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- .TH GETENV 2
- .SH NAME
- getenv, putenv \- access environment variables
- .SH SYNOPSIS
- .B #include <u.h>
- .br
- .B #include <libc.h>
- .PP
- .nf
- .B
- char* getenv(char *name)
- .br
- .B
- int putenv(char *name, char *val)
- .fi
- .SH DESCRIPTION
- .I Getenv
- reads the contents of
- .BI /env/ name
- (see
- .IR env (3))
- into memory allocated with
- .IR malloc (2),
- 0-terminates it,
- and returns a pointer to that area.
- If no file exists, 0
- is returned.
- .PP
- .I Putenv
- creates the file
- .BI /env/ name
- and writes the string
- .I val
- to it. The terminating
- .B 0
- is not written.
- If the file value cannot be written, \-1 is returned.
- .SH SOURCE
- .B /sys/src/libc/9sys
- .SH SEE ALSO
- .IR env (3)
- .SH DIAGNOSTICS
- Sets
- .IR errstr .
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