Merging upstream version 6.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 311 deletions

diff --git a/man3/exec.3 b/man3/exec.3
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-'\" t
-.\" Copyright (c) 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" SPDX-License-Identifier: BSD-4-Clause-UC
-.\"
-.\"     @(#)exec.3	6.4 (Berkeley) 4/19/91
-.\"
-.\" Converted for Linux, Mon Nov 29 11:12:48 1993, faith@cs.unc.edu
-.\" Updated more for Linux, Tue Jul 15 11:54:18 1997, pacman@cqc.com
-.\" Modified, 24 Jun 2004, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"     Added note on casting NULL
-.\"
-.TH exec 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-execl, execlp, execle, execv, execvp, execvpe \- execute a file
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.B extern char **environ;
-.P
-.BI "int execl(const char *" pathname ", const char *" arg ", ..."
-.B  "                /*, (char *) NULL */);"
-.BI "int execlp(const char *" file ", const char *" arg ", ..."
-.B  "                /*, (char *) NULL */);"
-.BI "int execle(const char *" pathname ", const char *" arg ", ..."
-.BI "                /*, (char *) NULL, char *const " envp "[] */);"
-.BI "int execv(const char *" pathname ", char *const " argv "[]);"
-.BI "int execvp(const char *" file ", char *const " argv "[]);"
-.BI "int execvpe(const char *" file ", char *const " argv \
-"[], char *const " envp "[]);"
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR execvpe ():
-.nf
-    _GNU_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR exec ()
-family of functions replaces the current process image with a new process
-image.
-The functions described in this manual page are layered on top of
-.BR execve (2).
-(See the manual page for
-.BR execve (2)
-for further details about the replacement of the current process image.)
-.P
-The initial argument for these functions is the name of a file that is
-to be executed.
-.P
-The functions can be grouped based on the letters following the "exec" prefix.
-.\"
-.SS l - execl(), execlp(), execle()
-The
-.I "const char\ *arg"
-and subsequent ellipses can be thought of as
-.IR arg0 ,
-.IR arg1 ,
-\&...,
-.IR argn .
-Together they describe a list of one or more pointers to null-terminated
-strings that represent the argument list available to the executed program.
-The first argument, by convention, should point to the filename associated
-with the file being executed.
-The list of arguments
-.I must
-be terminated by a null pointer,
-and, since these are variadic functions, this pointer must be cast
-.IR "(char\ *) NULL" .
-.P
-By contrast with the 'l' functions, the 'v' functions (below) specify the
-command-line arguments of the executed program as a vector.
-.\"
-.SS v - execv(), execvp(), execvpe()
-The
-.I "char\ *const argv[]"
-argument is an array of pointers to null-terminated strings that
-represent the argument list available to the new program.
-The first argument, by convention, should point to the filename
-associated with the file being executed.
-The array of pointers
-.I must
-be terminated by a null pointer.
-.SS e - execle(), execvpe()
-The environment of the new process image is specified via the argument
-.IR envp .
-The
-.I envp
-argument is an array of pointers to null-terminated strings and
-.I must
-be terminated by a null pointer.
-.P
-All other
-.BR exec ()
-functions (which do not include 'e' in the suffix)
-take the environment for the new process
-image from the external variable
-.I environ
-in the calling process.
-.SS p - execlp(), execvp(), execvpe()
-These functions duplicate the actions of the shell in
-searching for an executable file
-if the specified filename does not contain a slash (/) character.
-The file is sought in the colon-separated list of directory pathnames
-specified in the
-.B PATH
-environment variable.
-If this variable isn't defined, the path list defaults to
-a list that includes the directories returned by
-.I confstr(_CS_PATH)
-(which typically returns the value "/bin:/usr/bin")
-and possibly also the current working directory;
-see NOTES for further details.
-.P
-.BR execvpe ()
-searches for the program using the value of
-.B PATH
-from the caller's environment, not from the
-.I envp
-argument.
-.P
-If the specified filename includes a slash character, then
-.B PATH
-is ignored, and the file at the specified pathname is executed.
-.P
-In addition, certain errors are treated specially.
-.P
-If permission is denied for a file (the attempted
-.BR execve (2)
-failed with the error
-.BR EACCES ),
-these functions will continue searching the rest of the search path.
-If no other file is found, however,
-they will return with
-.I errno
-set to
-.BR EACCES .
-.P
-If the header of a file isn't recognized (the attempted
-.BR execve (2)
-failed with the error
-.BR ENOEXEC ),
-these functions will execute the shell
-.RI ( /bin/sh )
-with the path of the file as its first argument.
-(If this attempt fails, no further searching is done.)
-.P
-All other
-.BR exec ()
-functions (which do not include 'p' in the suffix)
-take as their first argument a (relative or absolute) pathname
-that identifies the program to be executed.
-.SH RETURN VALUE
-The
-.BR exec ()
-functions return only if an error has occurred.
-The return value is \-1, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-All of these functions may fail and set
-.I errno
-for any of the errors specified for
-.BR execve (2).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR execl (),
-.BR execle (),
-.BR execv ()
-T}	Thread safety	MT-Safe
-T{
-.na
-.nh
-.BR execlp (),
-.BR execvp (),
-.BR execvpe ()
-T}	Thread safety	MT-Safe env
-.TE
-.SH VERSIONS
-The default search path (used when the environment
-does not contain the variable \fBPATH\fR)
-shows some variation across systems.
-It generally includes
-.I /bin
-and
-.I /usr/bin
-(in that order) and may also include the current working directory.
-On some other systems, the current working is included after
-.I /bin
-and
-.IR /usr/bin ,
-as an anti-Trojan-horse measure.
-The glibc implementation long followed the traditional default where
-the current working directory is included at the start of the search path.
-However, some code refactoring during the development of glibc 2.24
-.\" glibc commit 1eb8930608705702d5746e5491bab4e4429fcb83
-caused the current working directory to be dropped altogether
-from the default search path.
-This accidental behavior change is considered mildly beneficial,
-and won't be reverted.
-.P
-The behavior of
-.BR execlp ()
-and
-.BR execvp ()
-when errors occur while attempting to execute the file is historic
-practice, but has not traditionally been documented and is not specified by
-the POSIX standard.
-BSD (and possibly other systems) do an automatic
-sleep and retry if
-.B ETXTBSY
-is encountered.
-Linux treats it as a hard
-error and returns immediately.
-.P
-Traditionally, the functions
-.BR execlp ()
-and
-.BR execvp ()
-ignored all errors except for the ones described above and
-.B ENOMEM
-and
-.BR E2BIG ,
-upon which they returned.
-They now return if any error other than the ones
-described above occurs.
-.SH STANDARDS
-.TP
-.B environ
-.TQ
-.BR execl ()
-.TQ
-.BR execlp ()
-.TQ
-.BR execle ()
-.TQ
-.BR execv ()
-.TQ
-.BR execvp ()
-POSIX.1-2008.
-.TP
-.BR execvpe ()
-GNU.
-.SH HISTORY
-.TP
-.B environ
-.TQ
-.BR execl ()
-.TQ
-.BR execlp ()
-.TQ
-.BR execle ()
-.TQ
-.BR execv ()
-.TQ
-.BR execvp ()
-POSIX.1-2001.
-.TP
-.BR execvpe ()
-glibc 2.11.
-.SH BUGS
-Before glibc 2.24,
-.BR execl ()
-and
-.BR execle ()
-employed
-.BR realloc (3)
-internally and were consequently not async-signal-safe,
-in violation of the requirements of POSIX.1.
-.\" https://sourceware.org/bugzilla/show_bug.cgi?id=19534
-This was fixed in glibc 2.24.
-.\"
-.SS Architecture-specific details
-On sparc and sparc64,
-.BR execv ()
-is provided as a system call by the kernel
-(with the prototype shown above)
-for compatibility with SunOS.
-This function is
-.I not
-employed by the
-.BR execv ()
-wrapper function on those architectures.
-.SH SEE ALSO
-.BR sh (1),
-.BR execve (2),
-.BR execveat (2),
-.BR fork (2),
-.BR ptrace (2),
-.BR fexecve (3),
-.BR system (3),
-.BR environ (7)