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CONFSTR(3) BSD Library Functions Manual CONFSTR(3) NAME confstr -- get string-valued configurable variables LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <unistd.h> size_t confstr(int name, char *buf, size_t len); DESCRIPTION This interface is specified by IEEE Std 1003.1-2001 ("POSIX.1"). A more flexible (but non-portable) interface is provided by sysctl(3). The confstr() function provides a method for applications to get configu- ration defined string values. Shell programmers needing access to these parameters should use the getconf(1) utility. The name argument specifies the system variable to be queried. Symbolic constants for each name value are found in the include file <unistd.h>. The len argument specifies the size of the buffer referenced by the argu- ment buf. If len is non-zero, buf is a non-null pointer, and name has a value, up to len - 1 bytes of the value are copied into the buffer buf. The copied value is always null terminated. The available values are as follows: _CS_PATH Return a value for the PATH environment variable that finds all the standard utilities. RETURN VALUES If the call to confstr() is not successful, 0 is returned and errno is set appropriately. Otherwise, if the variable does not have a configura- tion defined value, 0 is returned and errno is not modified. Otherwise, the buffer size needed to hold the entire configuration-defined value is returned. If this size is greater than the argument len, the string in buf was truncated. ERRORS The confstr() function may fail and set errno for any of the errors spec- ified for the library functions malloc(3) and sysctl(3). In addition, the following errors may be reported: [EINVAL] The value of the name argument is invalid. SEE ALSO getconf(1), pathconf(2), sysconf(3), sysctl(3) HISTORY The confstr() function first appeared in 4.4BSD. BSD December 3, 2006 BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY
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