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Get the next entry from the password database
#include <sys/types.h>
#include <pwd.h>
int getpwent_r( struct passwd *pwd,
char *buffer,
size_t bufsize,
struct passwd **result);
- pwd
- A pointer to a passwd structure where the function
can store the entry.
- buffer
- A block of memory that the function can use to allocate storage
referenced by the passwd structure.
You can determine the maximum size needed for this buffer by calling
sysconf()
with an argument of _SC_GETPW_R_SIZE_MAX.
- bufsize
- The size of the block that buffer points to, in characters.
- result
- The address of a pointer to a passwd structure.
If getpwent_r() finds the next entry, it stores a
pointer to pwd in the location indicated by result;
otherwise the function stores a NULL pointer there.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The getpwent_r() function returns the next entry from the password
database.
It's similar to
getpwent(),
but getpwent_r() is reentrant.
0 on success or if the entry couldn't be found, or nonzero if an error
occurred
(errno
is set).
The getpwent_r() function uses the following functions, and as a
result,
errno
can be set to an error for any of these calls:
POSIX 1003.1 TSF
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
endpwent(),
errno,
getgrent(),
getlogin(),
getpwnam(),
getpwuid(),
setpwent()
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