ref: b7a4dab54ab89f9cd62f3a31166cff553450cd28
dir: /sys/man/2/access/
.TH ACCESS 2 .SH NAME access \- determine accessibility of file .SH SYNOPSIS .B #include <u.h> .br .B #include <libc.h> .PP .B int access(char *name, int mode) .SH DESCRIPTION .I Access evaluates the given file .I name for accessibility. If \fImode\fL&4\fR is nonzero, read permission is expected; if \fImode\fL&2\fR, write permission; if \fImode\fL&1\fR, execute permission. If \fImode\fL==0\fR, the file merely need exist. In any case all directories leading to the file must permit searches. Zero is returned if the desired access is permitted, \-1 if not. .PP Only access for open is checked. A file may look executable, but .IR exec (2) will fail unless it is in proper format. .PP The include file .F <libc.h> defines .BR AEXIST =0, .BR AEXEC =1, .BR AWRITE =2, and .BR AREAD =4. .PP .SH SOURCE .B /sys/src/libc/9sys/access.c .SH SEE ALSO .IR stat (2) .SH DIAGNOSTICS Sets .IR errstr . .SH BUGS Since file permissions are checked by the server and group information is not known to the client, .I access must open the file to check permissions. (It calls .IR stat (2) to check simple existence.)