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Diffstat (limited to 'man5/proc_pid_environ.5')
| -rw-r--r-- | man5/proc_pid_environ.5 | 48 |
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diff --git a/man5/proc_pid_environ.5 b/man5/proc_pid_environ.5 new file mode 100644 index 0000000..104cbe0 --- /dev/null +++ b/man5/proc_pid_environ.5 @@ -0,0 +1,48 @@ +.\" Copyright (C) 1994, 1995, Daniel Quinlan <quinlan@yggdrasil.com> +.\" Copyright (C) 2002-2008, 2017, Michael Kerrisk <mtk.manpages@gmail.com> +.\" Copyright (C) 2023, Alejandro Colomar <alx@kernel.org> +.\" +.\" SPDX-License-Identifier: GPL-3.0-or-later +.\" +.TH proc_pid_environ 5 2023-08-15 "Linux man-pages 6.7" +.SH NAME +/proc/pid/environ \- initial environment +.SH DESCRIPTION +.TP +.IR /proc/ pid /environ +This file contains the initial environment that was set +when the currently executing program was started via +.BR execve (2). +The entries are separated by null bytes (\[aq]\e0\[aq]), +and there may be a null byte at the end. +Thus, to print out the environment of process 1, you would do: +.IP +.in +4n +.EX +.RB "$" " cat /proc/1/environ | tr \[aq]\e000\[aq] \[aq]\en\[aq]" +.EE +.in +.IP +If, after an +.BR execve (2), +the process modifies its environment +(e.g., by calling functions such as +.BR putenv (3) +or modifying the +.BR environ (7) +variable directly), +this file will +.I not +reflect those changes. +.IP +Furthermore, a process may change the memory location that this file refers via +.BR prctl (2) +operations such as +.BR PR_SET_MM_ENV_START . +.IP +Permission to access this file is governed by a ptrace access mode +.B PTRACE_MODE_READ_FSCREDS +check; see +.BR ptrace (2). +.SH SEE ALSO +.BR proc (5) |