| 16 | .PP | |
| 17 | .BR typedef " /* ... */ " time_t; | |
| 18 | .PP | |
| 19 | .B #include <sys/types.h> | |
| 20 | .PP | |
| 21 | .BR typedef " /* ... */ " suseconds_t; | |
| 22 | .BR typedef " /* ... */ " useconds_t; | |
| 23 | .fi | |
| 24 | .SH DESCRIPTION | |
| 25 | .TP | |
| 26 | .I time_t | |
| 27 | Used for time in seconds. | |
| 28 | According to POSIX, | |
| 29 | it shall be an integer type. | |
| 30 | .\" In POSIX.1-2001, the type was specified as being either an integer | |
| 31 | .\" type or a real-floating type. However, existing implementations | |
| 32 | .\" used an integer type, and POSIX.1-2008 tightened the specification | |
| 33 | .\" to reflect this. | |
| 34 | .TP | |
| 35 | .I suseconds_t | |
| 36 | Used for time in microseconds. | |
| 37 | According to POSIX, | |
| 38 | it shall be a signed integer type | |
| 39 | capable of storing values al least in the range | |
| 40 | .RB [ \-1 , | |
| 41 | .BR 1000000 ]. | |
| 42 | .TP | |
| 43 | .I useconds_t | |
| 44 | Used for time in microseconds. | |
| 45 | According to POSIX, | |
| 46 | it shall be an unsigned integer type | |
| 47 | capable of storing values al least in the range | |
| 48 | .RB [ 0 , | |
| 49 | .BR 1000000 ]. | |
| 50 | .PP | |
| 51 | According to POSIX, | |
| 52 | the implementation shall support one or more programming environments | |
| 53 | where the width of | |
| 54 | .I suseconds_t | |
| 55 | and | |
| 56 | .I useconds_t | |
| 57 | is no greater than the width of the type | |
| 58 | .IR long . | |
| 59 | .SH VERSIONS | |
| 60 | .TP | |
| 61 | .I time_t | |
| 62 | .I <sched.h> | |
| 63 | defines | |
| 64 | .I time_t | |
| 65 | since POSIX.1-2008. | |
| 66 | .TP | |
| 67 | .I suseconds_t | |
| 68 | POSIX.1-2001 defined | |
| 69 | .I useconds_t | |
| 70 | in | |
| 71 | .I <unistd.h> | |
| 72 | too. | |
| 73 | .SH CONFORMING TO | |
| 74 | .PD 0 | |
| 75 | .IR time_t : | |
| 76 | C99 and later. | |
| 77 | POSIX.1-2001 and later. | |
| 78 | .PP | |
| 79 | .IR suseconds_t : | |
| 80 | POSIX.1-2001 and later. | |
| 81 | .PP | |
| 82 | .IR useconds_t : | |
| 83 | POSIX.1-2001 and later. | |
| 84 | .PD | |
| 85 | .SH NOTES | |
| 86 | .TP | |
| 87 | .I time_t | |
| 88 | The following headers also provide | |
| 89 | .IR time_t : | |
| 90 | .IR <sched.h> , | |
| 91 | .IR <sys/msg.h> , | |
| 92 | .IR <sys/select.h> , | |
| 93 | .IR <sys/sem.h> , | |
| 94 | .IR <sys/shm.h> , | |
| 95 | .IR <sys/stat.h> , | |
| 96 | .IR <sys/time.h> , | |
| 97 | .IR <sys/types.h> , | |
| 98 | and | |
| 99 | .IR <utime.h> . | |
| 100 | .TP | |
| 101 | .I suseconds_t | |
| 102 | The following headers also provide | |
| 103 | .IR suseconds_t : | |
| 104 | .I <sys/select.h> | |
| 105 | and | |
| 106 | .IR <sys/time.h> . | |
| 107 | .SH SEE ALSO | |
| 108 | .BR stime (2), | |
| 109 | .BR time (2), | |
| 110 | .BR ctime (3), | |
| 111 | .BR difftime (3), | |
| 112 | .BR usleep (3), | |
| 113 | .BR timeval (3type) |